Tribology and Materials

The topic Tribology and Materials focuses on the study of damage to materials caused by various loadings. Damage can be located within parts (plasticity, fracture, fatigue), and on their surfaces (friction, wear, cracking and other tribological features). The solicitations studied can be severe (pressure, velocity, temperature, hygrometry) under both dynamic and static loads. Different types of materials are studied : metals, composites (organic and metallic matrixes), ceramics, elastomers and polymers. The phenomenon of fatigue is a recurrent element of research in the Tribology and Materials topic. This principle of accumulation of damage under dynamic loading can be manifested by destruction inside (volume fatigue) and on the surface (surface fatigue, involved in fretting-fatigue and micro-scaling) of the material. These phenomena are studied by modelling and experimental works performed on original test benches developed in the laboratory.

The purpose of studying microgeometry is to place the properties of materials at the centre of the tribological performances of contacts and bonded multi-material assemblies. The research seeks to understand the phenomena induced locally by the specific characteristics of the surfaces of parts. One of the particularities of functional surfaces is their roughness, characterised by micrometric variations in altitude, making the contact between two parts discontinuous and stochastic by nature. It is also necessary to take into account differences in the nature and properties between the materials on the surface and at the core of the parts in contact.

Lastly, this research is enriched by damage analysis aimed at linking the damage to the microstructures observable at different scales in the material. Damage can be caused by various types of mechanical sollicitations (traction, torsion, bending, impact, crash-test, etc.) and heat (e.g., welding). This activity is completed by the development of fabrication processes, such as powder metallurgy, RTM and other techniques excluding autoclaves, that makes it possible to optimise materials properties and take into account environmental aspects, for example, by using cutting scrap (metal chips, polymers, elastomers) in the composition of the materials so formed.

TOPIC MANAGER

Tony DA SILVA BOTELHO (PU) - ISAE-Supméca
tony.dasilva@isae-supmeca.fr

OUR ACTIVITIES FOCUS ON

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The word “fretting” describes both specific tribological conditions (vibrationsunder low amplitude motion leading to the limited sliding of interfaces so that a fraction of the surfaces always remains in contact) and the resulting damage. This can involve combinations of elementary mechanisms like wear (abrasion, seizing, etc.) and contact fatigue (crack initiation, scaling, delamination, etc.).

This research activity focuses on the experimental study of damage phenomena by pure fretting, without coupling with the volume fatigue loading of the samples. The fretting-fatigue and fretting-wear solicitations are simulated experimentally to study the performances of metallic substrates and composites, and to characterise damage mitigation solutions (surface and coating treatments).

Two dedicated test devices (Vibro-Cryo-TriboMeter and Vibro-Thermo-TriboMeter) allow covering a wide range of thermal conditions (cryogenic temperatures in a liquid nitrogen bath, up to 600°C with pulsed air). A parallel hygrometric test can also be performed using a mobile external climatic test chamber.

The sample holders and test setting systems are specifically designed to study contact surface situations (plane/plane or other conformal contact geometries).

This problem is approached in several ways :

     (i) Local analyses of damage,

     (ii) Characterisation of contact stiffness,

     (iii) Characterisation of the evolution of damping due to dry friction.

Local analysis of damage

The estimation of wear and understanding of damage phenomena requires local approaches, in particular for studying rough surfaces in surface configurations. Movements of materials and surface changes are of a magnitude close to or lower than the original surfaces roughnesses.

Setting up 3D topographical analysis methods to compare surfometry profiles before and after tests is a means of observing tribological damage in detail.

Characterisation of contact stiffness

Modelling the mechanical behaviour of different assembled structures requires knowledge of the behaviours of interfaces, which include in particular the normal and tangential stiffnesses of contacts. Loading conditions and tribological damage can lead to a considerable change in the stiffness of the interface.

The direct measurement of the real stiffness of the contact using hysteresis cycles of tangential/sliding efforts requires the positioning of the sensors as close as possible to the contact, precise knowledge of the measurement system, and the characterisation of the behaviour of the different mechanical parts of the test bench.

Characterisation of the evolution of damping due to dry friction

Modelling the vibration behaviour of assembled structures involves controlling the different sources of damping. Part of the dissipation can stem from the intrinsic behaviour of the material, but the contact interfaces subject to micro-sliding can also be a source of dissipation.

The post processing of force/displacement hysteresis cycles coupled with test-bench modelling make it possible to characterise a damping rate for a tribological situation, and to quantify its evolution with damage.

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This research activity focuses on the detection/prediction and the characterisation of damage that can occur during a product’s lifetime. The occurrence of such damage is taken into account in the dimensioning that results in the certification of composite structures and/or structures assembled by bonding. The principle of tolerance to damage consists in dimensioning a structure to allow it to tolerate the presence of different types of damage, through ensuring mechanical redundancy, additional safety margins, or using materials whose performance relies on intrinsically better characteristics. The reliability of damage characterisation data is studied using stochastic models corresponding to each type of damage.

We approach this problem in several ways :

  • Experimental approach :

        (i) Multiphysics mechanical/thermal/hydric tests,

        (ii) Modification and characteristics of bonding surfaces.

  • Analytical and numerical approach.

Experimental approach

     (i) Multiphysics mechanical/thermal/hydric tests [1-3]

Fracture mechanics are used to study the behaviour of a structure with defaults. These defaults may be visible (emerging cracks) or invisible (blind cracks). Analysis using fracture mechanics correlates parameters stemming from load, geometry and the materials. Elementary fracture modes are characterised according to the relative movement of the crack edges. There are three elementary fracture modes. The first is the opening or cleaving mode (mode I), this is the mode of normal traction in the plane of the crack. The second is the perpendicular sliding mode (mode II) that corresponds to a shearing mode parallel to the plane of the crack and perpendicular to the front of the crack. The last mode is a sliding mode corresponding to a shearing mode parallel to the plane of the crack and parallel to the front of the crack (mode III).

In the laboratory we have designed a test bench that is used to characterise the energy needed to generate the propagation of a crack when the energy release rate exceeds the total energy required to propagate the crack, Gc. The damage propagation kinetics, the propagation curves and the Paris law are then established.

(ii) Modification and characterisation of bonding surfaces [3-5]

To bestow good bonding properties to a bonding agent, it is necessary to control the surface. The factors that increase the real contact surface, like roughness, favour adhesion via a process of mechanical anchoring, and wettability is used to assess bonding. It consists in studying the aptitude of a liquid to spread on the surface of a solid.

Analytical and numerical approach

Multiscale and Multiphysics simulation [6-7] take into account the nonlinear behaviour of materials subject to severe stresses (temperature, humidity coupled with mechanics).

Collaborations :

Airbus Helicopters, National School of Engineering of Sfax, National School of Engineering of Tunis

References :

[1] G. Zambelis, T. Da Silva Botelho, O. Klinkova, I. Tawfiq, C. Lanouette. Evaluation of the energy release rate in mode I of asymmetrical bonded composite/metal assembly. Engineering Fracture Mechanics, 190 : 175-185, mar 2018

[2] R. Kessentini, O. Klinkova, I. Tawfiq, M. Haddar. Transient hygrothermo-mechanical stresses analysis in multi-layers bonded structure with coupled bidirectional model. International Journal of Mechanical Sciences, 150 : 188-201, jan 2019

[3] G. Zambelis, T. Da Silva Botelho, O. Klinkova, I. Tawfiq, C. Lanouette. A new approach in testing fatigue fracture mechanics properties in asymmetrical bonded composite/metal assemblies. Composites Part B : Engineering, 158 : 390-399, feb 2019

[4] A. Bechikh, O. Klinkova, Y. Maalej, I. Tawfiq, R. Nasri. Sandblasting parameter variation effect on galvanized steel surface chemical composition, roughness and free energy. International Journal of Adhesion and Adhesives, 2020

[6] A. Bechikh, O. Klinkova, Y. Maalej, I. Tawfiq, R. Nasri. Effect of dry abrasion treatments on composite surface quality and bonded joints shear strength. IJAA, 2021

[5] R. Kessentini, O. Klinkova, H. Jrad, I. Tawfiq, M. Haddar. Analytical and numerical investigation of coupled hygro-thermo-mechanical model of multi-layers bonded structure. International Journal of Adhesion and Adhesives, 84 : 108-118, aug 2018

[6] R. Kessentini, O. Klinkova, I. Tawfiq, M. Haddar. Modeling the moisture diffusion and hygroscopic swelling of a textile reinforced conveyor belt. Polymer Testing, 75 : 159-166, may 2019 (IF 2.943).

 

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The surface roughnesse play a considerable role in the performance of functional interfaces subject to service loads. The control of surface roughness has an impact on various functionalities such as steering, power transmission, sealing, fastenings, etc. In addition, they are involved in a large number of energy dissipation and/or damage phenomena such as friction, wear, overheating, vibrations caused by friction, scaling, etc.

It is necessary to distinguish early changes to surfaces stemming from running-in and which are aimed at improving performance from evolutions in service which progressively degrade performance and reduce lifetime. In the tribology and materials topic, we approach this problem in several ways :

  • by functional analysis,
  • by modelling surface roughness, 
  • by tribological tests,
  • by measuring evolutions of microgeometry,
  • by simulating phenomena.

Functional analysis allows identifying the phenomena to be optimised and identifying the influential parameters of the first order (including surface roughness, the materials, the type of contact, the relative kinematics and load). It allows orienting the design approach and determining the correct experimental characterisation strategy.

Modelling surface roughness is aimed at obtaining a description of the microgeometry in relation with the desired functionality. It relies as much as possible on normalised parameters and on stochastic descriptions of functional surfaces. This approach permits obtaining the average response of a class of surfaces to a load.

Tribological tests are essential to understand the phenomena involved, their control and to determine the domains of validity of the models proposed. To achieve this, the tribology and materials team has for a long time designed and developed for itself and for its partners, original test benches that allow realistically subjecting test specimen representative of industrial applications to loading. This approach is facilitated by the availability of easily adaptable test benches.

Measuring microgeometric evolutions is a key step of this activity as it permits describing and quantifying the effects of load on the microgeometry of parts in contact. Several techniques are used : optical microscopy, SEM, surfometers with and without contact, etc. This quantification, coupled with test results, is used to estimate the performances of the different solutions tested (materials, surface treatments, coatings, etc.).

Simulating phenomena makes it possible to understand the physics involved by “observing” the interface when it is closed (when the contact is established), where it is impossible to use test instruments. This approach takes into account the nonlinear behaviour of materials and helps the choice of suitable surface coatings. In particular, simulation makes use of the finite elements method.

Collaborations:

GDR SurfTopo, ARTEMA, Total, Safran Aircraft Engines, Valeo 

References:

[1] Ich Tach Tran, Vérification de la validité du concept de surface somme par une approche statistique du contact élastique entre deux surfaces rugueuses, thèse soutenue le 26/01/2015, Ecole Doctorale SPI, Ecole Centrale de Paris.

[2] Stéphane Tchoundjeu-Ngatchou, Caractérisation des performances d’endurance des lubrifiants par suivi des états de surfaces tridimensionnels, thèse soutenue le 08/10/2013, Ecole Doctorale SPI, Ecole Centrale de Paris.

[3] F. Robbe-Valloire, B. Paffoni, R. Progri, Load transmission by elastic, elasto-plastic or fully plastic deformation of rough interface asperities, Mechanics of Materials 33 (2001), Issue 11, pp.617-633

[4] F. Robbe-Valloire, Statistical analysis of asperities on a rough surface, Wear 249 (2001) 401–408

[5] M. Quillien, F. Robbe-Valloire, et al., Guide de préconisations pour augmenter et mesurer les performances tribologiques, ARTEMA , 2017. https://www.artema-france.org/wp-content/uploads/2017/07/Guide_de_preconisations_performances_tribologiques_Artema_supmeca_2017.pdf

[6] ISAE-Supméca (TriboMat) ARTEMA Guide méthodologique pour la définition, la réalisation et le contrôle des portées de joints d’étanchéité à paraître.

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Our research works are aimed at numerically reproducing the response up to fracture of large metal structures subject to accidental overloads (collision, impact, etc.). The objective is to improve the numerical prediction of the resistance of such structures to these types of stress. In particular, we focus on the durability (severity of defaults, capacity of stopping cracks, etc.) of naval and aeronautical structures subjected to intense and rapid loads, involving considerable deformations and deformation velocities.

Ductile fracture generally results from (i) more or less diffuse damage induced by the initiation and growth of micro-cavities, (ii) the localisation of damage/deformation in a narrow band, and (iii) the formation and propagation of macro-cracks.

In the case of ductile rupture of large metal structures, there are typically two scales :

  • The macroscopic scale : corresponding to the scale of the structure (in the order of a metre) ;
  • The microscopic scale : corresponding to the scale of the damage/fracture mechanisms (in the order of µm).

 

The difficulty is to combine these two scales in the same finite element model. Indeed, at the scale of the structure, we want to use large elements, but to describe the damage/rupture mechanisms it is necessary to use elements whose size are compatible with the magnitude of these mechanisms

From the industrial viewpoint, where fast calculations are demanded, it is necessary to use large finite elements. Our objective is to reproduce in a unified three-dimensional methodology, the successive steps leading to the ultimate fracture of the structure by integrating the damage/fracture mechanisms of the material in finite element formulation (large dimensions) while ensuring the objectiveness of the numerical results in relation to the meshing applied.

The unified model developed in the framework of these works is schematised below for a 3D finite element :

To describe diffuse damage (i), the material is assumed to obey a GTN model of microporous plasticity. The kinematic impacts of crack opening (iii), are described by the eXtended Finite Element Method (XFEM). The intermediate step of localisation (ii), which is the most complex from the physical and numerical viewpoint, is described here using a Cohesive Zone Model (CZM) in the context of the XFEM. The CZM allows describing the progressive degradation of the mechanical properties of the material within a localised band, caused by the coalescence of microcavities and finally leading to the occurrence of a macro-crack.

In particular, in our works we focus, on the one hand, on the criteria of transition between diffuse damage and localisation, and on the other, on determining the orientation of the plane of localisation. The localisation is treated here as a phenomenon resulting from either plastic instability (a), or from the coalescence of microcavities (b).

Then two criteria are developed : (a) the first is based on the analysis of bifurcation, while (b) the second is based on critical porosity and takes into account the competition between Modes I and II as a function of the rate of triaxiality.

The model developed in the framework of this research is used as a User Element Subroutine (UEL) in the commercial FEM code Abaqus. Its performances are assessed by numerical simulations of three-dimensional speciment subjected to different load cases.

Here, we can see below the mechanical response (left) of a notched axisymmetric specimen under traction laoding and its fracture appearance (centre), obtained numerically for two mesh sizes with the model developed in the framework of our research works, with the real fracture on the right. It can be seen that the model is capable of reproducing the real fracture’s appearance in “cup and cone” form. It can also be seen that the mechanical response of the specimen obtained with our model, is independent of the mesh size, contrary, for example, to the use of a GTN model alone.

Below, the mechanical response (left) of a notched flat specimen under traction loading and its fracture appearance (centre), obtained numerically for two mesh sizes with the model developed in the framework of our research works, and the real fracture appearance on the right. Once again, the model is capable of reproducing the real fracture appearance and the mechanical response of the test piece obtained with our model is almost independent of mesh size.

Collaborations:

ISAE-SUPAÉRO, Université de Bretagne-Sud.

References:

  1. K. Nikolakopoulos, J.P. Crété, P. Longère, Progressive failure of ductile metals : Description via a three-dimensional couples CZM-XFEM based approach, Engineering Fracture Mechanics, Volume 243, pages 1-34, 2021.
  2. K. Nikolakopoulos, Modélisation numérique des structures hautes résistance soumises à des sollicitations sévères, Doctorat de l’Université de Toulouse, 2020.
  3. K. Nikolakopoulos, J.P. Crété, P. Longère, Volume averaging based integration method in the context of XFEM-cohesive zone model coupling, Mechanics Research Communications, Volume 104, pages 1-7, 2020.
  4. J. Wolf, P. Longère, J.P. Crété, J.M. Cadou, Strain localization in ductile materials : Assessment of three X-FEM-based enrichment methods, Mechanics Research Communications, Volume 99, pages 1-7, 2019.
  5. J. Wolf, P. Longère, J.M. Cadou and J.P. Crété, Numerical modelling of strain localization in engineering ductile materials combining cohesive models and X-FEM, International Journal of Mechanics and Materials in Design, Volume 14, pages 177-193, 2018.
  6. J.P. Crété, P. Longère and J.M. Cadou, Numerical modelling of crack propagation in ductile materials combining the GTN model and X-FEM, Computer Methods in Applied Mechanics and Engineering, Volume 275, pages 204-233, 2014.
  7. J.P. Crété, Traitement numérique de la fissuration d’une structure navale, Doctorat de l’Université de Bretagne Sud, 2013.
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Recycled Constituent Composites result from the processing and characterization of composites manufactured using recycled materials. These composites exhibit light weight and high strength, while having a low manufacturing cost. Industry is witnessing an increasing demand for high-performance, low-cost materials, as well as energy-saving production techniques.

As engineers, we are challenged to design reliable applications for long-term performance. Many composites manufactured from recycled materials, such as fresh scrap rubber and scrap metal chips (essentially Al, Ti, Nb, Ti-AL, Ni-Al, etc.), offer the light weight, strength and durability needed for aircraft and automotive applications.

Currently these composites are often composed of thermosets reinforced with ground scrap materials, producing tough, corrosion resistant parts. Machining chips are being used as the metal matrix for composites through Sintering + Forging, Thixoforming and/or Thixoinfiltration to improve mechanical and physico-chemical properties for certain applications

I- Novel Recycled Rubber based Composites : Military & Microwave Absorption Applications

This research is being pursued in two parts in the framework of a PhD thesis by Gamze CAKIR

1- Due to its high impact energy absorption properties, devulcanized recycled rubber-based composites reinforced with glass bubbles, short natural fibres, etc. can be considered as a low-cost candidate material for military applications which require lightweight protection against shock waves. This work aims at modelling low-cost devulcanized recycled rubber-based composite behaviour at high strain rates. Consequently, we established a continuum-based material model in order to capture the macroscopic behaviour of the recycled rubber-based composite material and numerically reproduce the results from the basic characterization tests. The model is implemented for Finite Element Analysis Software ABAQUS/Standard as a user subroutine UMAT for implicit nonlinear finite element calculations in order to simulate the behaviour of several RVEs representing the microstructure of the composite and its behaviour at high strain rates.

2- SiC whiskers and magnetic ferric oxide (Fe3O4) with fresh scrap (recycled) rubber powder (generally NBR) are used to design novel composite materials. Before mixing and milling the scrap powder rubber is devulcanized. After obtaining a homogenous mixture (dried milling + ball milling), very simple hot compaction had to be carried out to produce novel composite materials. The final samples were characterized by XRD, SEM, and a magnetometer. Finally, the lower values of electromagnetic waves passing through the SiC/Fe3O4/NBR composite plates in the 2 10GHz band were easily predicted numerically and compared with measured values.

II- New Design of Recycled metal-based composites : Aeronautical Engineering Applications

1- Recycled aluminium (7075) based composites through Sintering + Forging ; an experimental and numerical approach for toughening mechanisms.

a- First part : reinforced with TiC and/or TiB2, and MoS2.

b- Second part : reinforced with g-Al2O3 Fibre/Nb2Al

This research is carried out in the framework of a PhD thesis by Lilia Mihlyuzova

2- Design of “Cu-Zn-Al-Ni”, “NiTiCu” and “FeTi45” smart composites ; Magnetic permeability, thermal & electrical conductivities

ISAE-SUPMECA/UTCM ongoing partially supported by the French Embassy in Sofia/BG and partially by AUF (for Balkan Countries). All of the basic materials like the scrap sheets were prepared by SNECMA-FRANCE & AIRBUS-LONDON-UK).

3- Manufacturing of “Ni-Ti” based composites from fresh scrap thin sheets reinforced with Nb and TiB2 by hot-forged bonding : Sandwich Structures.

Schematic presentation of the 3P-Bending test (ASTM790) and experimental set up with microstructure of the sandwich composite structure before and after the bending test

4- Recycled Aluminium Based Composites Reinforced with Glass Bubbles and/or Fly Ash Micro Balloons

Produced via Thixoforming and/or Thixoinfiltration.

Common Research collaboration with ISAE-SUPMEC & UNICAMP-FEM/SP/BRAZIL.

Partially funded by CNPq – Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brazil) ; French Program Catedra UNICAMP-SP/BR.

Only one project is ongoing :

Compressive Behaviour of AlSiMg0.5Mn Matrix Syntactic Foam Produced via Thixoinfiltration of Fly Ash Micro Balloons.

Correspondent : Senior Researcher Fabio Gatamorta, PhD with Cyclotron-Sao Paulo, in Campina/BR.

References :

  1. Emin BayraktarF. GatamortaH. EnginsoyJ. PolisI. Miskioglu.New Design of Composites from Fresh Scraps of Niobium for Tribological Applications. Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.35-43, 2021, ⟨10.1007/978-3-030-59868-6_6⟩
  2. H. EnginsoyEmin BayraktarI. MiskiogluF. GatamortaD. KatundiDesign of Copper and γ-Alumina Reinforced Recycled Aluminium Matrix Composites through Sintering + Forging, Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.73-80, 2021, ⟨10.1007/978-3-030-59868-6_11⟩
  3. F. GatamortaH. EnginsoyEmin BayraktarI. MiskiogluD. KatundiDesign of Recycled Alumix-123 Based Composites Reinforced with γ-Al2O3 through Combined Method ; Sinter + Forging Mechanics of Composite, Hybrid and Multifunctional Materials Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.9-17, 2021, ⟨10.1007/978-3-030-59868-6_3⟩
  4. H. EnginsoyF. GatamortaEmin BayraktarI. MiskiogluA. LarbiDesign of Copper and Silicon Carbide (SiC) Reinforced Recycled Aluminium Matrix Composites Through Sintering + Forging, Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.45-52, 2021, ⟨10.1007/978-3-030-59868-6_7⟩
  5. Emin BayraktarD. KatundiF. GatamortaI. MiskiogluH. Murat EnginsoyDesign of Recycled Thin Sheet “Ti-Al” Based Composites Reinforced with AA1050, Boron, TiB2, TiC, and B4C Through Hot-Forged Bonding, Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.65-71, 2021, ⟨10.1007/978-3-030-59868-6_10⟩
  6. R. MoraesJ. PaschoalEmin BayraktarR. SilvaR. Costa et al. Study of a Semisolid Processing Route for Producing an AlSiMg0.5Mn Matrix Syntactic Foam via Thixoinfiltration of Fly Ash Micro Balloons
  7. Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.107-113, 2021, ⟨10.1007/978-3-030-59868-6_16⟩
  8.  
  9. H. EnginsoyEmin BayraktarI. MiskiogluD. KatundiManufacturing of “Ni-Ti” Based Composites from Fresh Scrap Thin Sheets Reinforced with Nb and TiB2 Through Hot-Forged Bonding : Sandwich Structures
  10. Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.53-59, 2021, ⟨10.1007/978-3-030-59868-6_8⟩
  11. L. MihlyuzovaH. EnginsoyD. DontchevEmin BayraktarTailored Behaviour of Scrap Copper Matrix Composites Reinforced with Zinc and Aluminium : Low Cost Shape Memory Structures, Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 6, SPRINGER, 2021,ISBN : 978-3-030-59868-6, http://link.springer.com/, pp.27-33, 2021, ⟨10.1007/978-3-030-59868-6_5⟩
  12. Ozgur AslanEmin BayraktarAnalytical Solutions of Model Problems for Large-Deformation Micromorphic Approach to Gradient Plasticity, Applied Sciences, MDPI, 2021, ⟨10.3390/app11052361⟩
  13. Fathi MasoudS. SapuanMohd Khairol Anuar Mohd AriffinY. NukmanEmin BayraktarExperimental Analysis of Heat-Affected Zone (HAZ) in Laser Cutting of Sugar Palm Fiber Reinforced Unsaturated Polyester Composites, Polymers, MDPI, 2021, 13 (5), pp.706. ⟨10.3390/polym13050706⟩
  14. H. Murat EnginsoyEmin BayraktarDhurata KatundiIbrahim MiskiogluDetailed investigation of TiN effect on hybrid intermetallic composites manufactured by combined sinter + forging method, Mechanics of Advanced Materials and Structures, Taylor & Francis, 2021, pp.1-12. ⟨10.1080/15376494.2021.1886380⟩
  15. B. El AoudM. BoujelbeneA. BoudjemlineEmin BayraktarS. Ben Salem et al. Investigation of cut edge microstructure and surface roughness obtained by laser cutting of titanium alloy Ti-6Al-4V, Materials Today : Proceedings, Elsevier, 2021, ⟨10.1016/j.matpr.2020.12.756⟩
  16. M. BoujelbeneB. El AoudEmin BayraktarI. ElbadawiI. Chaudhry et al. Effect of cutting conditions on surface roughness of machined parts in CO2 laser cutting of pure titanium, Materials Today : Proceedings, Elsevier, 2021, ⟨10.1016/j.matpr.2020.12.179⟩
  17. Ozgur AslanEmin BayraktarA Large-Deformation Gradient Damage Model for Single Crystals Based on Microdamage Theory, Applied Sciences, MDPI, 2020, 10 (24), pp.9142. ⟨10.3390/app10249142⟩
  18. D. Katundi, I. Miskioglu, and E. Bayraktar, Design of Intermetallic Mg (Recycled Ti-Al) Based Composites Through Semi Powder Metallurgy Method, , https://doi.org/10.1007/978-3-030-30028-9_4, pp.27-34, 2020, ⟨10.1007/978-3-030-30028-9_4⟩
  19. E. Bayraktar, I. Miskioglu, D. Katundi, and F. Gatamorta, Manufacturing of Recycled Aluminum Matrix Composites Reinforced of TiC/MoS2/Al2O3 Fiber Through Combined Method : Sintered + Forging, Springer, Chapter 3, pp. 15-25, 2019, https://doi.org/10.1007/978-3-030-30028-9_3, pp.15-25, 2020, ⟨10.1007/978-3-030-30028-9_3⟩
  20. Emin BayraktarTao GaoZhidan SunHongqian XueZhi Qin et al. Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime, Metals, MDPI, 2020, 10 (11), pp.1507. ⟨10.3390/met10111507⟩
  21. Sonia EzeddiniMohamed BoujelbeneEmin BayraktarSahbi Ben SalemOptimization of the Surface Roughness Parameters of Ti–Al Intermetallic Based Composite Machined by Wire Electrical Discharge Machining, Coatings, MDPI, 2020, 10 (9), pp.900. ⟨10.3390/coatings10090900⟩
  22. A. Boudjemline, M. Boujelbene, Emin BayraktarSurface Quality of Ti-6Al-4V Titanium Alloy Parts Machined by Laser Cutting, Engineering technology and Applied science research , Dionisios Pylarinos, 2020, 10 (4), pp.6062-6067. ⟨10.48084/etasr.3719⟩
  23. H.M. EnginsoyEmin BayraktarD. KatundiF. GatamortaI. MiskiogluComprehensive analysis and manufacture of recycled aluminum based hybrid metal matrix composites through the combined method ; sintering and sintering + forging. Composites Part B : Engineering, Elsevier, 2020, 194, pp.108040. ⟨10.1016/j.compositesb.2020.108040⟩
  24. Fathi MasoudS.M. SapuanMohd Khairol Anuar Mohd AriffinY. NukmanEmin BayraktarCutting Processes of Natural Fiber-Reinforced Polymer Composites, Polymers, MDPI, 2020, 12 (6), pp.1332. ⟨10.3390/polym12061332⟩
  25. Anheng WangHongqian XueEmin BayraktarYanli YangShah Saud et al. Analysis and Control of Twist Defects of Aluminum Profiles with Large Z-Section in Roll Bending Process, Metals, MDPI, 2020, 10 (1), pp.31. ⟨10.3390/met10010031⟩
  26. Artur CzupryńskiMarcin AdamiakEmin BayraktarBernard WyględaczComparison of tribological properties and structure of coatings produced in powder flame spraying process on grey cast iron, Welding Technology Review, 2020, 92 (3), pp.7-21. ⟨10.26628/wtr.v92i3.1102⟩
  27. Alaeddin Burak IrezEmin BayraktarDesign of Epoxy Modified Recycled Rubber-Based Composites : Effects of Different Contents of Nano-Silica, Alumina and Graphene Nanoplatelets Modification on the Toughening Behavior, Gazi University, Journal of Science, 2020, 33 (1), pp.188-199. ⟨10.35378/gujs.585446⟩
  28. Emin BayraktarAlaeddin Burak IrezIbrahim MiskiogluFracture Toughness Analysis of Epoxy-Recycled Rubber-Based Composite Reinforced with Graphene Nanoplatelets for Structural Applications in Automotive and Aeronautics, Polymers, MDPI, 2020, 12 (2), pp.448. ⟨10.3390/polym12020448⟩
  29.  F. Gatamorta, Dhurata Katundi, E. Bayraktar, L. M. P. Ferreira, and M. L. N. M. Melo, Magnetic Shape Memory Composite (MSMC) Design from Intermetallic Cu-NiTi-MnAl-Fe3O4 Alloy as an Alternative Replacement for Actuators, Springer, Chapter 7, pp. 47-53, 2019, https://doi.org/10.1007/978-3-030-30028-9_7,
  30. A. Burak Irez, Emin Bayraktar Design of a Low-Cost Aircraft Structural Material Based on Epoxy : Recycled Rubber Composites Modified with Multifunctional Nano Particles, Mechanics of Composite and Multi-functional Materials, Volume 5,, pp.73-80, ⟨10.1007/978-3-030-30028-9_11⟩
  31. Emin BayraktarDhurata KatundiFábio GatamortaIbrahim Miskioglu. Design of Hydroxyapatite/Magnetite (Hap/Fe3O4) Based Composites Reinforced with ZnO and MgO for Biomedical Applications, Biomedical Journal of Scientific and Technical Research, Vol. 21, Issue 2, pp. 15790-15797, 2019 <10.26717/BJSTR.2019.21.003585>
  32. E. Bayraktar, and M. L. N. M. Mel, Recycling of Aluminium-431 by High Energy Milling Reinforced with TiC-Mo-Cu for New Composites in Connection Applications, Chapter 6, pp.41-46, 2019, Springer,, https://doi.org/10.1007/978-3-030-30028-9_6, In press, ⟨10.1007/978-3-030-30028-9_6⟩
  33. G. Katundi, D. Katundi, E. Bayraktar, and I. Miskioglu, Alternative Composite Design from Recycled Aluminum (AA7075) Chips for Knuckle Applications-II, Springer, Chapter 2, pp. 9-14, 2019, pp.9-14, ⟨10.1007/978-3-030-30028-9_2⟩
  34.  A. Burak Irez, Georges ZambelisEmin BayraktarA New Design of Recycled Ethylene Propylene Diene Monomer Rubber Modified Epoxy Based Composites Reinforced with Alumina Fiber : Fracture Behavior and Damage Analyses. Materials, MDPI, 2019, 12 (17), pp.2729. ⟨10.3390/ma12172729⟩
  35. Claudiney MendonçaPatricia CapellatoEmin BayraktarFábio GatamortaJosé Gomes et al. Recycling Chips of Stainless Steel Using a Full Factorial Design, Metals, MDPI, 2019, 9 (8), pp.842. ⟨10.3390/met9080842⟩
  36. H. Murat. EnginsoyF. GatamortaEmin BayraktarM.H. RobertI. MiskiogluExperimental and numerical study of Al-Nb2Al composites via associated procedure of powder metallurgy and Thixoforming, Composites Part B : Engineering, Elsevier, 2019, 162, pp.397-410. ⟨10.1016/j.compositesb.2018.12.138⟩
  37. A. Burak Irez, Emin Bayraktar, Ibrahim MiskiogluFlexural fatigue damage analyses of recycled rubber - modified epoxy-based composites reinforced with alumina fibres, Fatigue & Fracture of Engineering Materials & Structures, Wiley-Blackwell, 2019, volume 42, issue 4, pp. 959-971 <doi.org/10.1111/ffe.12964>
  38. Emin BayraktarHalil EnginsoyAli KurşunA Comprehensive Study on the Deformation Behavior of Hadfield Steel Sheets Subjected to the Drop Weight Test : Experimental Study and Finite Element Modeling, Metals, MDPI, 2018, 8 (9), ⟨10.3390/met8090734⟩
  39.  A. Burak IrezEmin BayraktarI. Miskioglu, Recycled and devulcanized rubber modified epoxy-based composites reinforced with nano-magnetic iron oxide, Fe3O4, Composites Part B : Engineering, Elsevier, 2018, 148, pp.1-13. ⟨10.1016/j.compositesb.2018.04.047⟩
  40. Emin BayraktarFábio GatamortaMaria Helena RobertMETHOD FOR OBTAINNING METALLIC CELULAR MATERIALS, National Patent, Brazil, 2018 Patent n° : BR1020180118080.
  41. A. IrezI. MiskiogluEmin BayraktarDesign of Cost Effective Epoxy + Scrap Rubber Based Composites Reinforced with Titanium Dioxide and Alumina Fibers, Mechanics of Composite, Hybrid and multifunctional Materials, volume 5, pp.59-66, 2018. <doi.org/10.1007/978-3-319-95510-0_7>
  42. M. DouiriM. BoujelbeneEmin BayraktarS. Ben SalemA Study of the Surface Integrity of Titanium Alloy Ti-6Al-4V in the Abrasive Water Jet Machining Process, Mechanics of Composite, Hybrid and multifunctional Materials, Springer, Volume 5, pp.221-228, 2018 <doi.org/10.1007/978-3-319-95510-0_27>
  43. Rodolfo LeibholzHenrique LeibholzEmin BayraktarMaria Helena RobertInvestigation on Microstructure and Interfaces in Graded FE50007 / WC Composites Produced by Casting, Mechanics of Composite, Hybrid and multifunctional Materials, Springer, Volume 5, pp.321-329, 2018 <doi.org/10.1007/978-3-319-95510-0_43>
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The crucial role of interfaces and interphases in structural problems in many areas of engineering (civil engineering, mechanical engineering, biomechanics, electronics, etc.) is now well-known. In particular, they can have a strong impact on the global response of structures subject to severe solicitations.

Our research works focus in a general way on the mechanical modelling of solid interphases and interfaces, that’s to say the mechanical analysis and description of phenomena deriving from the interaction between two deformable solids in the case of interfaces, and the presence of a thin layer (cf. adhesive, physico-chemical interaction zone, “third body”, etc.) between solids (cf. adherents) in the case of interphases.

Interphase/interface problems are multiscale by nature. The main purpose of studying them is often to describe microscopically (cf. the global behaviour of structures) the effects of phenomena occurring at microscopic and nanometric scale in the areas of interaction. A considerable number of scientific questions are raised and involved in particular phenomena of adhesion, friction, damage, and specific surface properties like microgeometry. Understanding these phenomena is very difficult because they occur inside the contact and do not permit direct observation. This difficulty is further compounded when dealing with problems of imperfect interfaces, that’s to say when the mechanical surfaces must accommodate relative movements and transmit efforts.

We particularly focus on soft and hard imperfect interfaces, according to the classification of the different regimes of imperfect interface according to Benveniste and Miloh [1]. Generally, the laws of imperfect interface describe the relation between the vector of interface stresses and the vector of relative movements. When continuity exists at the interface in terms of stress (i.e. no stress jump at the interface) and a discontinuity (i.e. non zero stress jump) in terms of displacements, the term soft interface (or spring-like interface) is used ; whereas the term hard interface is used when there is both a discontinuity of interface stresses and a discontinuity of relative displacements.

The main aim of our research is to develop new imperfect interface laws capable of taking into account the main physical phenomena of the contact zone or the thin layer that we want to model. To do this, a dual homogenisation is used [2] : the analytical laws governing the imperfect interface problem (interface conditions, evolution laws, etc.) are derived by applying the theory of higher order asymptotic expansions ; the effective mechanical properties of the interphase are derived through micromechanical homogenisation.

This approach has made it possible to obtain linear [2, 3] and nonlinear [4-6] imperfect interface laws that have been applied efficiently to :

  • describe diffuse damage (microcracking) and its evolution in soft [7] and hard [8, 9] interfaces ;
  • obtain equivalent contact stiffnesses in a rough contact problem [10] ;
  • describe cohesive fracture in bonding problems [11].

Masonry panel subjected to diagonal compression [7]. The method proposed predicts preferential microcracking zones.

Model of a rough contact with equivalent springs [10]. Comparison of normal N and tangential T contact stiffnesses with experimental data available in the literature.

Bending test on a GFRP beam-column node [11]. Detail of the fracture of a bonded joint (left) and numerical simulation with an FE interface (right).

Collaborations

Laboratoire de Mécanique et d’Acoustique (Marseille), Université de Ferrara (Italie), Université de Salerno (Italie)

References :

  1. Benveniste, Y., & Miloh, T. (2001). Imperfect soft and stiff interfaces in two-dimensional elasticity. Mechanics of materials, 33(6), 309-323.
  2. Raffa, M. L. (2015) Micromechanical modeling of imperfect interfaces and applications. Thèse doctorale, Université de Rome “Tor Vergata” en cotutelle avec Aix-Marseille Université.
  3. Fouchal, F., Lebon, F., Raffa, M. L., & Vairo, G. (2014). An interface model including cracks and roughness applied to masonry. The Open Civil Engineering Journal, 8, 263-271.
  4. Dumont, S., Lebon, F., Raffa, M. L., & Rizzoni, R. (2017). Towards nonlinear imperfect interface models including micro-cracks and smooth roughness. Annals of Solid and Structural Mechanics, 9(1), 13-27.
  5. Raffa, M. L., Lebon, F., & Rizzoni, R. (2016). On modelling brick/mortar interface via a St. Venant-Kirchhoff orthotropic soft interface. Part I : theory. International Journal of Masonry Research and Innovation, 1(2), 142-164.
  6. Raffa, M. L., Lebon, F., & Rizzoni, R. (2018). Derivation of a model of imperfect interface with finite strains and damage by asymptotic techniques : an application to masonry structures. Meccanica, 53(7), 1645-1660.
  7. Raffa, M. L., Lebon, F., & Rizzoni, R. (2017). On modelling brick/mortar interface via a St. Venant-Kirchhoff orthotropic soft interface. Part II : in silico analysis. International Journal of Masonry Research and Innovation, 2(4), 259-273.
  8. Raffa, M. L., Rizzoni, R., & Lebon, F. (2021). A Model of Damage for Brittle and Ductile Adhesives in Glued Butt Joints. Technologies, 9(1), 19.
  9. Raffa, M. L., Lebon, F., & Rizzoni, R. (2022). A micromechanical model of a hard interface with micro-cracking damage. International Journal of Mechanical Sciences, 216, 106974.
  10. Raffa, M. L., Lebon, F., & Vairo, G. (2016). Normal and tangential stiffnesses of rough surfaces in contact via an imperfect interface model. International Journal of Solids and Structures, 87, 245-253.
  11. Maurel-Pantel, A., Lamberti, M., Raffa, M. L., Suarez, C., Ascione, F., & Lebon, F. (2020). Modelling of a GFRP adhesive connection by an imperfect soft interface model with initial damage. Composite Structures, 239, 112034.
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The works performed on energy absorption systems (EAS) as a concept of passive safety in vehicles have given rise to strong collaboration between international teams. In the PhD thesis by Mr Baleh (defended in 2004), a new experimental device called ACTP (Absorption by Compression-Torsion Plastic Deformation) was patented in 2005 (no. WO 2005090822) to improve the dissipative capacity of EAS. For aluminium, an increase of energy absorbance exceeding 180% was recorded in comparison to a uniaxial case. Thus, a collaboration with American teams was undertaken to interpret these increases and led to an article and an M.Sc. dissertation (USA). It led to a patent and the publication of 4 scientific articles and communications. Following the same path, the PhD thesis by Menouer (defended in April 2018) focused on the effect of triaxial loading on the energy absorbed by aluminium tubes with square cross sections. Original results were obtained (3 articles published and 3 communications).

The research works carried out by Mr AHMED ALI (PhD thesis not yet defended), are based on the idea of a patent registered in 2014 (INPI : No. BT 890/1400843), for nonconventional EAS using steel tubes treated thermically by the cementation of 15% of the external surface. Different shapes (rings, vertical strips and helixes) are key items in the study. These tubes have been tested under quasi-static and dynamic uniaxial compression. The results obtained are innovative. At present it has led to 1 article (with others in preparation) and 2 communications. Between 2017-2019, the aim of the PhD thesis of M. HABTE, funded by Cumpas France, was to produce a finite element model of these results. It was defended in December 2019. One article has been published (with others in preparation), and 4 communications have been given.

References:

Articles in peer-reviewed international journals & Patents

1) Abdul-Latif, A., 2000, “On the Lateral Collapse of an Identical Pair of Cylinders,” International journal of Solids and Structures, vol. 37, 1955-1973

2) Nesnas, K. and Abdul-Latif, A., 2001, “Lateral Plastic Collapse of Cylinders : Experiments and Modeling,” Computer Modeling in Engineering and Sciences, vol. 2, pp. 373-388

3) Abdul-Latif, A. and Nesnas, K., 2003, “Plastic Collapse of Cylinders under Constrained Sides and Length Conditions,” ASME, Engineering Materials and Technology, vol.125, 215-221

4) Abdul-Latif, A., 2004, “A Comparison of Two Self-Consistent Models to Predict the Cyclic Behavior of Polycrystals,” ASME, Engineering Materials and Technology, vol.126, 62-69

5) Abdul-Latif A., & Baleh R., 2005, "Dispositif amortisseur à organe déformable plastiquement, notamment pour véhicules de transport," PCT/FR05/00391- délivré à l’INPI et WO 2005090822- International.

6) Abdul-Latif, A., Baleh, R., and Aboura, Z., 2006, “Some improvements on the energy absorbed in axial plastic collapse of hollow cylinders,” International Journal of Solids and Structures, vol.43, 1543-1560

7) Baleh, R., and Abdul-Latif, A., 2007, “Uniaxial-biaxial transition in quasi-static plastic buckling used as an energy absorber,” ASME, Journal of Applied Mechanics, vol.74, pp. 628-635

8) Abdul-Latif, A. and Baleh, R., 2008, “Dynamic biaxial plastic buckling of circular shells,” ASME, Journal of Applied Mechanics, vol. 75, issue 3, 031013

9) Drusin, N., Mahapatra, R., Abdul-Latif, A., Baleh, R., Wilhelm, C., Stoyanov, P., and Es-Said, O.S., 2008, “Microstructure Analysis of Aluminum Alloy and Copper Alloy Circular Shells after Multiaxial Plastic Buckling,” ASM, Journal of Materials Engineering and Performance, vol. 17, pp.755–766

10) Abdul-Latif, A., 2011, “Experimental Comparison of Several Energy Absorbing Devices,” ASM, Journal of Materials Engineering and Performance, vol. 20, pp. 1392-1400

11) Abdul-Latif A., 2014, "Système d’absorption d’énergie à organe en composite métallique déformable plastiquement," No. BT 890/1400843-délivré à l’INPI, France

12) Menouer A., Baleh R., Djebbar A. and Abdul-Latif A., 2014, “New generation of energy dissipating systems based on biaxial buckling,” Journal of Thin-Walled Structures, vol. 85, pp. 456-465

13) Abdul-Latif A., Ahmed-Ali A., Baleh R., and Ould Ouali M., 2017, “Innovative solution for strength enhancement of metallic like-composite tubular structures axially crushed used as energy dissipating devices,” Journal of Thin-Walled Structures, 119, pp. 332–344

14) Baleh R., Abdul–Latif A., Menouer A., Razafindramary D., 2018, “New experimental investigation of non-conventional dynamic biaxial plastic buckling of square aluminum tubular structures,” International Journal of Impact Engineering, 122, pp. 333-345

15) Habte H. S., Abdul-Latif A., 2020, “Finite element modeling of non-conventional energy dissipating systems using metallic like-composite tubular structures,” International Journal of Impact Engineering, 139, 103511.

Thèses

1) Baleh R., 2004, "Flambage Plastique Quasi-statique et Dynamique de Structures Tubulaires Métalliques sous Sollicitations Simple et Complexe -Système d’absorption d’énergie- via un Nouveau Dispositif Expérimental," thèse, École doctorale de l’Université de Technologie de Troyes

2) Menouer A., 2018, “Effet de triaxialité du Chargement sur la Capacité Dissipatrice d’un Système d’Absorption d’Énergie Tubulaire,” Thèse en collaboration, Université de Tizi-Ouzou, Algérie

3) SAHLE HABTE H., 2019, “Finite element modeling of axially crushed metallic like-composite tubular structures under quasi-static and dynamic loading regimes used as energy dissipating devices,” Ecole doctorale, Université de Cergy-Pontoise

4) Abdellah AHMED ALI A., “Flambage plastique d’un système tubulaire en composite métallique comme système d’absorption d’énergie sous différentes vitesses de sollicitations quasi-statique et dynamique,” Université de Tizi-Ouzou, Algérie (thèse pas encore soutenue)

 Actes publiés de conférences internationales, congrès et colloques

1) Nesnas, K. and Abdul-Latif, A., 1997, “Modeling of Large Deformation of Cylinders under Transverse Loading,” Physics and Mechanics of Finite Plastic & Viscoplastic Deformation, pp. 435, ed. by Akhtar S. Khan, Neat Press (Maryland)

2) Abdul-Latif, A. and Nesnas, K., 1999, “On the Large Deformation of Cylinders with Constrained Sides Condition,” Constitutive and Damage Modeling of Inelastic Deformation and Phase Transformation, pp.685, Ed. by Akhter S. Khan, Neat Press (Maryland)

3) Abdul-Latif, A., 2002, “Comparative Study of Several Energy Dissipating Devices,” CSM3 3ème Congrès sur les matériaux, 16-18 Mai, Beyrouth (Liban).

4) Baleh, R., et Abdul-Latif, A., 2003, “Sur l’effet de rochet multiaxial,” CNRIUT 2003, 15-16 mai 2003, (Tarbes).

5) Baleh, R., Abdul-Latif, A., et Aboura, Z., 2003, “Grande déformation de structures tubulaires : systèmes d’absorption d’énergie,” CNRIUT 2003, 15-16 mai 2003, (Tarbes)

6) Baleh, R., Abdul-Latif, A., and Aboura, Z., 2003, “Plastic flow and its influence on the absorbed energy during the axial collapse of tubes,” Plasticity 2003, January 3-9, (Quebec)

7) Baleh, R., Abdul-Latif, A. et Aboura, Z., 2003, “Etude Expérimentale sur un Système d’Absorption d’Energie par Ecrasement Axial,” 16ème Congres Français de Mécanique, 1-5 Sept., Nice.

8) Baleh, R., Abdul-Latif, A., et Aboura, Z., 2005, “Comportement dynamique de tube écrasé axialement,” 17ème Congres Français de Mécanique, 29 août-2 Sept., Troyes.

9) Baleh, R., Abdul-Latif, A., et Aboura, Z., 2006, “Energy absorption improvement via sub-divided tubes under Uniaxial Dynamic loading,” Second International Conference on Engineering Failure Analysis (ICEFA II), 13 – 15 September 200, Toronto, (Canada)

10) Baleh, R., Aboura, Z., Abdul-Latif, A. et D., Razafindramary, 2007, “Ecoulement Plastique et Dissipation d’Energie sous Chargement Dynamique,” CNRIUT 2007, 31 mai-1er juin (Thionville-Yutz).

11) Abdul-Latif, A. and Baleh, R., 2008, “A new concept of dynamic biaxial plastic crushing of metallic thin-walled tubes,” 22th International Congress of Theoretical and Applied Mechanics (ICTAM2008), August 24–30 (Adelaide, Australia).

12) Abdul-Latif, A., et Baleh, R., 2010, “Sur le concept des systèmes d’absorption d’énergie et sa dernière innovation,” (Conférence Plénière), Les 7èmes Journées de Mécanique JM’EMP07, 12-13 Avril, (Alger).

13) Ishell, A., Abdul-Latif, A., Baleh, R., and Haboussi, M., 2011, “Dynamic biaxial plastic buckling of stainless-steel thin tubes,” COMPDYN 2011 3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 25-28 May 2011, Corfu (Greece)

14) Abdul-Latif, A. and Baleh, R., and Isheil, A., 2012, “Strain Rate and loading Complexity Effect on the Crushed Stainless-Steel Tubes Behavior,” 23rd International Congress of Theoretical and Applied Mechanics (ICTAM 2012), August 19 -24, 2012 (Pékin).

15) Lounis D., Baleh R., Menouer A., Abdul-Latif A., 2014, “New generation of energy dissipating systems based on biaxial buckling for improving vehicular crashworthiness”, Railways 2014, The Second International Conference on Railway Technology : Research, Development and Maintenance, 8-11 April 2014, Ajaccio (France)

16) Ahmed-Ali A., Baleh R., Razafindramary D., and Abdul-Latif A., 2015, “Effect of treated zone geometry on the dynamic plastic buckling of steel composite thin tubular structures,”International Conference on Dynamics of Composite Structures- DYNCOMP‟2015, 2nd to 4th June, Arles, France.

17) Abdul-Latif A., Ahmed-Ali A., Baleh R., Razafindramary D., 2016, “New concept of passive energy dissipating energy based on plastic buckling,” ICTAM 2016, 21-26 August 2016, Montreal, Canada

18) Baleh R., Menouer A., Razafindramary, D., and Abdul-Latif A., 2017, “Ecoulement énergétique sous flambage dynamique multiaxial,” CAM 2017, 26 -30 Novembre, Algérie (Constantine).

19) Haileleoul Sahle HABTE, Abdul–Latif A., 2019, “New numerical approach for enhancing non-conventional energy absorbing capacity of plastically buckled tubular structure,” ECHT-2019 Conference, 5-7 June 2019 Bardolino (Italy).

20) Habte H. S., and Abdul–Latif A., 2020, “Numerical Investigation of New Non-Conventional Energy Dissipating Systems and Their Applications,” Transport Research Conference (2020 TRB) Annual Meeting, January 12-16, (Washington, D.C.).

21) Abdul-Latif A., and Habte H.S., 2020, “New plastic buckling response of non-conventional tubular structures,” ICTAM 2020, 23-28 August 2020, Milano, Italy

22) Abdul-Latif A. and Habte H. S., 2020, “Plastic buckling resistance of non-conventional tubular structures,” Engineering Mechanics Institute Conference 2020 (EMI 2020) and the Probabilistic Mechanics & Reliability Conference 2020 (PMC 2020), 26-29 May, 2020 (New-York)

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Because deformation modes and fracture mechanisms under multiaxial loads are far from being mastered, our team has recently carried out work on open-cell aluminium foams subjected to multiaxial stress. This original idea consists in creating different biaxial loading complexities combined with compression-torsion through ACPT (see Fig.1). The effect of foam density and the complexity of the load on its mechanical behaviour will be studied for several porosities. This idea has led to a project presented at Cumpas France in the programme (France-Ethiopia). Two PhD students (HULUKA and ISMAEL) were recruited and began their theses in 2020, funded by Cumpas France. The first thesis is purely experimental in which different aluminium foams are studied whereas the other consists in modelling the behaviours of the same foams studied by another thesis using finite elements.

(a) Conception virtuelle et (b) photo réelle de l’assemblage final de l’ACTP et la mousse d’aluminum

Fig.1 (a) Virtual design and (b) real photo of the final assembly of the ACPT and the aluminium foam.

References:

1) Abdul–Latif A., Menouer A., Baleh R., and Deiab I.M., 2021, “Plastic response of open cell aluminum foams of highly uniform architecture under different quasi-static combined biaxial compression-torsion loading paths,” Materials Science and Engineering B, 266, 115051

Theses:

1) M. Hairedin ISMAEL 2020- 

Topic: Finite element numerical modelling of a new generation of advanced metal foams. Ecole doctorale, université de Cergy-Pontoise (Thesis financed by Campus France)

2) M. Solomon Bayu HULUKA S., 2020- 

Topic: Experimental study on a new generation of advanced aluminium foams. Ecole doctorale, université de Cergy-Pontoise

(Thesis financed by Campus France)

Collaborations

Main collaborations in France

  • Institut Clément Ader (UMR 5312)
  • Laboratoire de Sciences et Procédés des Matériaux (UPR 3407)
  • Centre des Matériaux (UMR 7633)
  • Laboratoire de Mécanique et Acoustique (UMR 7031)

 

Main international collaborations

  • Université de Ferrara (Italie)
  • Université de Sofia (Bulgarie)
  • Université de Coimbra (Portugal)

Project ANR ASHENDO - Hygromechanical analysis of damage in multi-material assemblies : multiscale modelling and characterization.

GDR SurfTopo (n°2077) : Surface topography.

Main industrial collaborations :

  • Safran Aircraft Engines
  • Airbus Helicopters
  • Cnes
  • Valeo Embrayages
  • Cetim

Outreach

The members of the theme regularly put their expertise at the service of the academic and industrial communities through various actions :

  • Review of scientific articles
  • Expertise of Cifre grant applications to the ANRT
  • Expertise of ANR projects
  • Expertise of scientific projects for ADEME

In addition, thanks to the testing and characterisation resources available in the laboratory, the theme assists its industrial partners in assessing problematic situations. This approach allows for better control of the functionality of interfaces or their life span as well as better knowledge of the behaviour of the materials used.

Active groupes and projects :

  • GDR 2077 : SurfTopo - Surface Topography
  • Project ANR ASHENDO - Hygromechanical analysis of damage in multi-material assemblies : multiscale modelling and characterization.

Learned societies :

  • Association Française de Mécanique (AFM), including GST Tribologie
  • National Metallurgy Network (RNM)
  • French Society of Metallurgy and Materials
  • ARTEMA (mechatronics professionals’ union)
  • Association for Composite Materials (AMAC)
  • Society for the Advancement of Material and Process Engineering (SAMPE)

Closed groups and projects :

  • FUI MEKINOX : Mechanics of high performance martensitic stainless steels
  • FUI MAIAS : Control of damping in assemblies
  • ANR-RNMP-Nanoscam : Nanostructured coatings based on silicon and carbon for mechanical applications
  • GDR 0518 then 2345 : Static sealing by metallic seals operating under extreme conditions
  • Colloque Assemblages mécaniques 2021 : Bi-annual colloquium organized to exchange between industrialists and academics around the problems of mechanical assemblies (bolted, welded, glued, ...). This event brings together about 100 people at Supméca.
  • JIFT 2017 : Journées Internationales Francophones de Tribologie, an annual conference bringing together 80 to 100 participants to discuss recent developments in tribology. The organisation of this event is rotating (laboratories and research organisations). Proceedings of the days.

TEAM COMPOSITION

Full professor

Plasticity & Damage: modeling and experiment for conventional, ultrafine grained and nanocrystalline metals
Non-conventional energy dissipating systems
Multi-functional material foams

Professor Emeritus

Phone: 01 49 45 29 54
Mail: bayraktar@isae-supmeca.fr

Location ISAE-SUPMECA

Novel composites: recycled aluminium and rubber
Damage analyses
Sinter + Forging, Thixioforming

You can find me on google scholar

Assistant professor

Phone: 01 49 45 29 51
Mail: isabelle.lemaire@isae-supmeca.fr

Location ISAE-SUPMECA

Fretting
Damage
Surface treatment and coating

Assistant professor

Phone: 01 49 45 25 45
Mail: jean-philippe.crete@isae-supmeca.fr

Location ISAE-SUPMECA

Extended Finite Element Method (XFEM)
Viscoplasticity
Damage

Full professor

Phone: 01 49 45 29 16
Mail: tony.dasilva@isae-supmeca.fr

Location ISAE-SUPMECA

Responsible for the "Tribology and Materials" theme

Surface states
Plasticity
Contact Mechanics

Researchgate

Assistant professor

Phone: 01 49 45 29 52
Mail: julien.fortesdacruz@isae-supmeca.fr

Location ISAE-SUPMECA

Fretting
Tribometer design
Surface conditions

Researchgate

Full professor

Phone : 01 49 45 29 57
Mail: olga.klinkova@isae-supmeca.fr

Location ISAE-SUPMECA

Composites
Damage
Bonding

Researchgate

Assistant professor

Phone: 01 49 45 29 55
Mail: muriel.quillien@isae-supmeca.fr

Location ISAE-SUPMECA

Surface conditions
Contact mechanics
Sealing

Assistant professor

Phone: 01 49 45 29 34
Mail: maria-letizia.raffa@isae-supmeca.fr

Location ISAE-SUPMECA

Imperfect interface laws
Micromechanical modelling
Contact mechanics
Homogenisation and asymptotic theory

ResearchGate

Assistant professor

High performance computing
Simulation
Optimization

Full professor

Phone: 01 49 45 29 62
Mail: imad.tawfiq@isae-supmeca.fr

Location ISAE-SUPMECA

Composite materials
Structural dynamics
Finite element method

Jobs