Toughening Mechanism Analysis of Recycled Rubber Based Composites Reinforced with Glass Bubbles, Glass Fibers and Alumina Fibers

Thèse de ÇAKIR KABAKCI Gamze

Cadre : Atilim University/TUBITAK Research Centre - Ankara-TURKEY, sous la Direction de Prof. BAYRAKTAR Emin et Prof. Özgür ASLAN, Cergy University, Inscrit à l’Ecole Doctorale Sciences et Ingénierie (ED n°417)

Recycled rubber is one of the most commonly used recyclable materials in a number of industries, including automotive and aeronautic because of their low weight and cost efficiency. In this research, devulcanized recycled rubber based composites are designed with glass bubble microsphere and fine gamma alumina fiber (g-Al2O3) reinforcements. After the determination of the reinforcements with matrix, bending strength and fracture characteristics of the composite are investigated by static and cyclic three-point bending (3PB) tests. Halpin–Tsai homogenization model is adapted to the rubber-based composites to estimate the moduli of the composites. Furthermore, the relevant toughening mechanisms for the most suitable reinforcements are analyzed and stress intensity factor, KIc and critical energy release rate, GIc in mode I are determined by 3PB test with single edge notch specimens. In addition, 3PB tests are simulated by finite element analysis and the results are compared with the experimental results. Microstructural and fracture surfaces analysis are carried out by means of scanning electron microscopy (SEM).