Characterization of Thermo-Mechanical and Fracture Behaviors of Thermoplastic Polymers
Elhem Ghorbel,
Ismail Hadriche,
Giuseppe Casalino,
Neila Masmoudi
Affiliations
Elhem Ghorbel
Laboratory of Mechanics and Materials of the Civil Engineering (L2MGC-EA4114), University of Cergy Pontoise, 5 mail Gay-Lussac, Neuville sur Oise, Cergy Pontoise Cedex 95031, France
Ismail Hadriche
Laboratory of Mechanics and Materials of the Civil Engineering (L2MGC-EA4114), University of Cergy Pontoise, 5 mail Gay-Lussac, Neuville sur Oise, Cergy Pontoise Cedex 95031, France
Giuseppe Casalino
Department of Mechanics Management and Mathematics (DMMM), Politecnico di Bari, Viale Japigia, 182, Bari 70126, Italy
Neila Masmoudi
Electromechanical Systems Laboratory (LASEM-LR99ES36), National Engineering School of Sfax, University of Sfax, Cité El Habib BP29, Sfax 3052, Tunisia
In this paper the effects of the strain rate on the inelastic behavior and the self-heating under load conditions are presented for polymeric materials, such as polymethyl methacrylate (PMMA), polycarbonate (PC), and polyamide (PA66). By a torsion test, it was established that the shear yield stress behavior of PMMA, PC, and PA66 is well-described by the Ree-Eyring theory in the range of the considered strain rates. During the investigation, the surface temperature was monitored using an infrared camera. The heat release appeared at the early stage of the deformation and increased with the strain and strain rate. This suggested that the external work of deformation was dissipated into heat so the torsion tests could not be considered isothermal. Eventually, the effect of the strain rate on the failure modes was analyzed by scanning electron microscopy.
