https://hal-mines-paristech.archives-ouvertes.fr/hal-03167574Ovalle, CCOvalleMAT - Centre des Matériaux - Mines Paris - PSL (École nationale supérieure des mines de Paris) - PSL - Université Paris sciences et lettres - CNRS - Centre National de la Recherche ScientifiqueBoisot, GuillaumeGuillaumeBoisotLaiarinandrasana, LucienLucienLaiarinandrasanaMAT - Centre des Matériaux - Mines Paris - PSL (École nationale supérieure des mines de Paris) - PSL - Université Paris sciences et lettres - CNRS - Centre National de la Recherche ScientifiqueHeat build-up of semi-crystalline polymers under monotonic loading : effects of stress triaxiality ratioHAL CCSD2020[SPI.MAT] Engineering Sciences [physics]/Materials[SPI.MECA.MEMA] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]OVALLE, Cristian2021-03-30 18:55:072022-10-22 05:15:282021-03-30 18:55:07enConference papers1The conversion of plastic work into dissipative heat, leading to an adiabatic heat build-up, is a well-known phenomenon. In polymers, the heat build-up depends on the strain rate [1], on the maximum strain [2] and, obviously, on the geometry of the test sample [3]. Even though the ambient testing temperature is lower than the glass transition temperature Tg, the temperature in the vicinity of a crack tip due to heat build-up may be exceptionally high so that it can locally reach Tg. A significant alteration of the local material response and damage mechanisms is then induced. In the present study, a thermo-mechanical constitutive model, integrating temperature-dependent coefficients, has been developed. Predictive capabilities of the proposed thermo-mechanical model to simulate the isothermal behaviour of PolyAmide 11 (PA11) have led to adiabatic simulations, to account for the heat build-up highlighted experimentally, of ductile crack extension. The model parameters were identified using experimental data obtained from PA11 samples with a given stress triaxiality ratio. Predicted evolutions given by the proposed constitutive model for other stress triaxiality ratios will be discussed.[1] A. Lion. On the large deformation behaviour of reinforced rubber at different temperatures. Journal of the Mechanics and Physics of Solids, 45(11):1805 – 1834, 1997.[2] C. Ovalle, F. Zaïri, M. Naït-Abdelaziz, and P. Charrier. A thermo-visco-hyperelastic model for the heat build-up during low-cycle fatigue of filled rubbers: Formulation, implementation and experimental verification. International Journal of Plasticity, 79:217 – 236, 2016.[3] Q. Guo, F. Zaïri, C. Ovalle, and X. Guo. Constitutive modeling of the cyclic dissipation in thin and thick rubber specimens. ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift fur Angewandte Mathematik und Mechanik, 98(10):1878–1899, 2018.