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About the stress triaxiality ratio effects on the heat build-up of PolyAmide 11 under monotonic loading

Abstract : Heat build-up in polymers throughout mechanical loading, associated with the partial conversion of plastic work into dissipative heat, could dramatically affect the mechanical response of the material [1]. Therefore, the temperature rise in the vicinity of a crack tip due to heat build-up may be exceptionally high so that it can locally reach the glass transition temperature Tg, even though the ambient testing temperature is lower than Tg. A significant alteration of the local material response and damage mechanisms is then expected. However, the effects of the stress triaxiality ratio on the heat build-up still unknown. In this study, a Gurson-Tvergaard-Needleman based thermo-mechanical model [2], integrating temperature-dependent coefficients, was extended to include the plastic work, by means of the Taylor-Quinney factor, to predict the adiabatic heat build-up with deformation. The model parameters were identified using experimental data obtained on a PolyAmide 11 (PA11) by simultaneous measurement of temperature during experimental tests under quasi-static loading with a given stress triaxiality ratio. Predictive capabilities of the thermo-mechanical GTN-based model to simulate the isothermal behaviour of PA11 led to numeric simulations, to account for the adiabatic heat build-up highlighted experimentally, of ductile crack extension. Predicted evolutions given by the proposed constitutive model for other stress triaxiality ratios and geometries are found to be in good agreement with experimental data [3]. [1] D. Rittel. On the conversion of plastic work to heat during high strain rate deformation of glassy polymers. Mechanics of Materials, 31(2):131 – 139, 1999. [2] L. Laiarinandrasana, J. Besson, M. Lafarge, and G. Hochstetter. Temperature-dependent mechanical behaviour of pvdf: Experiments and numerical modelling. International Journal of Plasticity, 25(7):1301 – 1324, 2009. [3] C. Ovalle, G. Boisot, and L. Laiarinandrasana. Effects of stress triaxiality ratio on the heat build-up of polyamide 11 under loading. Mechanics of Materials, 145:103375, 2020.
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Contributor : Cristian Ovalle Connect in order to contact the contributor
Submitted on : Tuesday, January 4, 2022 - 10:36:11 AM
Last modification on : Thursday, January 6, 2022 - 3:43:47 AM

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  • HAL Id : hal-03509404, version 1

Citation

C Ovalle, Guillaume Boisot, Lucien Laiarinandrasana. About the stress triaxiality ratio effects on the heat build-up of PolyAmide 11 under monotonic loading. 30ème Colloque national sur la DEformation des Polymères Solides - DEPOS30, Sep 2021, La Napoule, Alpes-Maritimes, France. ⟨hal-03509404⟩

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