Abstract Adiabatic heat build-up in polymers attributed to the conversion of plastic work into dissipative heat is a well known phenomenon. The temperature 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 induced. By simultaneous measurement of temperature during experimental tests under quasi-static loading and for a wide range of stress triaxiality ratios, a Gurson-Tvergaard-Needleman based 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 and geometries are found to be in good agreement with experimental data.

中文翻译：

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应力三轴比对PolyAmide 11负载热积聚的影响

摘要 由于塑性功转化为耗散热，聚合物中的绝热热积聚是众所周知的现象。由于热量积聚，裂纹尖端附近的温度可能会异常高，因此它可以局部达到玻璃化转变温度 Tg，即使环境测试温度低于 Tg。然后引起局部材料响应和损伤机制的显着改变。通过在准静态载荷和大范围应力三轴度比的实验测试过程中同时测量温度，开发了基于 Gurson-Tvergaard-Needleman 的热机械本构模型，集成了温度相关系数。所提议的热机械模型模拟聚酰胺 11 (PA11) 的等温行为的预测能力已经导致绝热模拟，以解释实验中突出显示的热积聚，延性裂纹扩展。使用从具有给定应力三轴度比的 PA11 样品获得的实验数据确定模型参数。发现由建议的本构模型给出的其他应力三轴度比和几何形状的预测演变与实验数据非常吻合。