车用ABS温相关本构模型及材料参数的确定

Temperature-dependent mechanical behavior of ABS in automobiles:Constitutive model and material parameters

通过不同温度下(243K、263K、296K、333K、353K和383K)的单向拉伸试验,研究了温度对玻璃态和玻璃化转变区的丙烯腈-丁二烯-苯乙烯三元共聚物(ABS)力学性能的影响。结果表明:在低于玻璃化转变温度(383K)的范围内,屈服强度和极限拉伸强度随温度的升高呈线性下降;杨氏模量随温度的上升呈非线性下降。本文结合双层黏塑性本构模型,利用sim-flow优化工具获取本构模型在不同温度下的材料参数,建立了温相关双层黏塑性本构模型,该本构模型可以很好地预测ABS在243～383K范围内的应力-应变曲线。

An experimental study of temperature-dependent mechanical behavior of acrylonitrile butadiene styrene（ABS）was performed at a range of temperatures（243 K,263 K,296 K,333 K,353 K,383 K）under uniaxial tension condition.In this temperature range,ABS was in the glass state and glass transition region.The results show that the yield stress and ultimate tensile stress decrease linearly but Young＇s modulus decreases nonlinearly with the increase of temperature.The material parameters of the model at different temperature were obtained by using a sim-flow optimization tool.The temperature-dependent two-layer viscoplasticity constitutive model was established.This constitutive model can predict the stress-strain curve of ABS well at different temperatures between 243 Kand383 K.