极端温度下气囊爆破仿真中内饰件材料性能测试与建模

摘要

文章针对安全气囊子系统爆破问题,为解决塑料材料在极端温度下高速拉伸设备受限、高速材料参数难以获取以及缺乏准确材料模型进行描述的问题,提出通过测量样条在不同测试速度下的横梁位移、使用横梁位移计算材料应变率对于曲线中应力水平的放大作用、使用Coper-Symonds方程对应变率效应参数进行拟合的方法,建立了材料在极端温度和高应变率耦合环境下的力学性能试验及参数处理方法,最后通过仿真及对标验证,确保方法的有效性.%Aimed at airbag system blasting problem, in order to overcome difficulty of obtaining accurate material model resulting from limited capability of high speed stretch test equipment under extreme temperature condition, material mechanical model in the coupled condition of extreme temperature and material mechanical model in the coupled condition of extreme temperature and high speed strain rated by way of measuring beam displacement in different deformation speed are built, strain rate effect on the material strain-stress curve which significantly amplify the material stress level is calculated, fitting of strain rate parameter with Coper-Symonds equation is conducted. Finally, through simulation and benchmarking, the effectiveness of the method is ensured.