基于Norton模型汽车轮毂热诱导长效蠕变分析

Analysis on Long-term Thermally Induced Creep Behavior for Automobile Hub Based on Norton Model

基于NAFEMS材料非线性基准,建立了在高温和内压作用下铝合金A356材质的汽车轮毂Norton热诱导长效蠕变模型。结果表明:蠕变松弛现象随着时间的推移从轮毂外半径向内半径传播,铝合金材质的汽车轮毂经历长时间的应力历史后,会发生蠕变行为;将汽车轮毂Norton蠕变模型仿真结果与相同高温和内压条件下汽车轮毂的应力和位移实验结果进行对比,验证该Norton蠕变模型对预测汽车轮毂热诱导长效蠕变行为的有效性。

According to NAFEMS material nonlinear benchmark, the long-term thermally induced creep model of A356 aluminum alloy automobile wheel hub was establishded based on Norton criterion under the role of high temperature and internal pressure. The simulation results show that the creep relaxation phenomena as time passes spreads from the outer radius of the hub into the hub＇s inner radius, and the creep behavior occurs when the aluminum alloy A356 automobile hub experiences a long history of the stress. The norton creep model simulation results of automotive wheel hub under the same conditions of high temperature and internal pressure stress. The displacement experimental results were compared by verifying the validity of the norton creep model prediction of automotive wheel heat-induced long-term creep behavior.