Abstract: In order to predict the crash fracture behavior of wheel hubs precisely， the material fracture mechanics tests for AlSi7（casting aluminum） were carried out and material characterization parameter fitting method was studied based on CrachFEM failure criterion. Modeling rules of finite element and methods of material failure parameter modification suitable for wheel hub fracture simulation were proposed，the simulation results of crash fracture mode for wheel hubs are more consistent with the test results according to the comparative analysis of quasi-static and dynamic tests and simulations for wheel hubs. The results show that the accuracy of crash fracture simulation is improved after using the proposed modeling rules and methods， which may provide effective method of virtual simulation evaluation for small overlap crashs.

Key words: casting aluminum wheel hub, crash fracture prediction, CrachFEM failure criterion, simulation accuracy

摘要： 为准确地模拟轮毂的碰撞断裂失效行为，开展了AlSi7（铸铝）材料的断裂力学试验，基于CrachFEM失效准则研究了材料特性参数拟合方法。根据轮毂的准静态和动态试验与仿真对比分析，提出了适用于轮毂断裂模拟的有限元建模规则和材料失效参数调整方法，使轮毂碰撞断裂模式的仿真结果更贴合试验结果。研究结果表明：利用所提建模规则与方法显著提高了碰撞模拟的失效预测精度，可为小偏置碰的安全性能开发提供有效的虚拟仿真评估手段。

关键词: 铸铝轮毂, 碰撞断裂预测, CrachFEM失效准则, 仿真精度