| 摘 要： | 汽车动力总成悬置在正面碰撞中对纵梁变形模式有着重要影响。为准确预测悬置的碰撞断裂失效行为,开展了铸铝材料的力学性能试验。基于Crach FEM韧性失效准则,建立带有失效准则的铸铝材料卡片,通过对悬置支架的落锤冲击试验和模...展开更多
汽车动力总成悬置在正面碰撞中对纵梁变形模式有着重要影响。为准确预测悬置的碰撞断裂失效行为,开展了铸铝材料的力学性能试验。基于Crach FEM韧性失效准则,建立带有失效准则的铸铝材料卡片,通过对悬置支架的落锤冲击试验和模拟对标,验证了铸铝材料卡片的准确性和悬置建模方法的可靠性。整车碰撞仿真结果表明,Crach FEM失效模型能准确模拟悬置断裂失效过程,使纵梁变形模式和车身加速度响应更贴合试验结果,提高汽车动力总成碰撞仿真的精度,为碰撞性能开发提供仿真评估手段。收起
Vehicle engine mounts have crucial influence on side rail deformation in frontal impact.In order to correctly predict the fracture failure behavior of engine mounts,a mechanical property test on cast aluminum material is conducted.Cast aluminum material card with failur...MORE
Vehicle engine mounts have crucial influence on side rail deformation in frontal impact.In order to correctly predict the fracture failure behavior of engine mounts,a mechanical property test on cast aluminum material is conducted.Cast aluminum material card with failure criteria is set up based on CrachFEM tenacity failure criteria.Through the drop hammer test and simulation,the correctness of cast material card and the reliability of engine mounts modeling are verified.The results of vehicle crash simulation show that CrachFEM failure model can accurately simulate the fracture failure process of engine mounts,enable the deformation mode of side rail and the acceleration responses of car body closer to test results and enhance the accuracy of engine crash simulation,providing simulation assesement means for crashworthiness development.FEWER
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