作　　者： (）;

机构地区： 华南理工大学机械与汽车工程学院广东省汽车工程重点实验室

出　　处： 《汽车技术》 2020年第4期57-62,共6页

摘　　要： 以某车型的行李箱支承作为研究对象,考虑内饰部件与毛毡接触的非刚性行为与相应材料的累积损伤特性,对其进行了有限元仿真和结构优化。通过热压试验获得毛毡与部件接触处的载荷-位移曲线,采用与毛毡刚度等效的弹簧元件模拟毛毡对部件的作用,应用累积损伤失效模型模拟部件的开裂行为,其中损伤的起始判据为韧性准则,损伤后的演化准则采用基于应力软化的准则。优化后部件质量增加2.2%,承载能力提高129.6%,预测结果与测试结果符合性较好。 Finite element simulation and structural optimization are carried out with the trunk support as the research object,considering the non-rigid behavior of the interior part in contact with the felt structure and the progressive damage characteristics of the corresponding material.The load-displacement curve at the place where the felt is in contact with the component is obtained by a hot press test,and a spring element equivalent to the felt in rigidity is used to simulate the effect of the felt on the component.The progressive damage failure model is used to simulate the cracking behavior of the component.The initial criterion of damage is the ductile criterion,and the evolution criterion after damage is based on the criterion of stress softening.After optimization,the weight of the parts is increased by 2.2%,while the load carrying capacity is increased by 129.6%.The predicted results and the test results are in good agreement.

关 键 词： 结构优化 弹塑性 累积损伤失效模型 弹性约束 有限元分析

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