摘要
根据薄壁梁的轴向压溃和弯曲的基本理论,获取了薄壁梁的刚度特性。采用6自由度非线性弹簧单元和它与梁单元的组合分别代替原方管轴向压溃和弯曲有限元模型中壳单元的分析结果表明,它们能较好地模拟薄壁梁的碰撞变形过程。然后,将其用于建立某轿车前舱结构的梁板混合分析模型,分别用梁板混合模型和原板壳详细模型进行正面碰撞仿真,结果对比表明梁板混合模型不但能和板壳模型同样好地预测轿车的正面碰撞性能,而且可缩减约85%的仿真时间。
Based on the basic theory of axial and bending collapse mechanism of thin-walled beam,its stiffness characteristics are evaluated.The 6-DOF nonlinear spring element and its combination with beam element are used respectively to replace the shell elements in original square tube axial and bending collapse FE model in analysis with a result showing their capability in simulating the deformation process of thin-walled beam in crash.Then they are applied to establish the beam/shell mixed model for the front-end structure of a car.Frontal crash simulation is carried out with the beam/shell mixed model and original sole shell detailed model respectively.The comparison of results indicates that the beam/shell mixed model can not only predict the frontal crashworthiness of car equally well as shell detailed model but also reduce the simulation time by some 85%.
出处
《汽车工程》
EI
CSCD
北大核心
2011年第8期657-663,共7页
Automotive Engineering
基金
国家重点基础研究发展计划(2011CB711203)资助
