汽车碰撞仿真中沙漏控制算法研究  

A Study on the Control of Hourglass Modes in Vehicle Crash Simulation

作　　者：高晖[1] 李光耀[1] 

机构地区：[1]湖南大学,汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《汽车工程》2008年第8期671-675,699,共6页Automotive Engineering

基　　金：国家自然科学基金重点项目(60635020);教育部新世纪优秀人才支持计划(NCET-04-0766)资助

摘　　要：在汽车碰撞计算机仿真中一点积分壳单元的沙漏控制对计算的稳定性和结果的准确性有着特别重要的影响。在非翘曲影响域概念的基础上提出了一个新的沙漏控制策略,与单元非线性应力应变相关的计算只在非翘曲影响域中进行,以克服大翘曲构型中计算不稳定和不精确的缺点。理论分析表明该方法的精度介于一点积分和全积分之间,对于翘曲小的单元该方法等同于全积分计算方法。It is particularly important to suppress the hourglass modes of one-point quadrature shell ele- ments in vehicle crash simulation. In this paper a new hourglass control strategy is proposed based on a concept of ＇ non-warping-affected domain＇ （NWAD） introduced. The computations related to the nonlinear stress and strain ofelements are conducted only in NWAD, so as to overcome the shortcoming of instability and inaccuracy in the calculation of highly warped shell element. Theoretical analysis shows that the accuracy of this method is between onepoint quadrature and full integration. For fiat element with minor warping, the method is in the same way as full integral calculation.

关 键 词：汽车碰撞 壳单元 沙漏控制 翘曲 

分 类 号：U467.14[机械工程—车辆工程] TP273[交通运输工程—载运工具运用工程]