子结构方法在汽车约束系统固定点强度模拟中的应用

Application of substructure method in anchorage strength simulation of automotive restraint system

研究PAM-CRASH显示求解器子结构方法在汽车约束系统固定点强度模拟中的可行性和可靠性.合理定义子结构边界条件,建立子结构简化模型,单元数目极大地减少.与整体模型的计算结果进行比较发现,二者在局部塑性应变和固定点变形量方面差别不大,但采用子结构方法能极大地缩减CPU计算时间.因此,采用子结构方法模拟计算约束系统固定点强度可行.该方法能在保证计算精度的同时,极大地提高计算效率.

The feasibility and reliability of substructure method in PAM-CRASH explicit solver is researched, which is applied to automotive restraint system anchorage strength simulation. A simplified substructure model is built by a correct substructure boundary definition, which reduces the element quantity significantly. The calculation results of whole model and substructure model are compared, and there is little difference in local plastic strain and anchorage deformation between the two models. But the CPU calculation time is reduced greatly by substructure model. The simulation and calculation on automotive restraint system anchorage strength by substructure method is feasible. The method can significantly improve the calculation efficiency while ensuring calculation accuracy.