一种弯曲修正膜单元及对侧翻一步碰撞算法的改进

A Membrane Element Model with Bending Modification and Improvement to One-Step Algorithm for Rollover Collision

摘要:

针对传统四节点膜单元无法进行弯曲的缺陷，基于单元内力和弯矩的平衡原理，提出一种可进行弯曲修正的新型四节点膜单元模型，将其应用于客车侧翻一步碰撞算法，对初始算法进行改进。通过对典型车身段模型进行模拟，并与客车侧翻一步碰撞初始算法、LS-DYNA仿真及侧翻试验结果在计算精度和计算效率方面分别进行对比，检验了所提新型单元模型的有效性和实际工程应用价值。

Abstract:

In view of the defect that traditional four-node membrane element cannot bend， a novel four-node membrane element model with bending modification was proposed based on the equilibrium principle of element internal forces and bending moments. The new element is applied in the one-step algorithm for bus rollover collision to improve the initial algorithm. A case study on the rollover of a typical bus body section is conducted using the improved algorithm. The validity of the proposed improved element is examined by comparing the computational results of the improved algorithm with that of the original algorithm， LS-DYNA， and the rollover test on the side of computational efficiency and precision.