新型DKT组合薄壳单元及对侧翻一步碰撞算法的改进

doi:10.19562/j.chinasae.qcgc.2021.07.019

摘要/Abstract

摘要：

针对客车侧翻有限元分析过程中部分单元翘曲的问题，首先对四节点薄壳单元进行翘曲修正改进。基于改进后的四节点薄壳单元和全量应变理论，将DKT四节点薄板单元和传统四节点等参膜单元组合，构造一种新型四节点DKT组合薄壳单元。接着，用该单元替代客车侧翻一步碰撞初始算法的四节点Mindlin壳单元，并对初始算法进行改进。最后，应用改进算法对某12 m公路客车典型车身段模型进行侧翻模拟，并与初始算法、LS?DYNA和实车侧翻试验结果对比，验证了所提出的新型四节点DKT组合薄壳单元在实际工程应用的有效性。

关键词: 客车侧翻, 翘曲修正, 新型DKT组合薄壳单元, 一步碰撞算法, 全量应变理论

Abstract:

Aiming at the warping problem of some elements in the finite element analysis of bus rollover， the four?node thin shell element is improved with warp correction first. Based on the improved four?node thin shell element and the total strain theory， a new type of four?node DKT combined thin shell element is constructed by combining the DKT four?node thin plate element with the traditional four?node isoparametric membrane element. Then the four?node Mindlin shell element used in the one?step collision initial algorithm for bus rollover is replaced by the new DKT element， with the initial algorithm improved. Finally， the improved algorithm is applied to the rollover simulation of the typical body section model for a 12m highway bus and its result is compared with those of initial algorithm， LS?DYNA and real bus rollover test， verifying the effectiveness of the constructed new type of four?node DKT combined thin shell element in practical engineering application.

Key words: bus rollover, wrap modification, new type of DKT combined thin shell element, one?step collision algorithm, total strain theory

王童,陈轶嵩,刘永涛. 新型DKT组合薄壳单元及对侧翻一步碰撞算法的改进[J]. 汽车工程, 2021, 43(7): 1113-1120.

Tong Wang,Yisong Chen,Yongtao Liu. New Type of DKT Combined Thin Shell Element and the Improvement of the One⁃step Collision Algorithm for Rollover[J]. Automotive Engineering, 2021, 43(7): 1113-1120.

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试验状态	质量/kg	质心位置/m
试验状态	质量/kg	X方向	Y方向	Z方向
空骨架	706	1.059	0.003	1.388
配重后	2 409	0.937	0.012	1.473

测点序号	改进算法		初始算法		LS?DYNA		侧翻试验
测点序号	封闭环①	封闭环②	封闭环①	封闭环②	封闭环①	封闭环②	封闭环①	封闭环②
1	63	68	60	64	65	70	80	80
2	76	84	75	80	78	83	90	90
3	89	94	87	93	90	94	105	100
4	102	106	100	105	105	108	115	110
5	122	125	121	123	125	127	125	120
6	138	141	138	140	142	143	130	130
7	126	127	125	128	126	129	120	145
8	106	111	105	110	108	112	110	130
9	91	97	90	96	93	99	100	120
10	80	85	79	85	82	88	85	105
11	71	78	71	77	74	80	70	85