| 基于汽车碰撞仿真的点焊连接关系有限元模拟方法 |
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| 引用本文： | 施欲亮,朱平,沈利冰,林忠钦. 基于汽车碰撞仿真的点焊连接关系有限元模拟方法[J]. 机械工程学报, 2007, 43(7): 226-230 |
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| 作者姓名： | 施欲亮 朱平 沈利冰 林忠钦 |
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| 作者单位： | 上海交通大学机械与动力工程学院,上海,200240;上海交通大学机械与动力工程学院,上海,200240;上海交通大学机械与动力工程学院,上海,200240;上海交通大学机械与动力工程学院,上海,200240 |
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| 摘 要： | 针对现在一般汽车碰撞有限元模型采用刚性梁作为点焊连接关系的模拟方法，通过仿真计算和参数影响分析，发现网格大小以及刚性梁与相连平面的夹角对于点焊的失效时间有着很大的影响，采用刚性梁单元模拟点焊连接关系是不稳定、不可靠的。提出以不依赖网格节点的弹—塑性梁作为点焊连接的有限元模拟方法，并经过仿真结果对比，发现弹—塑性梁单元对小网格尺寸不敏感，对于点焊失效时间的模拟是稳定、可靠的，因而更加适合在汽车碰撞仿真中对点焊连接关系进行模拟。
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| 关 键 词： | 汽车碰撞仿真 点焊连接 有限元法 弹--塑性梁 |
| 修稿时间： | 2006-08-20 |
FINITE ELEMENT MODELING OF SPOT WELDS BASED ON VEHICLE IMPACT |
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| SHI Yuliang,ZHU Ping,SHEN Libing,LIN Zhongqin. FINITE ELEMENT MODELING OF SPOT WELDS BASED ON VEHICLE IMPACT[J]. Chinese Journal of Mechanical Engineering, 2007, 43(7): 226-230 |
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| Authors: | SHI Yuliang ZHU Ping SHEN Libing LIN Zhongqin |
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| Affiliation: | School of Mechanical Engineering, Shanghai Jiaotong University |
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| Abstract: | Considering the fact that spot-welds in most of the FE analyses of car crashes are modeled as a rigid beam,pa-rameter study is performed by using FE calculation.It is found that the failure time of a rigid beam is highly dependent on the mesh size and the angle between the beam element and the connected surfaces,which means it is instable and unreliable to model the spot-weld to the rigid beam.Then,a new simulation technique of the spot-welds is put forward by using an elas-tic-plastic beam,which is independent of nodes.After simulation comparison,the elastic-plastic beam turns up to be a more suitable method to simulate the behavior of the spot-welds because of its insensitivity to small mesh size and stability and reliability in predicting the failure time of the spot-weld. |
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| Keywords: | Vehicle crash simulation Spot-weld connection Finite element method Elastic-plastic beam |
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