锥形薄壁梁斜向耐撞性优化设计仿真研究

doi:10.16731/j.cnki.1671-3133.2017.05.025

现代制造工程 ›› 2017, Vol. 440 ›› Issue (5): 139-145.doi: 10.16731/j.cnki.1671-3133.2017.05.025

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锥形薄壁梁斜向耐撞性优化设计仿真研究

张文强, 张维刚, 唐涛, 陈鼎

湖南大学汽车车身先进设计制造国家重点实验室,长沙 410082

收稿日期:2016-05-03 出版日期:2017-05-20 发布日期:2018-01-08
作者简介:张文强,硕士研究生,主要从事汽车安全性方面研究。张维刚,博士,教授,主要研究方向为汽车碰撞安全性设计理论与方法。唐涛,硕士研究生。陈鼎,硕士研究生。E-mail:wenqiang19910628@163.com
基金资助:
国家自然科学基金资助项目(51275164)

Simulation and optimization design of oblique crashworthiness of tapered thin-walled structures

Zhang Wenqiang, Zhang Weigang, Tang Tao, Chen Ding

State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,
Hunan University,Changsha 410082,China

Received:2016-05-03 Online:2017-05-20 Published:2018-01-08

摘要/Abstract

摘要： 由于薄壁结构具有低成本和高能量吸收效率的特点,被广泛地应用在汽车车身上。在碰撞载荷作用下,薄壁结构有3种变形形式,即渐进压溃、欧拉变形和混合变形模式,其中最利于吸能的变形形式是渐进压溃,一般在纯轴向载荷中出现。实际交通事故情况复杂,斜向撞击更为普遍,由此导致的欧拉变形时常发生。研究目的就是提高薄壁结构在轴向和斜向碰撞下的耐撞性。首先选取7种不同截面型式薄壁锥形梁,通过改变斜向冲击的夹角,计算得到不同结构型式的比吸能(SEA)。对7种截面型式的薄壁结构进行夹角为0°、15°和30°载荷工况的碰撞仿真,对比其性能表现,选取耐撞性最佳的结构。在此基础上,以SEA为优化目标,以碰撞峰值力F_max为约束,通过0°、15°和30°的工况的有限元仿真,利用代理模型的方法寻找该结构的最优参数,最终得到的优化结构斜向耐撞性得到大幅度提升。

关键词: 锥形薄壁梁, 斜向碰撞, 截面形状, 代理模型, 耐撞性优化

Abstract: Thin-walled tubes are widely used in vehicle bodies because of their low costs and high energy absorption capacities.Under impact loading,tubular structures may deform in three modes:progressive buckling,euler-type buckling or dynamic plastic buckling,among which the progressive deformation usually occurs in pure axial loading is the best for energy absorption.In an actual accident,oblique impact is more common and euler-type buckling happens frequently.Aims to enhance the crashworthiness of thin-walled tubes in both axial and oblique impacts.Firstly,7 kinds of tubes with different cross-sections were investigated under different impact angles,and the Specific Energy Absorption(SEA) was evaluated.By simulating the 0,15 and 30 degrees impact,the best tube with regard to crashworthiness was chosen for further optimization.Then,taking the SEA as the objective function and the maximum impact force F_max as constraint,the tube’s parameters were optimized by using metamodel method.Finally,the optimization result is achieved and the tube’s crashworthiness in oblique impact is greatly improved.

Key words: tapered thin-walled structure, oblique impact, cross-section shape, metamodel, crashworthiness optimazition

中图分类号:

U461.91

张文强, 张维刚, 唐涛, 陈鼎. 锥形薄壁梁斜向耐撞性优化设计仿真研究[J]. 现代制造工程, 2017, 440(5): 139-145.

Zhang Wenqiang, Zhang Weigang, Tang Tao, Chen Ding. Simulation and optimization design of oblique crashworthiness of tapered thin-walled structures[J]. Modern Manufacturing Engineering, 2017, 440(5): 139-145.

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锥形薄壁梁斜向耐撞性优化设计仿真研究

Simulation and optimization design of oblique crashworthiness of tapered thin-walled structures

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