Optimal crashworthiness design of a spot-welded thin-walled hat section

被引:99
作者
Xiang, Yujiang
Wang, Qian
Fan, Zijie
Fang, Hongbing [1 ]
机构
[1] Mississippi State Univ, Ctr Adv Vehicular Syst, Mississippi State, MS 39762 USA
[2] Univ Iowa, Ctr Comp Aided Design, Coll Engn, Iowa City, IA 52242 USA
[3] Tsinghua Univ, State Key Lab Automat Safety & Energy, Beijing 100084, Peoples R China
关键词
crashworthiness; optimization; spot-weld; thin-walled; hat sections; response surface methodology;
D O I
10.1016/j.finel.2006.01.001
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
In automotive industry, crashworthiness design is of special interest to ensure passengers safety and reduce vehicle costs. Thin-walled beams are the main energy absorbing structures in frontal and real collisions; therefore, it is important to investigate their energy-absorption and optimize their performance. For crashworthiness designs of thin-walled sections, much attention has been given to the size and shape designs of the cross-section, while limited study has been performed to incorporate spot-weld modelling and their numbers as design parameters in crashworthiness optimization. The spacing of spot-welds has a strong effect on crashworthiness performance, because it can change a single complete folding length. This study focuses on the optimal crashworthiness design of a spot-welded thin-walled hat section subject to an axial crushing force. Based on comparisons to experimental data, an appropriate spot-weld model is selected and used in numerical simulations. The mass of the beam is optimized subjected to constraints of required mean crushing force and bending stiffness. A "Two-step RSM-Enumeration" algorithm is employed to efficiently solve this optimization problem of mixed-type variables. (c) 2006 Elsevier B.V. All rights reserved.
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页码:846 / 855
页数:10
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