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Published in: Structural and Multidisciplinary Optimization 2/2020

07-03-2020 | Industrial Application Paper

Crashworthiness optimisation for the rectangular tubes with axisymmetric and uniform thicknesses under offset loading

Authors: Kai Xu, Ping Xu, Chengxing Yang, Tiantian Wang, Benhuai Li, Quanwei Che, Shuguang Yao, Qi Huang

Published in: Structural and Multidisciplinary Optimization | Issue 2/2020

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Abstract

This study is aimed to compare and optimise the crashing performances of an axisymmetric rectangular tube (ART) and a uniform thickness tube (UTT) under offset loading. Both ART and UTT are strengthened with diaphragms. Numerical simulations for the initial UTT with diaphragms under offset loading were firstly performed based on the experimentally validated finite element model (FEM), which illustrated that deformation process varied from stable mode to bending-sliding mode with an increase offset distance of 0–60 mm. Then, design of experiment (DOE) method was employed to determine the design domains of UTT and ART under various offset distances. Based on the results of DOE, three deformation regions were identified and parametric studies showed that the thicknesses of tubes and diaphragms had significant effects on their crashing performances. Subsequently, the irregular design domains derived from the impact condition with offset distance of 45 mm were selected to search the optimal thickness configurations of both UTT and ART. Finally, the multi-objective optimisation (MOD) was conducted by using non-dominated sorting genetic algorithm (NAGA-II) to minimise the initial peak crushing force (IPCFd) and maximise the specific energy absorption (SEAd) under multiple offset loadings. The obtained Pareto fronts showed that ART generally achieved higher IPCFd and SEAd; however, ART outperformed UTT for both IPCFd and SEAd in certain design domains. The outcomes provide insights into the design and selection of thin-walled structures for engineering applications.

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Appendix
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Metadata
Title
Crashworthiness optimisation for the rectangular tubes with axisymmetric and uniform thicknesses under offset loading
Authors
Kai Xu
Ping Xu
Chengxing Yang
Tiantian Wang
Benhuai Li
Quanwei Che
Shuguang Yao
Qi Huang
Publication date
07-03-2020
Publisher
Springer Berlin Heidelberg
Published in
Structural and Multidisciplinary Optimization / Issue 2/2020
Print ISSN: 1615-147X
Electronic ISSN: 1615-1488
DOI
https://doi.org/10.1007/s00158-020-02535-1

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