Dynamic crashing behavior of new extrudable multi-cell tubes with a functionally graded thickness

Fang, J; Gao, Y; Sun, G; Zheng, G; Li, Q

Dynamic crashing behavior of new extrudable multi-cell tubes with a functionally graded thickness

Fang, J

Gao, Y Sun, G Zheng, G Li, Q

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Publication Type:: Journal Article
Citation:: International Journal of Mechanical Sciences, 2015, 103 pp. 63 - 73
Issue Date:: 2015-11-01

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Field	Value	Language
dc.contributor.author	Fang, J https://orcid.org/0000-0003-0119-6108	en_US
dc.contributor.author	Gao, Y	en_US
dc.contributor.author	Sun, G	en_US
dc.contributor.author	Zheng, G	en_US
dc.contributor.author	Li, Q	en_US
dc.date.issued	2015-11-01	en_US
dc.identifier.citation	International Journal of Mechanical Sciences, 2015, 103 pp. 63 - 73	en_US
dc.identifier.issn	0020-7403	en_US
dc.identifier.uri	http://hdl.handle.net/10453/119279
dc.description.abstract	© 2015 Published by Elsevier Ltd. Multi-cell structures have been extensively studied for their outstanding performance as potential energy absorbers. Unlike existing multi-cell tubes with a uniform thickness (UT), this paper introduces a functionally graded thickness (FGT) to multi-cell tubes under dynamic impact, which can be fabricated by an extrusion process. A numerical model is first established using the nonlinear finite element analysis code LS-DYNA and validated with experimental data. Based on a numerical study, the thickness gradient parameters in different regions have considerable effects on the crashworthiness of the FGT multi-cell tubes. Moreover, the FGT multi-cell tubes are able to absorb more energy while yielding a similar level of peak impact force to the UT multi-cell tubes. Finally, multiobjective optimizations of the UT and FGT multi-cell tubes are then performed to determine the optimal gradient parameters that simultaneously improve the specific energy absorption (SEA) and reduce the maximum impact force. In these optimizations, the multiobjective particle optimization (MOPSO) algorithm and response surface (RS) surrogate modeling technique are adopted. The optimization results demonstrate that the FGT multi-cell tubes produce more competent Pareto solutions than the conventional UT counterparts; similar gradients in the outer walls and stronger internal ribs are recommended for the FGT multi-cell tubes because of their improved interactions.	en_US
dc.relation.ispartof	International Journal of Mechanical Sciences	en_US
dc.relation.isbasedon	10.1016/j.ijmecsci.2015.08.029	en_US
dc.subject.classification	Mechanical Engineering & Transports	en_US
dc.title	Dynamic crashing behavior of new extrudable multi-cell tubes with a functionally graded thickness	en_US
dc.type	Journal Article
utslib.citation.volume	103	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0902 Automotive Engineering	en_US
utslib.for	0910 Manufacturing Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	103	en_US

Abstract:

© 2015 Published by Elsevier Ltd. Multi-cell structures have been extensively studied for their outstanding performance as potential energy absorbers. Unlike existing multi-cell tubes with a uniform thickness (UT), this paper introduces a functionally graded thickness (FGT) to multi-cell tubes under dynamic impact, which can be fabricated by an extrusion process. A numerical model is first established using the nonlinear finite element analysis code LS-DYNA and validated with experimental data. Based on a numerical study, the thickness gradient parameters in different regions have considerable effects on the crashworthiness of the FGT multi-cell tubes. Moreover, the FGT multi-cell tubes are able to absorb more energy while yielding a similar level of peak impact force to the UT multi-cell tubes. Finally, multiobjective optimizations of the UT and FGT multi-cell tubes are then performed to determine the optimal gradient parameters that simultaneously improve the specific energy absorption (SEA) and reduce the maximum impact force. In these optimizations, the multiobjective particle optimization (MOPSO) algorithm and response surface (RS) surrogate modeling technique are adopted. The optimization results demonstrate that the FGT multi-cell tubes produce more competent Pareto solutions than the conventional UT counterparts; similar gradients in the outer walls and stronger internal ribs are recommended for the FGT multi-cell tubes because of their improved interactions.

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http://hdl.handle.net/10453/119279