期刊
THIN-WALLED STRUCTURES
卷 94, 期 -, 页码 334-347出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2015.04.030
关键词
Functionally graded thickness; Foams; Optimization; Crashworthiness; Oblique load
资金
- National Natural Science Foundation of China [61232014, 11202072]
- Ministry of Education of China [20120161120005]
- Hunan Provincial Science Foundation of China [13JJ4036]
This paper provides a comparative study on the crashworthiness of different functionally-graded thin-wall tubes under multiple loading angles, which include hollow uniform thickness (H-UT), hollow functionally graded thickness (H-FGT), foam-filled uniform thickness (F-UT) and foam-filled functionally graded thickness (F-FGT) configurations. First, finite element analyses of these differently graded circular tubes reveal that the F-FGT tube has the best crashworthiness under multiple loading angles. Second, parametric study on the F-FGT tube indicates that the thickness gradient and variation range significantly influence its crashworthiness. Third, the Non-dominated Sorting Genetic Algorithm (NSGA-II) is used to optimize the F-FGT tube, in which the optimal thickness variation is sought for maximizing specific energy absorption (SEA) and minimizing initial peak force (IPF) under multiple loading angles. The optimized F-FGT tube exhibits better crashworthiness than other three equivalent tube configurations, indicating that the F-FGT tube can be a potential energy absorber when oblique impact loading is inevitable. (C) 2015 Elsevier Ltd. All rights reserved.
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