Contrastive analysis and crashworthiness optimization of two composite thin-walled structures
来源期刊：中南大学学报(英文版)2014年第11期
论文作者：XIE Su-Chao(谢素超) 周辉 梁习锋 REN Xin(任鑫)
文章页码：4386 - 4394
Key words：contrastive analysis; crashworthiness optimization; composite structure; Kriging surrogate model; finite element analysis
Abstract: For the safety protection of passengers when train crashes occur, special structures are crucially needed as a kind of indispensable energy absorbing device. With the help of the structures, crash kinetic-energy can be completely absorbed or dissipated for the aim of safety. Two composite structures (circumscribed circle structure and inscribed circle structure) were constructed. In addition, comparison and optimization of the crashworthy characteristic of the two structures were carried out based on the method of explicit finite element analysis (FEA) and Kriging surrogate model. According to the result of Kriging surrogate model, conclusions can be safely drawn that the specific energy absorption (SEA) and ratio of specific energy absorption to initial peak force(REAF) of circumscribed circle structure are lager than those of inscribed circle structure under the same design parameters. In other words, circumscribed circle structure has better performances with higher energy-absorbing ability and lower initial peak force. Besides, error analysis was adopted and the result of which indicates that the Kriging surrogate model has high nonlinear fitting precision. What is more, the SEA and REAF optimum values of the two structures have been obtained through analysis, and the crushing results have been illustrated when the two structures reach optimum SEA and REAF.
XIE Su-Chao(谢素超)1, ZHOU Hui(周辉)1, 2, LIANG Xi-feng(梁习锋)1, REN Xin(任鑫)1
(1. Key Laboratory of Traffic Safety on Track of Ministry of Education
(School of Traffic & Transportation Engineering, Central South University), Changsha 410075, China;
2. School of Transportation & Logistics, Central South University of Forestry & Technology,
Changsha 410004, China)
Abstract:For the safety protection of passengers when train crashes occur, special structures are crucially needed as a kind of indispensable energy absorbing device. With the help of the structures, crash kinetic-energy can be completely absorbed or dissipated for the aim of safety. Two composite structures (circumscribed circle structure and inscribed circle structure) were constructed. In addition, comparison and optimization of the crashworthy characteristic of the two structures were carried out based on the method of explicit finite element analysis (FEA) and Kriging surrogate model. According to the result of Kriging surrogate model, conclusions can be safely drawn that the specific energy absorption (SEA) and ratio of specific energy absorption to initial peak force(REAF) of circumscribed circle structure are lager than those of inscribed circle structure under the same design parameters. In other words, circumscribed circle structure has better performances with higher energy-absorbing ability and lower initial peak force. Besides, error analysis was adopted and the result of which indicates that the Kriging surrogate model has high nonlinear fitting precision. What is more, the SEA and REAF optimum values of the two structures have been obtained through analysis, and the crushing results have been illustrated when the two structures reach optimum SEA and REAF.
Key words:contrastive analysis; crashworthiness optimization; composite structure; Kriging surrogate model; finite element analysis
