The imperfection-sensitivity of origami crash boxes

被引:68
作者
Wang, Bo [1 ]
Zhou, Caihua [1 ]
机构
[1] Dalian Univ Technol, Dept Engn Mech, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Origami crash box; Energy absorption; Axial crushing; Imperfection; THIN-WALLED STRUCTURES; ENERGY-ABSORPTION CAPACITY; AXIAL-COMPRESSION; CIRCULAR TUBES; SQUARE TUBES; CORRUGATED TUBES; GRADED THICKNESS; ALUMINUM TUBES; DESIGN; FOAM;
D O I
10.1016/j.ijmecsci.2016.11.027
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A novel thin-walled tube, named as origami crash box, is recognized as a promising energy absorption device. Experimental results reveal that unintentional imperfection could trigger the symmetric mode with low mean crushing force rather than a high-performance mode, known as complete diamond mode. Therefore, the imperfection-sensitivity of origami crash boxes is investigated in this paper. Appropriate geometric imperfection which is regarded as a substitution of the real defect is introduced into finite element models to trigger the symmetric mode. Numerical simulation shows that the specific energy absorption SEA declines with the increase in imperfection amplitudeA(i). And a critical value of ratio A(i)/t that is just able to trigger the symmetric mode is obtained. A detailed parametric analysis indicates that a suitable geometry is beneficial to improve the compliance of origami crash box, leading to stable collapse behavior with higher performance in terms of energy absorption. Moreover, a bulkhead reinforced origami crash box is proposed as a low imperfection-sensitivity energy absorption device. And an optimal wall thickness ratio t(1)/t is obtained through numerical analysis.
引用
收藏
页码:58 / 66
页数:9
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