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发布时间：2019-03-12

论文类型：期刊论文

发表时间：2017-02-01

发表刊物：INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES

收录刊物：EI、SCIE

卷号：121

页面范围：58-66

ISSN号：0020-7403

关键字：Origami crash box; Energy absorption; Axial crushing; Imperfection

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.