Theoretical prediction and numerical simulation of multi-cell square thin-walled structures
Theoretical prediction and numerical simulation of multi-cell square thin-walled structures
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DOI：
10.1016/j.tws.2006.09.002
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发表时间：
2006-11-01
影响因子：
6.4
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
--
作者：
Zhang, Xiong;Cheng, Gengdong;Zhang, Hui
对方形多室柱的轴向破碎进行了分析和数值研究。基于超级折叠单元理论，将型材分为角部、十字形和T形3个部分，推导出多单元截面平均压溃力的理论解。对承受动态轴向挤压的方形多单元截面进行了数值模拟，并引入了增强系数来解释铝合金 AA6060 T4 的惯性效应。解析解显示与数值结果非常吻合。结果发现，十字形部分是能量吸收最有效的部件，当该部分被分成3×3个单元时，其单单元柱的能量吸收效率可提高50%。最后，将该方法推广到方孔蜂窝体受到面外轴向挤压时的平台应力分析，在一定程度上验证了蜂窝体对孔道尺寸的机械不敏感性。 (c) 2006 Elsevier Ltd. 保留所有权利。
The axial crushing of square multi-cell columns were studied analytically and numerically. Based on the Super Folding Element theory, it theoretical solution for the mean crushing force of multi-cell sections were derived by dividing the profile into 3 parts: corner, crisscross, and T-shape. Numerical simulations of square multi-cell sections subjected to dynamic axial crushing were conducted and an enhancement coefficient wits introduced to account for the inertia effects for aluminum alloy AA6060 T4. The analytical solutions show,in excellent agreement with the numerical results. It wits found that the crisscross part was the most efficient component for energy absorption and the energy absorption efficiency of it single-cell column can be increased by 50% when the section was divided into 3 x 3 cells. Finally, the proposed method was extended to analyze the plateau stress of square cell honeycomb subjected to out-plane axial crushing and to some extent validate the mechanical insensitivity of honeycomb to cell size. (c) 2006 Elsevier Ltd. All rights reserved.