Cell Wall Buckling Mediated Energy Absorption in Lotus-type Porous Copper
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第10期
论文作者：Weidong Li Haoling Jia Chao Pu Xinhua Liu Jianxin Xie
文章页码：1018 - 1026
摘 要：The energy absorption characteristics of the lotus-type porous coppers at the strain rate of 10–3s–1to2400 s–1were systematically investigated. Depending on the relative density and loading rate, the energy absorption capability of the tested samples varied from 20 to 85 MJ m–3, while the energy absorption efficiency fluctuated around 0.6. An energy absorption efficiency curve based approach was proposed for unambiguous identification of the plateau regime, which gave an extension of 0.50 strain range for the presently investigated porous coppers. With detailed observations of cell wall morphologies at various deformation stages, it was suggested that buckling of cell walls was the dominant mechanism mediating the energy absorption in lotus-type porous coppers.
Weidong Li1,2，Haoling Jia1，Chao Pu1，Xinhua Liu2，Jianxin Xie2
1. Department of Materials Science and Engineering,The University of Tennessee2. Key Laboratory of Advanced Materials Processing,University of Science and Technology Beijing
摘 要：The energy absorption characteristics of the lotus-type porous coppers at the strain rate of 10–3s–1to2400 s–1were systematically investigated. Depending on the relative density and loading rate, the energy absorption capability of the tested samples varied from 20 to 85 MJ m–3, while the energy absorption efficiency fluctuated around 0.6. An energy absorption efficiency curve based approach was proposed for unambiguous identification of the plateau regime, which gave an extension of 0.50 strain range for the presently investigated porous coppers. With detailed observations of cell wall morphologies at various deformation stages, it was suggested that buckling of cell walls was the dominant mechanism mediating the energy absorption in lotus-type porous coppers.
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