北京航空航天大学学报 ›› 2009, Vol. 35 ›› Issue (3): 318-321.

• 论文 • 上一篇    下一篇

低密度闭孔金属泡沫压缩屈服行为的数值模拟

卢子兴, 张家雷   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100191
  • 收稿日期:2008-04-01 出版日期:2009-03-31 发布日期:2010-09-16
  • 作者简介:卢子兴(1960-),男,河北枣强人,教授,luzixing@buaa.edu.cn.
  • 基金资助:

    国家自然科学基金资助项目(10572013);北京市教育委员会共建资助项目(XK100060522)

Numerical simulation on compressive yielding behavior of closed-cell metal foam with low density

Lu Zixing, Zhang Jialei   

  1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2008-04-01 Online:2009-03-31 Published:2010-09-16

摘要: 对低密度闭孔金属泡沫的变形过程进行数值模拟是研究泡沫材料力学及失效行为的重要手段.基于Kelvin多倍胞体模型和有限元方法数值模拟了低密度闭孔泡沫铝的压缩变形的过程,给出了压缩变形曲线并确定了压缩屈服强度.在计算过程中,考虑了材料非线性和几何非线性效应以及胞体倍数对应力-应变关系的影响,并采用理想弹-塑性和线性强化弹-塑性两种材料本构关系来考察其对于泡沫铝非线性压缩力学行为的影响.结果表明,有限元计算的结果与一些文献的理论工作有较好的一致性,但是比实验值偏大.

Abstract: It is an important means to simulate the deformation process of metal foam with low density numerically for investigating their mechanical behavior and failure. Based on the geometric model of Kelvin containing multiple cells, the finite element method was used to obtain the compressive yield strengths and to simulate the deformation curves of closed-cell metal foams. The deformation processes of the Kelvin foam models were simulated at the same time. During the calculation, the material properties of nonlinearity and geometric nonlinearity were taken into account,also, the influences of the number of cells on the foam properties were discussed. In order to investigate their influences on the mechanical behaviors of foams, the two constitute relations, perfect elastic-plastic relation and linearly hardening elastic-plastic relation, were adopted. The results show that the calculated values agree well with the theoretical results ever reported by other researchers, but the values are higher than the former experimental results.

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