Siegkas P, Petrinic N, Tagarielli V L
Impact Engineering Laboratory, University of Oxford, Oxford OX5 1PF, UK.
Department of Aeronautics, Imperial College London, London SW7 2AZ, UK.
J Mech Behav Biomed Mater. 2016 Apr;57:365-75. doi: 10.1016/j.jmbbm.2016.02.024. Epub 2016 Feb 26.
Titanium foams of relative density in the range 0.35-0.50 are tested in quasi-static compression, tension and shear. The response is ductile in compression but brittle, and weaker, in shear and tension. Virtual foam microstructures are generated by an algorithm based on Voronoi tessellation of three-dimensional space, capable of reproducing the measured size distribution of the pores in the foam. Finite Element (FE) simulations are conducted to explore the mechanical response of the material, by analysing the elasto-plastic response of a statistical volume element (SVE). The simulations correctly predict the ductile compressive response and its dependence on relative density.
对相对密度在0.35至0.50范围内的泡沫钛进行了准静态压缩、拉伸和剪切测试。其在压缩时的响应是延性的，但在剪切和拉伸时是脆性的且较弱。虚拟泡沫微观结构由一种基于三维空间Voronoi镶嵌的算法生成，该算法能够再现泡沫中孔隙的实测尺寸分布。通过分析统计体积单元（SVE）的弹塑性响应，进行了有限元（FE）模拟以探究材料的力学响应。模拟结果正确地预测了延性压缩响应及其对相对密度的依赖性。
