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中文摘要：
基于剖球模型,利用LS-DYNA有限元软件,研究了开孔泡沫金属在冲击载荷作用下的动态力学行为。重点分析了冲击速度、相对密度对泡沫金属的变形模式以及平台应力的影响。结果表明：泡沫金属材料的整体变形模式本质上是微观棱壁的不同变形模式在宏观尺度上的体现,与相对密度和冲击速度有着密切的联系。在不同冲击速度下,材料会出现逐层压溃、混合变形、均匀压缩3种变形模式。材料在逐层压溃和混合变形模式的中后期,会出现局部失稳带,削弱材料的承载能力,导致整体应力水平显著下降。随着材料相对密度的增加,不同变形模式之间的转变速度也随之增大。此外,相对密度、变形模式和惯性效应均会影响到平台应力的改变,从而呈现出相对复杂的变化趋势。
英文摘要：
The dynamic crushing behaviors of the open-cell foams based on sphere-subtracted models were simulated by the LS-DYNA finite element software.Particularly,the influences of impacting velocity and relative density on deformation modes and plateau stress of the metallic foams were investigated.The simulation results indicate that the whole deformation modes of the metallic foams essentially reflect the different deformation modes of micro struts and have close relationship with the relative density and impact velocity.Under different impact velocities,the metallic foams present three different types of deformation modes,i.e.,shock,transition and homogeneous deformation mode.With further deformation,a narrow localized instability band develops gradually in the mid-to-late shock and transition deformation mode.It weakens the bearing capacity of the metallic foams corresponding to apparent drop of the entire stress and plateau stress curves.The critical velocities,at which deformation modes switch from one mode to another,increase with relative density increasing.In addition,relative density,deformation mode and the inertia effect would affect the change of the plateau stress and thus the changing trend of the plateau stress is complex.
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