闭孔泡沫镁材料静动态压缩力学性能与吸能特性

Mechanical Properties and Energy Absorption Characteristic of Magnesium Foam under Static and Dynamic Compression

实验研究了闭孔泡沫镁材料静动态压缩过程的力学性能和吸能特性。得到了材料在准静态压缩下的微观变形特点,不同应变率条件下的压缩应力应变关系曲线及其特征。用单位体积的吸能W来表征材料的吸能特性,分析了在静动态条件下孔径和相对密度对泡沫镁材料的应力应变关系和单位体积吸能的影响规律。结果表明:孔径对闭孔泡沫镁力学性能和吸能特性影响显著,存在一个适中的孔径范围,此时泡沫镁的性能最优;随着相对密度增加,屈服强度和单位体积吸能W显著增加。研究结果可为多孔材料动态破坏研究和材料及工程设计提供理论依据和参考。

Mechanical properties and energy absorption characteristic of the magnesium foam under static and dynamic compression were studied by an experiment.The microdeformation features under quasi-static compression condition and the stress-strain curves under the different strain rates were obtained.The influence laws of relative density,cell size and strain rate on mechanical properties such as stress-strain model,yield strength,flow stress and energy absorption per unit volume W were discussed by the characterized energy absorption characteristic with energy absorption per unit volume of W.The investigated results show that the cell size has obvious effects on the mechanical properties and energy absorption characteristic of the magnesium foam,in which a moderate cell size range exists;yield strength and energy absorption per unit volume of W increase with the increase of relative density of the magnesium foam.The investigated results can provide theoretical basis and reference for investigating dynamic destroy of the multi-hole material and its engineering design.