闭孔胞状泡沫铝的单向压缩力学性能和吸能能力

Mechanical properties and energy absorption capability of closed-cell Al foam under uniaxial compression

通过不同孔隙度闭孔胞状泡沫铝的准静态压缩试验,研究泡沫铝孔隙度对其力学性能和吸能能力的影响。闭孔胞状泡沫铝单轴压缩应力应变曲线呈现明显的3个阶段:线性变形、平台阶段、致密化阶段;在单向压缩情况下,泡沫铝的压缩强度、吸能能力随着孔隙度的增大而减小;采用Gibson-Ashby的模型分析闭孔胞状泡沫铝的压缩屈服强度,并提出泡沫铝吸能能力公式,为工程应用提供理论支持。

Based on the uniaxial compressive test of different porosity closed-cell Al foam, the effect of porosity on mechanical properties and energy absorption capacity were investigated. Compressive stress-strain curve of closed-cell AI foam consists of three distinct regions, which is the linear region, the collapse region and the densification region. The compressive strength and energy absorption capacity of closed-cell Al foam decrease with the increase of porosity. Analyzing the compressive yield stress by Gibson-Ashby model, formula on energy absorption capability of Al foam was presented, which could provide support for its engineering application.