闭孔泡沫铝准静态压缩试验及吸能特性研究

Study on quasi-static compression test and energy absorption characteristics of closed-cell aluminum foam

为研究闭孔泡沫铝厚度及密度变化对其静态力学性能和吸能特性影响,采用液压式WE-1000万能试验机对其进行静态压缩试验。结果表明:泡沫铝厚度由50 mm增加到100 mm,致密化应变和能量吸收分别增长10%~28%、30%~50%,而弹性模量和平台应力基本保持不变;闭孔泡沫铝的密度从0.35 g/cm^(3)增加到0.65 g/cm^(3),其弹性模量增加了32%~132%、能量吸收量增长44%~95%、屈服平台应力提高了35%~130%,致密化应变降低了6%~16%;相比于低密度闭孔泡沫铝,高密度闭孔泡沫铝吸能较多,但吸能效率偏低。

In order to study the effect of thickness and density change of closed cell aluminum foam on its static mechanical properties and energy absorption characteristics,static compression test was carried out by hydraulic WE-1000 universal testing machine.The results show that the thickness of foamed aluminum increases from 50 mm to 100 mm,and the densification strain and energy absorption increase by 10%~28%and 30%~50%respectively,while the elastic modulus and platform stress remain basically unchanged.The density of closed cell aluminum foam increased from 0.35 g/cm^(3) to 0.65 g/cm^(3),the elastic modulus increased by 32%~132%,the energy absorption increased by 44%~95%,the yield platform stress increased by 35%~130%,and the densification strain decreased by 6%~16%.Compared with low-density closed cell aluminum foam,high density closed cell aluminum foam has more energy absorption but lower energy absorption efficiency.