泡沫金属的尺寸效应和约束条件下的压缩性能

通过准静态单轴压缩和径向约束轴向压缩实验,研究了闭孔泡沫铝的尺寸效应,分析了试件尺寸(直径和高度)和密度对泡沫材料力学性能的影响。结果表明：单轴压缩时闭孔泡沫铝力学性能具有较为明显的尺寸效应,而径向约束轴向压缩时闭孔泡沫铝的尺寸效应不明显。两种加载情况下,密度都对闭孔泡沫铝的力学性能有着明显的影响。与单轴压缩相比,径向约束轴向压缩时闭孔泡沫铝的屈服应力和平台应力随密度的变化更为显著。

Size effects and compression properties of metallic foams with lateral constraint

Quasi-static uniaxial compression on closed-cell aluminum foam and compression on closed-cell aluminum foam with lateral constraint were performed to study the size effects. The effects of sizes (height and diameter) and density of foam specimen on the mechanical properties of aluminum foam were investigated. The results showed that, the mechanical properties of closed-cell aluminum foams under uniaxial compression have obvious size effects, while the size effects in closed -cell aluminum foams with lateral constraint is not so obvious. Foam density is critical to the mechanical properties of closed-cell aluminum foams under the two different loading conditions. The dependency of yield strength and plateau stress of aluminum foam with lateral constraint on foam density is found to be more significant.