分别采用头部为平面、球面和圆锥面的三种圆柱体压头,对泡沫纯铝和泡沫铝-硅合金进行了准静态压坑试验,研究不同性质的基体泡沫铝的压坑变形力学行为,探讨压坑变形的微观机制.结果表明:不同形状压头的压坑载荷-位移响应特征均与单轴压缩的响应相比均有较大差别,其显著特征是随着变形量的增大应力上升的速度较快,泡沫铝的压坑载荷-位移曲线的形状还与所用压头的形状密切相关;随着泡沫铝基体性质的不同,其压坑变形宏观形态和微观机制也存在较大的差异.
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