采用MTS和SHPB开展了准静态和动态压缩实验，研究了不同密度的闭孔泡沫铝在不同温度和应变率下的力学性能。实验结果表明，在准静态和动态条件下泡沫铝的压溃强度均随相对密度的增加而增大，且与相对密度变化呈幂指数关系；闭孔泡沫铝具有很强的温度软化效应，其压溃强度随温度的升高而降低，且与温度变化成线性关系；泡沫铝也具有明显的应变率敏感性，其压溃强度随应变率的升高而增大。本文最终拟合得到了闭孔泡沫铝压溃强度关于相对密度、温度以及应变率的经验型公式。
Abstract
SHPB and MTS machine were employed to conduct quasi-static and dynamic compression tests to study mechanical performance of closed-cell aluminum foam with different densities under different temperatures and strain rates.The test results showed that the crushing strength of aluminum foam increases with increase in its relative density under quasi-static and dynamic conditions, the crushing strength has a power exponential relationship with the change of relative density; closed-cell aluminum foam has a very strong temperature softening effect, its crushing strength drops with increase in temperature and has a linear relationship with variation of temperature; aluminum foam has an obvious sensitivity to strain rate, its crushing strength increases with increase in strain rate.Finally, an empirical formula for crushing strength of closed-cell aluminum foam related to relative density, temperature and strain rate was obtained through fitting.
关键词
闭孔泡沫铝 /
力学性能 /
温度 /
应变率 /
压溃强度
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Key words
closed-cell aluminum foam /
mechanical performance /
temperature /
strain rate /
crushing strength
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