Compressive mechanical properties of foam aluminum epoxy interpenetrating phase composites
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摘要: 通过一系列准静态压缩实验研究了纯泡沫铝、 纯环氧树脂及三种不同体积分数的空心玻璃微珠(HGB)泡沫铝-环氧树脂互穿相复合材料(IPC)等五种材料压缩的变形过程和破坏形貌, 分析了其破坏机制, 并对三种IPC进行了应力松弛实验。通过绘制应力-应变曲线, 分析了其变化规律, 得出了有效弹性模量、 屈服极限等力学性能及能量吸收特性。结果表明: 三种IPC的有效弹性模量、 屈服极限及比强度、 比刚度均较纯泡沫铝有较大的提高, 泡沫铝-环氧树脂的单位体积吸能率最大, 且吸能率随空心玻璃微珠体积分数的增加而减小。泡沫铝-环氧树脂IPC有效弹性模量的预测结果与实验值较为符合。应力松弛率随空心玻璃微珠体积分数增加而增大。
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关键词:
- 互穿相复合材料(IPC) /
- 压缩实验 /
- 力学性能 /
- 能量吸收 /
- 应力松弛
Abstract: A series of quasi-static compressive experiments of pure foam aluminum, pure epoxy and foam aluminum-epoxy interpenetrating phase composites (IPC) with three kinds of volume fraction of hollow glass bead (HGB) are conducted. The stress relaxation experiments of the three IPC are performed. The deformation process and damage morphology are observed, and their failure mechanisms are analyzed. The stress-strain curves are plotted. Their change rules are discussed. The effective elastic modulus, yield limit and energy absorbing are provided. It is found that the three kinds of IPC all have better mechanical properties than pure foam aluminum. Their specific stiffness and specific strength are more than that of pure foam aluminum. The unit volume energy absorption of foam aluminum-epoxy is the maximum, and it decreases with the increase of HGB’s volume fraction. A good agreement between theoretical and experimental result is found. It is also found that the stress relaxation rate is increases with the increase of HGB’s volume fraction. -
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