The dynamic compressive behaviors of an open-cell aluminum foam
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摘要: 在SHPB装置上对渗流法制备的通孔泡沫铝进行了动态压缩实验，研究了相对密度为0.341~0.419的通孔泡沫铝在10-3~2000 s-1应变率范围内的压缩响应特征和应变率相关性，并用扫描电镜（scanning electron microscope,SEM)分析了泡沫铝的压缩变形特征。实验结果表明，通孔泡沫铝有明显应变率效应，随应变率上升，泡沫铝流动应力提高。SEM观察结果揭示，在动态压缩下，通孔泡沫铝宏观上均匀变形，微观变形机制以泡孔横向伸展坍塌为主。Abstract: The dynamic compressive experiments were conducted on the open-cell aluminum foams prepared by infiltration process using the SHPB. The dynamic response and strain rate dependence of the aluminum foams with the relative density of 0.341~0.419 were investigated in the strain rate range from 10-3 to 2000 s-1, and the deforming characteristic of the foams was observed by using the scanning electron microscope(SEM). Experimental results show that the flow stresses of the aluminum foams increase with increasing strain rate, demonstrating a distinct strain rate effect in the open-cell aluminum foams. Observed results with SEM reveal a homogeneously macroscopic deforming mode in the dynamic compression of the open-cell aluminum foam. However, the microscopic deformation of the foams is adopted by the transversal stretch of the cells.
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Key words:
- solid mechanics /
- strain rate effect /
- dynamic compression /
- open cell aluminum foam
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