Study on Fracture Micro-mechanics Mechanism and Dynamic Energy Absorption Property of Closed-cell Foam Metals
To gain a better understanding of energy absorption property and failure mechanism of closed-cell foam metals, the dynamic energy absorption property of closed-cell foam metals with Al matrix, Al-Si6 matrix and Al-Si12 matrix CCAF, also Mg matrix, aluminum-fiber and RE-Al alloys are discussed by the compression and energy absorption test. And then the fracture micro-mechanics mechanism and dynamic energy absorption of closed-cell foam metals are studied by scanning electron microscope(SEM). Results obtained in this research included: (1) the stress strain curves of different foam metals indicate that Al matrix CCAF is better for energy absorption materials, because of the best energy absorption property and the high strength. (2) the strength of foam metals with Al-Si6 matrix, Al-Si12 matrix and Mg matrix are higher than Al matrix CCAF, and also have better energy absorption property. But the failure indicates obvious characteristic of brittle fracture. (3) the micro-topography of CCAF with Al matrix is simple and uniform. And the fracture has obvious tear trace. Aluminum-fiber and RE-Al alloys have better compression property, but lower strength and no strength increasing stage lead to destroy suddenly. (4) The curves of energy absorption for Al matrix and Al-Si6 matrix CCAF are on the rise. Also, the maximum of energy absorption is about 2.1MJ/m 3. (5) micropore and crack of closed-cell foam metals provide a good space for the compression and energy absorption. On the other hand, it is the main failure parts of damage.
LV Xiang-feng PAN Yi-shan LI Zhong-hua
School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）