Issue
J. Phys. IV France
Volume 10, Number PR9, September 2000
EURODYMAT 2000 - 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) Pr9-329 - Pr9-334
DOI https://doi.org/10.1051/jp4:2000955
EURODYMAT 2000 - 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 10 (2000) Pr9-329-Pr9-334

DOI: 10.1051/jp4:2000955

Dynamic properties and asymmetry of tension and compression of metal matrix composites under impact loading

H. Chenguang1, Z. Rongjing1, D. Zhuping1 and R.K.Y. Li2

1  LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, P.R. China
2  Department of Applied Physics and Material Sciences, City University of Hong Kong, Hong Kong, China


Abstract
The mechanical behaviors of 2124, Al-5Cu, A1-Li and 6061 alloys reinforced by silicon carbide particulates, together with 15%SiCw/6061 alloy, were studied under the quasi-static and impact loading conditions, using the split Hopkinson tension / compression bars and Instron universal testing machine. The effect of strain rate on the ultra tensile strength (UTS), the hardening modulus and the failure strain was investigated. At the same time, the SEM observations of dynamic fracture surfaces of various MMC materials showed some distinguished microstructures and patterns. Some new characteristics of asymmetry of mechanical behaviors of MMCs under tension and compression loading were also presented and explained in details, and they could be considered as marks to indicate, to some degree, the mechanism of controlling damage and failure of MMCs under impact loading. The development of new constitutive laws about MMCs under impact loading should benefit from these experimental results and theoretical analysis.



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