Abstract
7000 series aluminum alloy has been mainly used as aircraft materials because 7000 series aluminum alloy has the highest intensity ratio among the aluminum alloy. Recently, 7000 series aluminum alloy foam has been developed. 7000 series aluminum alloy foam can be expected high strength than pure aluminum foam, and has attracted attention as a new shock absorber and structural members in the transport machinery and aircraft. In this study, the compressive deformation behavior of a foam material with closed cells made of 7075 aluminum alloy was examined under static, medium and dynamic loading speed conditions. A dropping weight testing apparatus and a Split Hopkinson Pressure Bar (SHPB) were used for medium and dynamic tests, respectively. The variation of the specimen density caused the difference of strength. By comparing the plateau stress at medium speed and static tests, it was found that the compressive strength is decreased with increasing strain rate. It is possibly considered that the specimen deformation behavior changed due to the different strain rates.
