EFFECT OF SPECIMEN ASPECT RATIO ON FATIGUE LIFE OF CLOSED CELL Al-Si-Ca ALLOY FOAM  

作　　者：Amkee Kim Ilhyun Kim 

机构地区：[1]Division of Mechanical and Automotive Engineering,Kongju National University,275,Budae-dong,Cheonan,Chungnam 330-717,Korea

出　　处：《Acta Mechanica Solida Sinica》2008年第4期354-358,共5页固体力学学报（英文版）

基　　金：supported by Chungnam Automotive Technology Education Center(NURI)and BK 21.

摘　　要：Quasi-static and compressive fatigue tests on the closed cell Al-Si-Ca alloy foam specimens with three different aspect ratios were performed. It turned out that the onset of cyclic shortening of foam with a lower aspect ratio took place earlier and the fatigue strength was lower compared with the specimen with a higher aspect ratio, although all the dimensions of specimen satisfied the seven times the cell size criterion, while the quasi-static stress-strain curves were almost same having same Young＇s modulus, yield stress and plateau stress. Therefore, the seven times the cell size criterion for the quasi-static compression behavior was not applicable to the fatigue analysis of Al-Si-Ca alloy foam.Quasi-static and compressive fatigue tests on the closed cell Al-Si-Ca alloy foam specimens with three different aspect ratios were performed. It turned out that the onset of cyclic shortening of foam with a lower aspect ratio took place earlier and the fatigue strength was lower compared with the specimen with a higher aspect ratio, although all the dimensions of specimen satisfied the seven times the cell size criterion, while the quasi-static stress-strain curves were almost same having same Young＇s modulus, yield stress and plateau stress. Therefore, the seven times the cell size criterion for the quasi-static compression behavior was not applicable to the fatigue analysis of Al-Si-Ca alloy foam.

关 键 词：aluminum foam aspect ratio fatigue behavior compressive strength 

分 类 号：TB383.4[一般工业技术—材料科学与工程]