Author(s)

M. Goto, T, Yamamoto, H. Nisitani & N. Kawagoishi

Abstract

Fatigue crack initiation and propagation behaviour of a squeeze cast A1 alloy and its statistical aspect M. ~ o t o ' , T. ~amamoto', H. ~ i s i t a n i ~ & N. ~ a w a ~ o i s h i ~ ' ~ e ~ t . of Mechanical Engineering, Oita University, Japan 2~yushu-~angyo University, Japan 3 Kagos hima University, Japan Abstract In order to clarify the crack initiation and propagation behaviour of a squeeze cast aluminum-silicon-magnesium alloy, fatigue tests of smooth specimens cut from A1 alloy car wheels formed by the squeeze casting were carried out under the constant stress amplitudes. The behaviour of a major crack was monitored successively by the plastic replication method. In addition to this, the analysis of the initiation and propagation behaviour of multiple cracks were made to investigate the statistical characteristics of microcracks. Namely, the distribution of crack initiation life, propagation life, crack growth rate and crack length were studied by assuming Weibull distribution. Through th

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