Fatigue Crack Initiation And Propagation Behaviour Of A Squeeze Cast
AI Alloy And Its Statistical Aspect
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
Keywords
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