Abstract
Rotating bending fatigue tests and tension-compression fatigue tests were carried out to investigate effect of mean stress on fatigue strength at N=10^7 on specimens with a small artificial hole of non-combustible magnesium alloy, AMX602B(X=Ca). It was clarified that the fatigue strength at N=10^7 under tensile mean stress could be estimated using the modified Goodman diagram. However, the fatigue strength at N=10^7 under compression mean stress could not be estimated using the modified Goodman diagram. Non-propagation crack was not observed among the non-broken specimens at N=10^7 by rotating fatigue tests. The Fatigue strength at N=10^7 of the specimen with the small artificial hole is not threshold stress for crack propagation but critical stress for crack initiation. Hence it is probable that the effect of mean stress on fatigue strength at N=10^7 is small and the fatigue strength at N=10^7 under compression stress cannot be estimated using modified Goodman diagram.
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