Effect of Mean Stress on Fatigue Strength of Non-Combustible Magnesium Alloy

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Effect of mean stress on fatigue strength at N=107 of non-combustible magnesium alloy AMX602B(X=Ca) was investigated. Rotating bending fatigue test and tension-compression fatigue test were carried out on specimens with a small hole or crack. It was clarified that the fatigue strength at N=107 of the specimen with the small hole was about 30-150% higher than that of the specimen with the small crack within the range of σm=0~100MPa. This is the reason why the fatigue strength at N=107 of the specimen with the small hole can be not threshold condition for crack propagation but crack initiation. The fatigue strength at N=107 of the specimens with the small hole decreased within the range of σm=100~195MPa due to a static small crack initiating from the small hole at first loading. The effect of mean stress on fatigue strength at N=107 both oh the specimens with the small hole and crack could be estimated using modified Goodman diagram.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

170-173

Citation:

K. Morishige and H. Noguchi, "Effect of Mean Stress on Fatigue Strength of Non-Combustible Magnesium Alloy", Key Engineering Materials, Vols. 353-358, pp. 170-173, 2007

Online since:

September 2007

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$38.00

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[2] P. G. Forrest : Fatigue of Metals. (Oxford : Pergamon, 1970).

[3] C. C. Osgood : Fatigue Design. (New York : Woley-Interscience, 1970).

[4] H. Nishitani, K. Okasaka : Bulletin of the Japan society of mechanical engineers, Vol. 16, No. 99 (1973) p.1229.

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