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

Abstract:

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.

• Periodical: Key Engineering Materials (Volumes 353-358)
• Pages: 170-173
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.353-358.170
• Online since: September 2007
• Authors: K. Morishige, Hiroshi Noguchi
• Keywords: Fatigue, Mean Stress, Modified Goodman Diagram, Noncombustible Magnesium Alloy

References

[1] Y. Kitahara, K. Ikeda, H. Shimazaki, H. Noguchi, M. Sakamoto, H, Ueno : Transactions of the japan society of mechanical engineers(in Japanese), Series A, Vol. 72, No. 717 (2006) p.661.

[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.