Effects of Biaxial Stress Condition for Fatigue Properties of Magnesium Alloy

Abstract:

Fatigue crack propagation tests of magnesium alloy were conducted under conditions of biaxial and uniaxial loading by using a cruciform specimen with the biaxial fatigue tester. The purpose of this study is to investigate the effect of biaxial stress on the fatigue crack growth properties ⊿KⅠ-da/dN. From these comprehensive experiments, the remarkable effect was found in the specific biaxiality ratio σx 0/σy 0 on the ⊿KⅠ-da/dN relationship. When biaxiality ratio was 0.5, it turned out that the fatigue crack propagation velocity of a magnesium alloy becomes very slow. In other biaxiality ratios, fatigue crack propagation velocity was influenced in some extent. Fatigue crack propagation velocity decreases a little as the stress which acts in parallel with a crack increases.

• Periodical: Materials Science Forum (Volumes 488-489)
• Pages: 859-864
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.488-489.859
• Online since: July 2005
• Authors: Yasumi Ito, Akira Shimamoto
• Keywords: AZ31B, Biaxial Fatigue Tester, Biaxial Stress, Crack Propagation, Fatigue, Stress Intensity Factor Range (ΔK)

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