Surface vs. interior failure behaviors in a structural steel under gigacycle fatigue: Failure analysis and life prediction |
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Affiliation: | 1. School of Reliability and Systems Engineering, Beihang University, Weimin Building, No. 37, Xueyuan Road, Haidian District, Beijing 100191, PR China;2. Science and Technology on Reliability and Environmental Engineering Laboratory, Beihang University, Beijing 100191, PR China |
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Abstract: | The failure behaviors of a structural Cr–Ni–W steel under gigacycle fatigue were investigated, and a life prediction method based on the crack growth was proposed. The discovery of two failure phenomena, including the coexistence of surface and interior cracks and the coexistence of multiple fish-eyes, verifies the possibility of competing failure. The developed interior crack growth model reveals the failure progress at a slow rate below 10?10 m/cycle within the fish-eye induced by the inclusion or the inhomogeneous matrix area. The validity of the life prediction method is proved by the good agreement between the predicted and the experimental lives. |
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Keywords: | Gigacycle fatigue Competing failure Multiple fish-eyes Inhomogeneous matrix area Life prediction |
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