A Numerical and Experimental Study on Fatigue Crack Growth of Ti-6Al-4V Specimens in Presence of Tensile Residual Stresses

Document Type : Research Article

Authors

Department of Mechanical Engineering, Amirkabir University of Technology

Abstract

Fatigue crack growth is one of the failure mechanisms in engineering structures, which is intensified by the presence of tensile residual stress. In this research, the effect of tensile residual stress in front of the crack front on fatigue crack growth has been investigated. The mechanical residual stress has been applied to the samples using the four-point bending method, and the residual stress has also been measured using the hole drilling method. Fatigue crack growth tests were performed on single edge notch bend samples with residual stress and without residual stress and the repeatability of the test was checked. To investigate the plastic area ahead of the crack tip, the applied residual stress, and obtain the fracture mechanics parameters, Abaqus commercial software has been used. The results of this study show the increase in the rate of fatigue crack growth in the presence of tensile residual stress. This increase in fatigue crack growth rate can reduce fatigue life up to 50%.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 55, Issue 4
July 2023
Pages 543-554

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