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Effect of shot peening on fatigue crack repair weldment

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Document pages: 11 pages

Abstract: Fracture mechanics calculations need to verify the safety level defined in the design specification to prevent fatigue failure. Periodic inspection and evaluation cycles can lead to fatigue crack repair by eliminating cracks. In order to improve the fatigue performance of crack repair, the residual compressive stress caused by shot peening can be considered. Since stress intensity factor is a key parameter in fracture mechanics calculation, the shot peening effect estimation of stress intensity factor in fatigue crack repair weldment is studied in this paper. Fatigue tests were carried out on a group of T-butt specimens, and crack growth data were collected to calculate the stress intensity factor. The purpose of the test is to estimate the residual compressive stressess depth layer and its effect on crack propagation inhibition. Experimental estimation of the peening effect on stress intensity factors in fatigue crack repaired weldments was validated by comparison against an analytical weight function solution. Experimental stress intensity factors determined from a set of fatigue tested T-butt specimens allowed estimating preliminarily that peening has a limited effect on fatigue crack propagation inhibition for edge repaired T-butt weldments subjected to bending loading.

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