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This paper deals with a fatigue strength of corner joint without backing plate using experimental data and numerical method. A lack of penetration is usually found at the root of the corner joint. The fatigue strength generally depends on the lack of penetration. From comparing between experimental data of fatigue strength and numerical results, it is shown that a stress intensity factor is useful for predicting the fatigue strength of the corner joint. The stress intensity factor is calculated under condition with changing main factors of corner joint. It is suggested that the plate thickness and the length of lack of penetration are main factors of the fatigue strength of the corner joint.

Study on Fatigue Strength of Corner Joint with Lack of Penetration.