A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report III) : Prediction of Residual Stresses in T- and I-joints Using Inherent Strains(Mechanics, Strength & Structural Design)

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A method of predicting the residual stress in a butt-welded plate was previously proposed by the authors. In this method, an elastic analysis is performed using inherent strain as the source of residual stress. In this paper, the method is extended for the prediction of residual stresses in welded T- and I-joints. The inherent strains in T- and I-Joints were calculated inversely fromm the residual stresses obtained by thermal elasto-plastic analysis. It is found that the inherent strain distributions in the flange side and the web side are the same for both cases of T- and I-joints provided that the widths of the flange and the web are not considerably different. The inherent strain distributions in the vicinities of two welds of an I-joint are the same one another. Also they are the same as that in a T-Joint with the same geometrical sizes. Simple formulae were developed for predicting the distribution zone and the magnitude of inherent strain under a specified welding conditions. It is shown that the residual stresses in a T-joint and an I-joint can be predicted from the inherent strain that is given by the proposed formulae. For an I-joint, the inherent strain is imposed to the two welds in the same sequence as assembling procedure by welding. The predicted residual stresses by the proposed method are compared with the results of thermal elastoplastic analysis and the agreement is shown to be excellent. The validity of the method is also confirmed by experiments.
大阪大学の論文

A Predicting Method of Welding Residual Stress Using Source of Residual Stress (Report III) : Prediction of Residual Stresses in T- and I-joints Using Inherent Strains(Mechanics, Strength & Structural Design)

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