Influence of intrinsic residual stresses on resistance of welded joint to brittle fracture

Abstract

The influence of residual welding stresses on the probability of fragile destruction of a welded joint with a crack has been investigated. The process of elastic-plastic deformation of material in the region of the crack tip was investigated under the action of stretching and the field of residual stresses. The analysis of the stress state was made by the method of final elements, taking into account the elastoplastic properties of material. To take into account the random nature of the field of residual welding stresses, the statistical modeling method (Monte—Carlo method) was used. The methodology for accounting the residual stresses is proposed when calculating welded structures for resistance to brittle fracture. Based on the results obtained, the minimum temperature was evaluated, at which the first loading of the welded structure with a crack-like defect could be carried out.