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Welded joints submitted to variable loadings are, by their nature, experiencing a stress concentration resulting from the presence of a complex notch effect relating to geometrical and structural features of the joint. In the finite element method, modelling of the weld toe as a sharp notch reveals a non-linear relation of stresses dependent on the mesh density. In this paper, an approach for determination of the notch radius in a welded part was proposed, based on the application of finite element calculations with a non-linear elastic-plastic body model under employment of the linear hardening rule. The derived stresses are used in calculations of fatigue life, carried out according to algorithms provided for structural elements without the presence of welds.

Modelling of Stresses in Welded Joints Under Consideration of Plastic Strains in Fatigue Life Calculations *