Relations are proposed for evaluating the stress-strain state and strength of a butt weld with a mild interlayer under elastoplastic tension in plane-and axisymmetric-strain conditions. The relations allow for the distribution of transverse normal stresses across the interlayer thickness and the interaction and hardening of the metals in the elastoplastic domain. The predicted strain distribution in certain areas of the weld and its strength are verified experimentally Keywords: butt-welded joint, mild interlayer, stress-strain and strength analysis, plane and axisymmetric strains, metal hardening, elastoplastic domainMost welds are mechanically heterogeneous, i.e., they include areas of higher or lower strength compared with that of the base metal. These areas are called hard and mild interlayers, respectively. In some cases, mechanical heterogeneity is produced by welding; in other cases, it appears during operation, especially at high temperatures.Mechanically heterogeneous welds subject to elastoplastic tension are studied intensively, both theoretically and experimentally (see, for example, [2][3][4][5]9]). It was shown in these studies that the mild interlayer strongly affects the strength of the welded joint. In [2,3,5], the stress state of a weld with a mild interlayer was determined disregarding the hardening of the material in the elastoplastic domain (E M As the thickness ratio of the interlayer increases, the stress σ x M decreases, becoming zero after ae > 2. This assumption is
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