STRESS-STRAIN STATE OF WELDED AND BRAZED ASSEMBLIES OF DISSIMILAR MATERIALS WITH SOFT INTERLAYER AT TEMPERATURE-FORCE LOADING

摘要

There was researched a stress-strain state (SSS) at temperature-force loading of cylinder assemblies of materials of similar strength, but different by temperature coefficients of linear expansion (TCLE), with soft (lower yield limit than in base metal) interlayer and average temperature coefficient of linear expansion. Fields and distribution diagrams of stresses and plastic deformations of assemblies were analyzed. Investigation of SSS showed that effect of mutual temperature (cooling) and force (compression) loading of assemblies with soft interlayers appears in increase of radial and circumferential stresses in both materials, increase of equivalent ones in the material with high TCLE and the interlayer and axial ones in the joined materials, and, respectively, decrease of equivalent in the material with lower TCLE. Tangential stresses at that remain virtually the same as at purely temperature loading. In change of cooling by heating the materials change their places. The value of maximum plastic deformations in the interlayer material at interface with base material close to external surface at mutual temperature-force loading reaches 2.3%. At that, axial tension stresses in brittle materials with low TCLE (ceramics, graphite, etc.) during cooling in the assemblies with soft interlayer reduce by value of compression external stresses, i.e. risk of brittle fracture reduces.