A STUDY OF RESIDUAL STRESS FORMATION AFTER ELASTOPLASTIC DEFORMATION OF PIPE WALLS, MADE FROM DISPERSE-HARDENED ALUMINUM ALLOY, AS A RESULT OF EXTERNAL PRESSURE

Abstract

The formation of residual stresses after elastic-plastic deformation of pipe walls as a result of external pressure is studied using the approach based on a combination of methods of the physical theory of plasticity and mechanics of a deformable solid. As a result of the research, it is found that at the same value of the applied pressure, the thickness of the area subjected to plastic deformation is less for the alloys reinforced with large particles than for those reinforced with small particles. The values of the circumferential and axial residual stresses exceed the value of the radial residual stresses by more than an order of magnitude. Therefore, in the first approximation, the radial residual stresses can be neglected.