Elastic field prediction for a welding repaired material using a semi-analytical method

Material mismatch between the welding bead and its surrounding matrix has been known to cause stress concentration due to incompatible deformation, and/or even crack regener-ation, thus greatly affecting the performance of a welding repaired material. In this paper, a semi-analytical method (SAM) is developed to tackle problems for material mismatch in a welding repaired material with free surface under remote tensile loading. The hetero-geneous welding bead is modeled by a homogeneous base material containing unknown eigenstrains through the equivalent inclusion method; after which a numerical discretiza-tion is adopted and the eigenstrains within each computational element are determined by iteratively solving a set of linear equations with the assistance of conjugate gradient method. Stress field arising from the eigenstrains can be obtained by employing previously derived influence coefficients. The SAM is then examined by a simple finite element model and utilized to analyze influences of material properties, aspect ratio, angle of differently shaped welding bead and interactions among multiple welding beads on the stress dis-tribution. The SAM may have potential applications in dealing with problems related to residual stress in welded material due to eigenstrains. (c) 2021 Elsevier Inc. All rights reserved.

Automated summary

In this paper, a semi-analytical method (SAM) is developed to address material mismatch in a welding repaired material, modeling the heterogeneous welding bead and determining stress field by iteratively calculating eigenstrains. The SAM can analyze the influences of material properties, aspect ratio, angle of differently shaped welding bead, and interactions among multiple welding beads on stress distribution.