A two-scale generalized FEM for the evaluation of stress intensity factors at spot welds subjected to thermomechanical loads

H. Li, P. O'Hara, C. A. Duarte

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a two-scale Generalized Finite Element Method with global-local enrichments (GFEM gl ) for the evaluation of stress intensity factors (SIFs) at spot welds subjected to thermomechanical loads. The method uses the solution of local boundary value problems as enrichment functions for the global/structural model and can provide accurate solutions on coarse meshes adopted at the structural scale. The faying surface and spot welds are represented by special enrichment functions instead of meshes fitting the weld geometry. This greatly simplifies the model generation process in comparison with a Direct Finite Element Analysis DFEA. Numerical experiments show that the proposed GFEM gl is able to capture the strong gradients and singularities near the spot weld edge. It can provide accurate solutions and SIFs comparable to a 3-D DFEA while requiring significantly less computational resources and user time. The robustness of the method is demonstrated through examples involving spot welds with irregular shapes and built-up panels subjected to sharp thermal fluxes.

Original languageEnglish (US)
Pages (from-to)21-52
Number of pages32
JournalEngineering Fracture Mechanics
Volume213
DOIs
StatePublished - May 15 2019

Keywords

  • Extended FEM
  • Generalized FEM
  • Multiscale
  • Spot welds
  • Stress intensity factor
  • Thermomechanical effects

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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