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FEM analysis of plasticity-induced error on measurement of welding residual stress by the contour method

  • Shang Hyon Shin
Article

Abstract

The contour method relies on deformations that occur when a residually stressed component is cut along a plane. The method is based on the elastic superposition principle. When plasticity is involved in the relaxation process, stress error in the resulting measurement of residual stress would be caused. During the cutting the specimen is constrained at a location along the cut so that deformations are restrained as much as possible during cutting. With proper selection of the constraining location the plasticity effect can also be minimized. Typical patterns of longitudinal welding residual stress state were taken to assess the plasticity effect along with constraining locations.

Key Words

Residual Stress Contour Method Plasticity Effect Stress Error 

Nomenclature

E

Young’s Modulus

v

Poisson’s ratio

Sy

yield strength

δx

Weld-direction component of residual stress

δ0

Peak residual stress

ξ

Normalized y-coordinate

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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2005

Authors and Affiliations

  1. 1.Department of Marine Engineering SystemMokpo Maritime UniversityMokpo-siKorea

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