Analysis of near weld stress field based on strain measurement and physical mesomechanics


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Stresses induced by welding are analyzed from the viewpoint of material deformation behavior. Strain gages are used to measure the residual stresses, and electronic speckle-pattern interferometry is used to analyze the response of the welded work to external force. A tensile load is applied to a butt-welded, thin-plate steel specimen, and the resultant strain field is analyzed with the electronic speckle-pattern interferometry. Comparison is made with the case of a nonwelded specimen of the same material and dimension. The analysis indicates that the residual stress due to welding makes the normal strain due to the external tensile load asymmetric. The asymmetry enhances shear and rotational modes of deformation, generating stress concentration at a point away from the weld where the residual stress is substantially negligible. The observed features are discussed based on physical mesomechanics. Analysis reveals plastic deformation like behavior in the response of the welded specimen to the external force.

Sobre autores

S. Yoshida

Southeastern Louisiana University

Autor responsável pela correspondência
Email: syoshida@selu.edu
Estados Unidos da América, Hammond, 70402

T. Sasaki

Niigata University

Email: syoshida@selu.edu
Japão, Niigata, 950-2181

M. Usui

Niigata University

Email: syoshida@selu.edu
Japão, Niigata, 950-2181

Ik-K. Park

Seoul National University of Science and Technology

Email: syoshida@selu.edu
República da Coreia, Seoul, 139-743

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