굴곡측정법을 이용한 극후판 용접부 잔류응력분포 정량분석

Abstract

Abstract Residual stresses arising from the materials processing such as welding and joining affect significantly the structural integrity depending on the external loading condition. The quantitative measurement of the residual stresses is of great importance in order to characterize the effects of the residual stresses on the structural safety. In this paper, we introduce a newly devised destructive technique, the contour method (CM), which is applied for the measurements of the residual stress distributions through the thickness of a 80 mm thick steel weld. Residual stresses are evaluated from the contour, which is the normal displacementon a cut surface produced by the relaxation of residual stresses, using a finite element model. The CM provides a two-dimensional map of the residual stresses normal to the cut surface. The CM developed in the present study was validated in comparison with the residual stress distribution determined by a well- established neutron-diffraction residual stress instrument (RSI) instrumented in HANARO neutron research reactor. Key Words : Welding, Residual stress, Contour method, Neutron diffractionISSN 1225-6153Online ISSN 2287-8955