Simple Measuring Methods of 3 Dimensional Residual Stresses in Bead-on-plate Welds

Estimating and Measuring Methods of Residual stresses Using Inherent strain Distribution Described as Functions (Report 3)

Abstract

In this paper, very simple measuring methods of 3-dimensional residual stresses are proposed with the aid of distribution functions of inherent strains. In the simple measuring methods, inherent strain zones are predicted by newly proposed formulas based on the results of thermal elastic plastic FEM analysis, and a few of coefficients involved in distribution functions of inherent strains are estimated using measured elastic strains at some points. In the actual measurements, when a specimen T perpendicular to weld line is sliced from a welded plate, the method is called as simple T method. When measurements are done only on the surface of a welded plate, the method is called as simple surface method.
With comparing residual stresses obtained both by thermal elastic plastic FEM analysis and by simple T method and simple surface method, the validity of proposed simple measuring methods is demonstrated.