単層および多層すみ肉溶接残留応力の測定

固有ひずみの関数表示による残留応力の推定法と測定法(第五報)

抄録

In this paper, a new method for the measurement of 3-dimensional residual stresses in fillet welds is developed using inherent strain, which is considered a source of residual stresses. As a procedure of the new method, firstly the inherent strains are determined from a few of measured elastic strains with the aid of a proposed inherent strain distribution function, then residual stresses are computed by performing elastic analysis when inherent strains are applied to the weld joints.
In the actual measurement, when three kinds of specimens T, L_y and L_z are cut from a fillet weld, the measuring method is called TL_yL_z-method ; when only one piece of specimen T is cut from the weld, the measuring method is called T-method.
Respectively using TL_yL_z-method and T-method, 3-dimenional residual stresses distributed on the transverse sections of a single-pass and a multipass T-type fillet welds are measured. The residual stresses measured by TL_yL_z-method and T-method show a good coincidence with the ones directly measured on the surfaces of the welded joints.