Proposal of a Strain Concentration Model of Welded Joints for Creep-Fatigue Evaluation of Welded Structures

概要

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As the main causes of strength reduction in welded joints subjected to cyclic thermal transients, attention was given to (1)metallurgical discontinuity in which different deformation responses of base metal and weld metal can result in nonuniform stress and strain across the weldment, (2)peak strain concentration at penetration beads of unfinished welded joints, and (3)degradation of weld metal due to precipitation of dissolved metal. In order to evaluate the first two factors, an elastic follow-up model was applied. Thermal transient strength test results verified that the elastic follow-up model ensures adequate life in elevated-temperature component weldments. The proposed method was proven to be adequate in Type 304 SS, and to have safety margin in FBR grade Type 316 SS.
一般社団法人日本機械学会の論文
1997-07-15