先在き裂を有する突合せ継手の残留応力・残留ひずみにおよぼす溶接諸条件の影響

概要

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In the welded joint having a pre-existing defect, the crack tip is subjected to thermal stress/strain cycles by successive welding. Hot straining embrittlement and residual stress due to successive welding influence the brittle fracture initiation of weldment. Thermo-elasto-plastic analyses by two-dimensional finite element method are carried out for obtaing thermal stresscut/straincut cycles during welding and distributions of residual stresses/strains near the tip of a pre-existing crack. The results obtained in this report are summarized as follows : (1) Residual stress/strain distributions near the tip of a pre-existing crack are cheifly determined by parameters. (a) Maximum temperature at the crack tip T_<αM>=0.242α_0 cut Q/cρhε_<Y_0> (b) Initial temperature θ_i=αθ_i/ε_<Y_0> (c) Temperature above which yield strength becomes zero θ_M=α_0θ_M/ε_<Y_0> (2) Conventinal formulae are presented for the calculation of residual stress/strain distributions near the crack tip produced in single-Vee-groove weld.
社団法人溶接学会の論文
1977-08-05