変動荷重下の凝固割れに対する力学的指標と割れ発生評価式の提案 : 供用下にある構造物の溶接施工に関する研究(第一報)(平成2年度春季全国大会論文発表講演論文)

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Steel structures in service condition, such as bridges, offshore-structures and steel towers, are subject to pulsating loads caused by vehicles, waves, current, wind, etc."Welding under pulsating loads" cannot be avoided in the cases of repair, reinforcement and reconstruction works. In this study, weld cracking test under pulsating loads was carried out and solidification crack was considered from mechanical standpoint. The main results are as follows ;(1) In weld cracking test under pulsating loads, solidification cracks occured in no solidification crack zone evaluated by Trans-Varestraint cracking test.(2) The accumulation of total strain, ε_t, at weld metal in solidification crack temperature zone was proposed as a mechanical measure for solidification crack. Solidification cracks under pulsating loads occur when ε_t exceeds the critical strain, ε_<cr>, for crack initiation dependent on material characteristics.(3) As an engineering and mechanical measure, the relative root gap opening displacement. Δδ, which is easily measured before welding was adopted. The relation between ε_t, and Δδ was considered. Moreover, the practical evaluating method for prevention of solidification crack under pulsating loads using Δδ was proposed.(4) The practical use and useful evaluating equation for prevention of solidification crack under pulsating loads of constant value was derived. Moreover, validity of the equation was concretly shown.
社団法人溶接学会の論文
1990-02-05

変動荷重下の凝固割れに対する力学的指標と割れ発生評価式の提案 : 供用下にある構造物の溶接施工に関する研究(第一報)(平成2年度春季全国大会論文発表講演論文)

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