ルート部の応力集中率におよぼす開先形状, 板厚, のど厚, ルート角度の影響

概要

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Concerning root crack belonging to hydrogen induced cold cracking, many researches have been done from mechanical and metallurgical points of view. Concept of restraint intensity is proposed to indicate quantitatively the conditions for prevention of root crack in Japan. Restraint intensity is related with average net stress and strain in weld metal, but it is not related with local stress and strain at the root of weld. According to researches in fracture mechanics field, crack initiation is considered to be a function of local stress or strain at a point where cracking is expected. Local stress at the root of weld will be one of useful informations for studying on root crack. In this report, effect of joint geometry on local stress or stress concentration factor at the root of weld is studied by use of finite element method based on two dimensional elasto-plastic theory. The conclusions obtained in this report are summarized as follows : 1. Stress concentration factor at the root in the first-pass welding is changed considerably with groove type. It is increased with the decreased of root angle and with the increase of plate thickness and throat depth. (See Table 3) 2. Conventinal equation for determining stress concentration factor as a function of thickness, throat depth and root angle is given. (See equation (1), Table 4,Figs. 6,7)
社団法人溶接学会の論文
1979-05-05