溶接学会論文集
Print ISSN : 0288-4771
三次元溶接高温割れ解析法の開発と狭開先溶接時における梨形ビード割れ問題への応用
柴原 正和伊藤 真介芹澤 久正岡 孝治村川 英一
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ジャーナル フリー

2009 年 27 巻 1 号 p. 81-88

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The objective of this research is to develop a 3D finite element method (FEM) for hot cracking using temperature dependent interface element. Proposed method can predict the formation and extension of hot cracking. It includes Iterative Substructure Method (ISM) which can reduce the computational time with keeping high accuracy.
In this study, proposed method is applied to the problem of pear-shaped bead cracking under narrow gap welding. The applicability and the validity of the method are verified through serial computations. The computed results show that proposed method can simulate pear-shaped bead cracking and surface cracking which are distributed along the longitudinal cross section in welding line. Additionally, it is found that when the weldment is penetrated to the back of plate, pear-shaped bead cracking is difficult to form. The computational speed of the method using ISM increases by about 7 times faster than the method which doesn't use ISM.

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