Abstract

The authors have carried out a series of developments on methods to perform natural crack propagation analysis in last several years. This paper describes the results of SCC (stress corrosion cracking) growth analyses under some assumptions on the growth behaviors and assumed stress distributions. The SCC growth was assumed to initiate in the weld metal and to be arrested at the fusion line of weld. Although it is possible to model a realistic configuration of weld, it may take a large amount of modeling and computational cost. Thus, an appropriate simplification for the SCC growth prediction is demanded. Hence, two kinds of welds were considered in the present investigation. One had a realistic configuration. The other was a simplified one whose volume of the weld metal had a rectangular shape. Thus, a further simplification was made such that the cracks were assumed to be rectangular in their shapes. SCC growth analyses were performed by finite element based crack propagation simulation software using a remeshing technique that was developed and has been updated by the authors. The paper describes the method of crack propagation analysis briefly and presents the results of the SCC growth analyses. Some discussions on the simplification of the SCC propagation analysis are presented. Then, it is concluded that an appropriate use of rectangular shaped crack may give a conservative prediction on the SCC growth prediction.

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