複数き裂の相互作用を考慮したき裂進展評価手法

概要

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When stress corrosion cracking or corrosion fatigue occurs,multiple cracks are frequently initiated in the same area. According to section XI of the ASME Boiler and Pressure Vessel Code, multiple cracks are consider as a single combined crack in crack growth analysis, if the specified conditions are satisfied. In crack growth processes, however, no prescription for the interference between multiple cracks is given in this code. Even if the cracks are initially located far away from each other, as cracks become closer due to crack growth, the interference becomes larger. Therefore, the interference effect on the crack growth process should be considered. The JSME Post-Construction Code, issued in May 2000, prescribes the conditions of crack coalescence in the crack growth process. This study aims to extend this prescription to more general cases. In this study, a simulation model was applied, to simulate the crack growth process, taking into account the interference between two cracks. This model made it possible to analyze multiple crack growth behaviors for many cases (e. g. different relative position and length) that could not be studied by experiment only. Based on these analyses, a new crack growth analysis method was suggested for taking into account the interference between multiple cracks.
一般社団法人日本機械学会の論文
2001-08-25