Abstract
Study on unstable ductile fracture of nuclear primary piping becomes very important from the viewpoint of plant safety because of frequent discoveries of the stress corrosion cracking. The authors have performed the analysis of ductile crack extension in center cracked plate specimens of type 304 stainless steel. In this study, pipes with a circumferential crack are taken as an object of the analysis. At first, a simple estimation formula for the J-integral of the non-growing and growing cracks is proposed and validity is checked using the fully plastic solutions. Next, ductile crack extension is analyzed by the three-dimensional finite element method. The J-integral obtained by the virtual crack extension method agrees well with the values obtained by the simple estimation formula up to the crack extension of about 40 mm. Finally, the dependency of the J-integral resistance curve on the specimen geometry is examined by the comparison to other data.
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