The Thickness Effect of the Side-Grooved CCT Specimen : (Fracture Toughness of SUS316 Steel)

概要

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J_<IC> tests were carried out on SUS 316 steel by means of the JSME R-curve method as well as the JSME streched-zone width (SZW) method. The effects of side-grooves on the J_<in> value at the onset of stable crack growth were investigated using CCT specimens of two thicknesses (B=1 mm and 2 mm). The ratio of the net thickness to the gross thickness was maintained at 0.5. The J_<in> value of the side-grooved specimen of 2 mm thickness was smaller than that of the standard CCT specimen. Further, as the thickness of the specimen became thinner, the J_<in> value decreased. In the case of 1 mm-thick CCT specimens with or without a side-groove, the contraction percentage of thickness was very large so that it was not appropriate to use these specimens for the fracture toughness test. In the case of the thin or side-grooved CCT specimens, the J-value, which is evaluated from the load versus displacement curve using Rice's formula, cannot estimate the J-integral at the central part of the specimen. Therefore, a J-integral estimation method would have to be established using 3-D elastic-plastic analysis.
一般社団法人日本機械学会の論文
1988-10-15