数種類の鋼のJ_<IC>試験におけるストレッチ・ゾーン幅とき裂先端開口変位

概要

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Deformation of stretched zones during stable crack growth (stages II and III) in J_<IC> tests was examined by observing stereographically relations between apparent critical stretched zone width (SZW_C) and crack tip opening desplacement. The average value of the apparent SZW_C along the crack from continued to increase with increase in J during the extension of tear region along the crack from from 20%, at which crack initiation and SZW_C were defined by the JSME standard, to 100% in length (stage II). In the stable tear crack growth stage (stage III), SZW_C was also deformed consiferable with low-strength high-toughness steels and, to a lesser extent, with high strength high-SZW_C steel and medium-strength steel, but not with high-strength low-SZW_C steel. A new procedure of SZY method was proposed to obtain J_<IC> values compative with those by the R-curve method, by avoiding errors due to the SZW_C deformation.
1984-02-25