サイドグルーブ付きＣＣＴ試験片の板厚効果に関する研究　Ｉ　　ＳＵＳ３１６材の破壊靭性

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  • The thickness effects of the side-grooved CCT specimen. 1st report Fracture toughness of SUS316 steel.
  • サイド グルーブ ツキ CCT シケンヘン ノ イタアツ コウカ ニ カンスル

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JIC tests were carried out on SUS 316 steel by means of the JSME R-curve method as well as the JSME stretched-zone width (SZW) method. The effect of side-grooves on the Jin value at stable crack growth initiation was investigated by using CCT specimens of two thicknesses (B=1, 2mm). The ratio of net thickness to gross thickness was kept at 0.5. The Jin values of the side-grooved CCT specimens of two thicknesses were considerably smaller than those of the 1TCT specimen. The Jin value of the side-grooved specimen of 2mm thickness was smaller than that of the standard CCT specimen. Further, as the thickness of the specimen becomes thinner, the Jin value decreases. In the case of 1mm thick CCT specimens with or without a side groove, the contraction percentage of thickness is very large so that it is not appropriate to use these specimens for the fracture toughness test. In the case of the thin or side-grooved CCT specimen, the J value which is evaluated from the load versus displacement curve by 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 by using 3-D elasto-plastic analysis.

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