Fracture Toughness of Thin Specimen.

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  • 極薄板試験片の破壊靭性
  • キョク ウスイタ シケンヘン ノ ハカイ ジンセイ

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Three-dimensional elastic-plastic analyses were carried out on 1 and 2 mm-thick CCT specimens with or without side grooves. The valid effective thickness, 0.85√(BO·BN), was obtained from the 3-D analyses. The stretched-zone method is better than the R-curve method to determine the Jin value of the thin specimen. However, a great many data should be gathered near the Jin value. The Jin value obtained using side-grooved specimens is always lower than that of non-side-grooved specimens. Considering the difficulty of machining the side groove, the side groove is not appropriate for the thin specimen. As the thickness decreases, the Jin value decreases. However, it is possible to estimate the JIC value from the Jin value obtained using thin CCT specimens.

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