窒化珪素と炭化珪素の破壊靭性の簡便評価手法の検討

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  • Simple Evaluation Method of Fracture Toughness for Si3N4 and SiC.
  • チッカ ケイソ ト タンカ ケイソ ノ ハカイ ジンセイ ノ カンベン ヒョウ

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A simple technique was developed to introduce fatigue precrack to a through-notched compact specimen of Si3N4 and SiC. First, a compressive load was applied to introduce damage at the notch tip. Nucleation of damage can be easily detected by a pop-in sound. Then, a fatigue crack was introduced by cyclic tensile loading. By using precracked specimens, usefulness was confirmed for fracture toughness, fatigue crack growth, and stress corrosion cracking tests. In both cases, it was found that fracture mechanics characteristics are successfully evaluated when the fatigue crack increment from the notch tip was larger than the notch tip radius.

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