アルミナの圧子押込み試験におけるＡＥ計測と破壊じん性

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  • AE Measurements and Fracture Toughness Evaluation in Indentation Test for Alumina Ceramics
  • アルミナ ノ アッシ オシコミ シケン ニ オケル AE ケイソク ト ハカイ

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Vickers and Knoop indentation tests were performed on alumina ceramic specimens with measuring acoustic emissions. In Vickers indentation test, the Weibull plots of the threshold load Pth, at which total AE energy begins to burst, seem to obey 2-parameter-Weibull distribution function, while those in Knoop indentation test seem to obey the combined Weibull distribution function. The ratio of the numbers of the specimens, in which Pth were observed, versus total numbers of the specimens were 62% in Vickers indentation, and 41% in Knoop@ indentation. Some additional differences were observed between Vickers and Knoop indentation tests.

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