AE Measurements and Fracture Toughness Evaluation in Indentation Test for Alumina Ceramics

抄録

Vickers and Knoop indentation tests were performed on alumina ceramic specimens by 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 a 2-parameter Weibull distribution function, while those in Knoop indentation test seem to obey a combined Weibull distribution function. The ratios of the numbers of the specimens, in which Pth was 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.