加工損傷を有するセラミックスの強度信頼性評価

概要

論文の詳細を見る
The main objective of this study is to evaluate the strength reliability of ceramics with machining damages under cyclic loading. The conceptual algorithm for application of linear fracture mechanics is proposed to the strength reliability evaluation of ceramic component. Also the machining damages in ceramic component are converted by the multiple cracks model with same crack length and crack spacing in order to analyze. The stress intensity factor on the ceramics with multiple cracks under the cyclic loading is discussed in connection with the crack spacing and the crack propagation length with no failure. On the other hand, the fatigue crack growth parameters C and m, and the fatigue fracture toughness value K<SUB>fc</SUB> of ceramic component are calculated from the result of a cyclic four point bending test. Further, statistical characteristics of the C, m and Kfc for the ceramics with multiple cracks are estimated from Weibull distribution function in the ceramics with single crack, which was discussed in the previous paper. This analytical method could be applied to predict the life of ceramics with various machining damages. Two examples of the life of PSZ ceramics with laser and grinding damages are indicated using the analytical method proposed in this paper and by the repeated four point bending test, and then the experimental result has agreed with the analytical result.
社団法人粉体粉末冶金協会の論文