セラミックスの強度信頼性評価-1-評価アルゴリズムの提案とPSZの寿命予測

概要

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The main objective of this study is to evaluate the strength reliability of ceramics for mechanical com-ponent applications based on fracture mechanics. This paper discribes an algorithm for the strength reliability evaluation of ceramics and prediction of the life of PSZ (Partially Stabirized Zirconia) components according to the proposed algorithm. Extensive crack growth is observed prior to the final fracture during cyclic three-point bending and it is confirmed that PSZ exhibits a linear relationship on logarithmic scale between the fatigue crack growth rate da/dN and the stress intensity factor range ΔK. Statistical charac-teristics of the crack growth rate parameters C, m and the fatigue fracture toughness value K<SUB>fc</SUB> are also found to fit well with Weibull distribution. It was found that the estimated life of PSZ components decreases with increasing stress range and initial crack length and with decreasing fracture probability.
社団法人粉体粉末冶金協会の論文