セラミックスの破壊強度特性と統一的評価法

概要

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Application of ceramics to medhanical and structural components requires, for a strength design or a quality control, to dial with the strength as a material constant independent of either testing methods or the shapes and sizes of specimens. Therefore, we propose the analysis method for estimeting commonly the material intrinsic strength from all the data obtained by tensile, bending, creep and fatigue tests at the same temperature. The fracture strength of commercial engineering vceramics is sssumed to be governied by crack grouth properties from an initial flaw larger than a grain ie byaabtistics in considering the effective hold time of applied stress and the effective volume at the same time, the strength can be expressed commonly as follows σ_f(N_ft_<eff>)^<nf>=<σ>^^~_<f0>√^<m>^^^<ln(1-P_f)^<-1>/V_<eff>> where n_f is the strength decrement index and equals to the inverse of crack growth rate index n, and <σ>^^~_<f0> is the strength normalized for cumulative effective hold time N_ft_<eff>=1 (sec) and effective volume V<eff>=1 (mm^3). The extimating method proposed here is useful for making a reliability design or a quality control for ceramic components requiring lot quaity checks.
社団法人日本材料学会の論文
1989-07-15