多孔質炭化ケイ素の疲労強度と破壊機構(<特集>信頼性工学)

概要

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Static and cyclic fatigue strength in porous SiC ceramics were evaluated using quasi-static and cyclic tests, i. e. load, P, increasing and load range, ΔP, increasing tests, respectively. The evaluation method used Weibull distribution, in which the fracture parameters are stress at failure, σ_f, for quasi-static loading and maximum stress at failure, σ_max, _f, for cyclic loading. The results revealed that the static fatigue behavior had an important role on the fatigue strength. Statistical characteristics of the fatigue strength were expressed by P-S-N curve estimated by the results of ΔP-increasing tests. During the fatigue experiments, crack nucleation was detected using acoustic emission (AE), and the fracture surfaces were observed by SEM. Based on these results, fracture mechanism of the porous SiC ceramics was discussed in detail.
社団法人日本材料学会の論文
2001-01-15