応力をうけるセラミックスの純水中室温下での破壊挙動

概要

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The characteristics of static or cyclic fatigue crack growth initiation of two ceramics (alumina(Al_2O_2) and partially stabilized zirconia (PSZ) under tensile loading have been investigated in high purity water at room temperature. The time to crack growth initiation. t_g, at static and cyclic fatigue tests in water was shorter than that in air. In addition, it decreased markedly with increasing K_I or ΔK_I. From the observation of fracture surface for static and cyclic fatigue by SEM, it was shown that fracture surface was the mixed type of intergranular and transgranular cracking in alumina and intergranular cracking in PSZ. Fracture behavior under cyclic loading revealed the occurrence of time -dependent crack growth initiation in alumina and cyclic-dependent one in PSZ. The reason why the fracture time decreased by cyclic fatigue for PSZ is considered to result from the promotion of interaction between fatigue crack and microstructure, such as microcracking and phase transformation in the process zone, and the activation of hydration reaction at the crack tip.
社団法人日本材料学会の論文
1991-08-15