モードI /モードII 繰返し混合荷重下でのセラミックスの破壊挙動

概要

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Fracture behavior of Al_2O_3,PSZ and Si_3N_4 ceramics was investigated under cyclic mode I/mode II mixed-mode loading in high purity water at room temperature.The time to fracture was shorter than that for cyclic mode I loading,and it decreased markely with increasing the mode ratio ΔK_II/ΔK_I.The crack propagation rate was higher than that for cyclic mode I loading,and it increased markedly with increasing the mode ratio ΔK_II/ΔK_I.The time to fracture was much shorter than the predicted based on cyclic mode I loading.The difference between them became larger in the order,Al_2O_3,Si_3N_4,PSZ.In the case of PSZ,the phase transformation from tetragonal to monoclinic took place under the cyclic mixed-mode and mode I loading tests,and there was almost no differnce in the quantity.It was observed that the morphology of fracture surface was different between them,and that the fracture surface in the region of SCG for the mexed-mode loading developed a flat surface which is considered to occur owing to the addition of ΔK_II.
社団法人日本材料学会の論文
1993-09-15