セラミックスの破壊強度に及ぼすき裂形状の影響の定量的評価

抄録

In order to clarify the influence of various shaped surface crack on fracture strength of Al₂O₃/SiC ceramics, three-point bending tests were carried out. The tilted surface cracks or multiple surface cracks were introduced on the specimen surface. Test results showed that √area is available as a representative parameter of defect size for fracture strength evaluation. Evaluation equation of fracture strength based on the process zone size fracture criterion and the √area parameter was proposed. The predicted fracture strengths were in good agreement with the experimental fracture strengths.