常圧焼結窒化ケイ素の多軸応力下の破壊挙動(第2報)

概要

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Four-point shear bending tests were carried out at room temperature to study the fracture criteria for the large crack of sintered silicon nitride under a mixed-mode. The data of stress intensity factor under mode I and II agreed with the G-criterion. Ring-on-ring tests and ball-on-ring tests were also performed to investigate the fracture behavior of sintered silicon nitride under tension-tension equibiaxial stresses. The experimental results were compared with the predicted strength based on the Weibull statistical theory and various fracture criteria. The strength under tension-tension stresses agreed with the predicted strength based on shear sensitive criteria for natural flaw. In the previous work, the strength of sintered silicon nitride under tension-compression biaxial stresses agreed with the predicted strength based on shear insensitive criteria. In this paper, it was proposed that the modified G-criterion is applicable to the prediction methodology for fracture strength of ceramic component under both tension-tension and tension-compression biaxial stresses.
社団法人日本セラミックス協会の論文
1991-07-01