ブリッジング材料の有効き裂先端破壊じん性値の測定法

概要

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A method for measuring the effective crack tip fracture toughness, (K_<tip>)_c, for bridging materials such as polycrystalline ceramics or fiber-reinforced ceramics is proposed in this paper. The value of (K_<tip>)_c approximately coincides with the apparent fracture toughness, K_c, when using a bending specimen with an adequately deep crack. The stress intensity factor for the bending specimen with a deep crack increases very rapidly with crack extension. Therefore, the bending specimen with a deep crack fractures without stable crack propagation which causes the R-curve behavior and the deference between K_c and (K_<tip>)_c. The volue of (K_<tip>)_c for polycrystalline alumina is evaluated according to the present proposed method. The measured (K_<tip>)_c is almost identical with that determined by numerical analysis.
社団法人日本材料学会の論文
1997-02-15