破壊靱性に対する材料非均質性の影響 : 温度勾配の影響

概要

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The numerical analysis was performed to estimate the effect of material inhomogeneity induced by a temperature gradient on fracture toughness for SM 490 A steel. The temperature gradient in the specimen creates change in plastic properties at a position to the position to bring about inhomogenity in the specimen. The experimental result shows the material inhomogeneity tends to change the fracture toughness from the expected one for the crack tip material property. In the numerical analysis, void volume fraction was used for a dimple fracture criterion, and a set of critical values of plastic strain, stress triaxiality and principal stress was taken as a cleavage fracture criterion. The stress and strain distributions at the same J-integral are different between the homogeneous and the inhomogeneous materials. The numerical results agreed with the experimental result that the material inhomogeneity induced by the temperature gradient has a significant effect on the fracture toughness.
一般社団法人日本機械学会の論文
2005-03-25