点集束探触子を用いた超音波法による A533B-1 鋼の破壊靱性の測定

概要

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A single specimen method for determining fracture toughness J_<IC> has been studied using both ultrasonic through transmission and angle beam reflection techniques. Compact tension specimens of A533B-1 steel were used. By the use of point focusing probes, the crack extension in the midthickness portion of the specimen is measured. A computer is utilized in the measuring system for controlling apparatus, recording data, and calculating J values. The fracture processes such as blunting of precrack tip, stable crack extension and transition process between them can be revealed by this method. The J_<IC> value obtained by ultrasonic method is in close agreement with that obtained by R-curve method. Furthermore, crack growth resistance curve (J-R curve) can be determined because there is a linear relation between amount of relative decrease in through transmission pulse height and crack extension length.
社団法人日本鉄鋼協会の論文
1985-08-01