Cooperative Plane Strain Fracture Toughness Tests with C-Shaped Specimens

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Abstract
The results of a cooperative test program on plane strain fracture toughness (KIc) testing with C-shaped specimens are reported and discussed. Results of 48 tests by eight laboratories using specimens with two different loading hole locations are included. The effects of specimen geometric variables, such as eccentricity of the inner and outer surfaces and nonperpendicularity of these surfaces with the specimen faces, on the measured and calculated KIc are discussed. The C-shaped specimen results are compared with measured KIc values obtained with standard compact specimens. Results show that both versions of the C-shaped specimen yield accurate values of measured KIc. Normal geometric variations, as would be expected from machining of the specimen from an existing hollow cylinder, have no significant effect on the measured KIc.

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