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Fracture Toughness and Crack Growth Measurements with 'C' Shaped Specimens.
WATERVLIET ARSENAL N Y
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A series of C shaped fracture toughness specimens from 4330 steel forged cylinders have been tested using the general test procedure recommended by ASTM-E399. A wide range of specimen sizes were tested and no significant size effect on the fracture toughness, as measured by this specimen, was found. Crack growth during fracture toughness tests was measured using an ultrasonic technique. Based on these results and on a compliance analysis, the use of a five percent secant offset fracture criterion is recommended for this specimen. Standardized specimen dimensions for use of the C shaped specimen for testing a variety of thick-walled cylinders are recommended. Author
APPROVED FOR PUBLIC RELEASE