Abstract
Three single-specimen test methods of analyses have been applied to obtain the fracture toughness at room temperature of a low alloy pressure-vessel steel from tests on invalid compact tension specimens in which thickness varied from 50.8 mm to 12.7 mm and width varied from 101.6 mm to 25.4 mm. The three analyses, Rice's formula for the J-contour integral, Witt's equivalent energy method, and the Chell and Milne curve-fitting method, all gave fracture toughness values in excellent agreement with each other. For this material, the fracture toughness appeared to increase with decreasing thickness for the constant width, variable thickness specimens. Slow crack growth occurred in all the specimens of 12.7 mm thickness, but was not detected optically on the fractured surfaces in the thicker specimens.
Published Version
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