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- W335232034 abstract "Accurate estimates of valid plane-strain fracture toughness, K I c , for low-alloy steels in the ductile-to-brittle transition temperature range may be made by using J I c -valid specimens and accounting for a size effect evident for cleavage fracture. The size effect is explained using a link theory that predicts variance in test results using constant-size specimens and decreasing average results when the specimen size is increased. Cleavage fracture occurs when the maximum tensile stress near the crack tip equals or exceeds the cleavage stress, σ f *, over a microstructurally significant distance, the process-zone diameter. Variation in specimen toughness arises due to variations in the microstructure within the process zone; the weakest feature in the process zone causes catastrophic cleavage fracture of the specimen. Our work indicates that the size effect on J I c is represented by J 1 /J 2 = (B 2 /B 1 ) 1 / m where m is the Weibull modulus, B i is the specimen thickness for specimen i, and J i is the mean J I c for several specimens. Experimental evidence supporting the theory is shown." @default.
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- W335232034 date "2009-03-17" @default.
- W335232034 modified "2023-09-26" @default.
- W335232034 title "Small-Specimen Brittle-Fracture Toughness Testing" @default.
- W335232034 doi "https://doi.org/10.1520/stp28819s" @default.
- W335232034 hasPublicationYear "2009" @default.
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