The occurrence of brittle failures in welded structures has inspired many investigations of the notch toughness of steels, and as a result of this work many different laboratory tests for evaluating notch toughness have been proposed. It is naturally desirable to establish the degree of correlation among results of the different tests, and to assess the significance of test results in terms of service behavior. These issues are discussed in the light of an extensive literature search and experimental investigations.
Correlation of test results is facilitated by separate considerations of ductility and fracture transition temperatures. The ductility transition temperature is the lowest temperature at which a notched steel specimen will exhibit significant plastic deformation prior to crack initiation while the fracture transition is the lowest temperature at which crack propagation is predominantly by ductile shear. The ductility transition temperature invariably occurs at or below the fracture transition temperature. Numerous observations suggest that the ductility transition temperature should correlate best with service experience.
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| Number of Pages : | 34 |
| Published : | 1960 |
