Abstract
The critical crack opening displacements (COD's) of three medium strength structural steels were measured over a range of temperature, using single notched three point bend specimens, and these were compared with data obtained from Charpy tests conducted over the same temperature range. The critical COD for HY60 was found to be 0.07 mm at −20 °C and to rise through a sharp transition at +20 °C to 0.24 mm at +23 °C. The other steels were titanium modified steels which showed COD transitions at −30 °C and +70 °C, the transitions being very sensitive to the amount of titanium added. The relative toughness of these steels was related to the stretched zone size and the shear lip size. The fracture toughness was also compared with the energy measured in a Charpy impact test.
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