The Effect of Strain Rate on the Toughness of Ship Steels.
Final technical rept.,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
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Yield strength and fracture toughness, as measured by the dynamic tear test, were determined as a function of load rate and temperature for several ship primary structure steels in strength ranges up to 100 ksi. The materials used were ABS-B, DS, AH-32, EH-32, CS, A517-D, A678-C, and A537-B, in one or two heats each. The effect of notch geometry, i.e., fatigue precracked vis-a-vis pressed notch, was investigated in some of the tests. By fully instrumenting some of the tests, the energy to maximum load as well as the total energy to failure was determined. Based on these energies, the resistance of the materials to crack initiation and to propagation could be examined. The results indicate potentially different fracture behavior between the high and low strength alloys. This in turn has implications in terms of the Ship Structure Committee Report SSC-244 proposed fracture criterion for qualifying toughness and crack arrest properties of ship steels and weldments. Author
- Metallurgy and Metallography