LOCALISED CYCLIC CREEP IN NOTCHED STEEL PLATES.
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Results from experiments performed on SAE 1043 steel plates show that cyclic creep may occur in a localized region at a notch root, even if the whole member does not exhibit permanent uniaxial deformation. Two different notch geometries were studied. The more sharply notched specimens had a higher rate and a larger zone of cyclic creep. This zone size was about twice as large as the plastic zone size by the first few percent of the life. Four different values for average mean stress were used. Both tensile and compressive cyclic creep were observed. Greater mean stresses caused higher rates and larger zones of cyclic creep. Values for cyclic creep of 1000 microstrain by the first few percent of the life were fairly common. Stress relieving did not appear to cause a significant difference in the cyclic creep rate.
author list (cited authors)
Freed, A. D., Sandor, B. I., & Czoboly, E.