Abstract
Experiments on IS-1020 steel for single tensile overload applied at 12 mm crack length with and without rest time were carried out. The observed retardation effects are presented here and suggested that overload retardation is primarily due to residual compressive stress generated in the crack tip region. On the basis of these experimental results some power laws are developed to predict the decreased number of delay cycles ( N D ) with rest time. The life of the specimen decreased by increasing the rest time after overload. As the magnitude of overload increased the decrease in life is larger for same rest time as compared to lesser overload.
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