Abstract
Investigations have been carried out to find the effect of pre-straining on the fatigue crack propagation in stainless steel and mild steel and on the fatigue strength of stainless steel. It has been observed that with increasing pre-strain, the crack nucleation is delayed at a given stress level and the rate of crack propagation is decreased at a given crack length. The maximum stress intensity factor, K max, bears a relation with the crack growth rate in the form d l/d N = A( K max) q , where q varies from 2 to 2.4. The endurance strength of stainless steel under rotary bending has been found to increase sharply from 25 kg/mm 2 to 30 kg/mm 2 and 40 kg/mm 2, for pre-straining values of 10% and 20% nominal plastic strain respectively. Assuming an energy balance during the crack growth, a theoretical approach has been made to explain the experimental findings.
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