Abstract
A proposal has been made for the law of fatigue crack propagation rate and may be expressed asda/dN=ΔδT/ΔδiC0 (ΔK) m0where da/dN; rate of fatigue crack propagationΔK; range of stress intensity factorC0, m0; material constantΔδT; variation of crack tip opening displacement from minimum stress to maximum stress in test specimenΔδi; crack tip opening displacement at Kin=ΔK where Kin is stress intensity factor in an infinitely wide plate with a through crack under uniform tension.This equation is in very good agreement with results of fatigue crack propagation test under various stress ratios and with various test configurations. This suggests that C and m in Paris's equation da/dN=C (ΔK) m are affected by load conditions and specimen configurations. It also suggests that a region of accelerated fatigue crack growth leading to rapid terminal failure at high ΔK values, so called “region 3”, might not be appeared in an infinitely wide plate.
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