Abstract
The influence of a decreasing rate of stress intensity factor with crack propagation, dK/ da , on a stress intensity threshold level, δK th , below which fatigue crack propagation becomes insignificant is investigated. Specimens, 200 mm wide, 10 mm thick with a 40 mm-long central crack, are fatigued at the decreasing rates, ∥ d(δK) da∥ , of 2,44, 5 and 10 kg/mm 5/2 with a peak load control system and a pair of crack followers. In this range of d(δK)/ da , the stress intensity threshold levels, δK th , have the same value regardless of dK/ da . Therefore, the present method of decreasing the stress intensity factor at a constant rate is suitable for determining the characteristic δK th of materials. Furthermore, the influence of stress ratio, R, is investigated at the decreasing rate, ∥ d(δK)/ da] , of 10 kg/mm 5/2.
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