Abstract
A steel component can be assumed to be a wide plate and it contains an open hole of radius 20 mm. A radial crack of length 1.5 mm was detected at the hole. Regulations suggest that for the component to be functional, the maximum allowable crack length is 2.5 mm. The component is subjected to a constant amplitude fatigue loading from 0 to 100 MPa. Estimate the number of fatigue cycles for the crack to reach the allowable length. The material obeys the following fatigue crack growth rule: da / dN = 6.9 × 10−12 (∆K)3, with da / dN in m/cycle and ∆K in . For a crack originating from a hole, the stress intensity factor is given by, (1) where (2)
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