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where LE, LK, and a are the crack length, crack length from the center of the fracture surface to the crack front, and the total crack length, respectively. b is a constant related to the fatigue strength of the fatigue test specimen, while E, G, and ν are the elastic modulus, shear modulus, and Poisson's ratio of the material of the specimen, respectively. A10 is the average fracture toughness within the area A in Figure 2, A30 is the fracture toughness under the maximum crack growth rate of 10%, B10 is the fracture toughness under the maximum crack growth rate of 30%, and Sf is the mean stress intensity factor within the area B in Figure 2.
three major factors must be chosen correctly to ensure that the fatigue life obtained with the statistical fatigue life formula is reliable. First, it is important to choose an appropriate statistical formula. The appropriate result is predominantly obtained by using the statistical fatigue life formula developed by Sander and Piaszkowski for single-edge notched three-point bending tests of steel plates [17]. It can be seen from the experimental fatigue data that the Sf values calculated by the statistical fatigue life formula for a corrosion level of 50% are very close to the Sf values calculated by finite element simulation. d2c66b5586