Abstract
1. For 15Kh2MFA (II) high-strength steel, in the fatigue failure of which marked plastic deformations do not develop at the crack tip and plane strain conditions are maintained in specimens from 25 to 150 mm thick, the specimen dimensions do not influence the fatigue crack growth rate and the characteristics Kth and Kfc and in this case the stressed and strained state at the crack tip and the fatigue crack growth rate are clearly determined by the stress intensity factor. 2. For the plastic steels 15Kh2NMFA, 15Kh2MFA (I), and 08Kh18N10T, fatigue failure of which is accompanied by the development of significant plastic deformations at the crack tip, an increase in specimen size has an ambiguous influence on the rule of fatigue crack growth in the whole range of change in KI max from Kth to K Q f . The character of this influence is determined by the actual stressed and strained state at the crack tip, which is dependent both upon specimen dimensions and upon the residual stresses at the crack tip, which are dependent upon the cyclic nature of the elastoplastic deformation. 3. For the investigated steels, which represent a broad class of constructional materials, the fatigue crack growth rate both in the elastic and in the elastoplastic areas is determined by the amount of the crack tip opening, which takes into consideration the influence of specimen dimensions and residual stresses in the area of the crack tip on the stressed and strained state. 4. The relationships between the amount of the crack tip opening and the stress intensity factor obtained in static loading of specimens of different dimensions make it possible to predict the influence of specimen dimensions on fatigue crack growth rate.
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