Conclusions
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1.
On the basis of experimentally obtained rules of unstable crack growth in constructional alloys, a model of transition from fatigue growth of a crack to brittle failure in cyclic loading of constructional alloys made it possible to propose plans of unstable fatigue crack growth and brittle failure of constructional alloys under cyclic loads, which makes it possible to predict the rules of unstable crack development in the transition from fatigue to brittle failure and to determine the criteria controlling the resistance to brittle failure of materials under cyclic loads (Kfc 1, KIc, and KDc).
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2.
On the basis of the proposed model and plans of unstable fatigue crack development and also of knowledge of the relationship of the current value of KI to crack size, it is possible to predict the rules of unstable fatigue crack development in design elements and structures and to determine the criteria controlling the resistance to brittle failure in them, which makes it possible to more soundly formulate the principles of check calculations of design elements and structures for strength and life under cyclic loads in the presence of crack type defects in them.
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Translated from Problemy Prochnosti, No. 12, pp. 14–17, December, 1980.
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Troshchenko, V.T., Pokrovskii, V.V. Influence of loading cycle on the crack resistance characteristics of steels. Report 2. Strength Mater 12, 1477–1480 (1980). https://doi.org/10.1007/BF00762145
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DOI: https://doi.org/10.1007/BF00762145