Summary
The paper is designed to develop the two-parameter failure criterion for describing the growth of fatigue cracks under conditions of high-temperature fatigue. The criterion can be used with laboratory tests on specimens to construct kinetic diagrams for fatigue failure such as would be given if the requirements of linear failure mechanics were met. The initial data are the v-ΔKeff fatigue failure diagrams, which are effective ones incorporating crack closure, so one can derive v-ΔKv theoretical diagrams as conservative characteristics for a material for crack growth under conditions of planar strain.
The two-parameter criterion enables one to incorporate the effects of frequency and cycle asymmetry at high ΔK, where there are changes in crack growth rate due to changes in the rate of plastic strain at the crack vertex. At low ΔK, the effects of loading frequency are additionally determined by the crack closure, the blunting, and the physicochemical action of the medium, which restricts the scope for using the two-parameter criterion to construct fatigue-failure kinetic diagrams invariant with respect to frequency.
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Translated from Fiziko-khimicheskaya Mekhanika Materialov., Vol. 26, No. 5, pp. 9–19, September–October, 1990.
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Romaniv, O.M., Nikiforchin, G.M., Student, O.Z. et al. A two-parameter damage criterion and high-temperature fatigue crack growth in a corrosion-resistant steel. Mater Sci 26, 497–505 (1991). https://doi.org/10.1007/BF00732700
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DOI: https://doi.org/10.1007/BF00732700