Energy criteria for fatigue fracture of a heat-resistant nickel alloy

Ryzhkov P.V., Gorbovets M.A., Khodinev I.A.
Ryzhkov P.V., Gorbovets M.A., Khodinev I.A. Energy criteria for fatigue fracture of a heat-resistant nickel alloy // Proceedings of VIAM. 2023. No. 11. DOI: 10.18577/2307-6046-2023-0-11-111-122. URL: https://test.viam.ru/en/journal/2023/11/11
Keywords
mechanical properties, fatigue characteristics, high-temperature wrought nickel alloys, strain energy density, Manson–Coffin and Ramberg–Osgood equations
Abstract

Tests for low-cycle fatigue of a heat-resistant nickel alloy were carried out at operating temperature, deformation of tensile cycle and a frequency of 1 Hz. On the example of the obtained data of elastic-plastic deformation, the material constants of the Manson–Coffin and Ramberg–Osgood equations are determined. The main relationships that use the energy of destruction, necessary for predicting fatigue life, are considered. It is shown that the application of the energy criterion in terms of the accumulated strain energy density parameter more accurately describes the fatigue behavior in the low-cycle fatigue regime. The data obtained will make it possible in the second part of the article to use the energy criterion to predict the durability of the alloy under study under conditions of stress concentration.

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