Journal
RUSSIAN METALLURGY
Volume 2022, Issue 10, Pages 1117-1124Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S003602952210007X
Keywords
Ramberg-Osgood law; stress-strain curves; fatigue equations; Wohler diagrams
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Funding
- Russian Foundation for Basic Research [20-01-00517A]
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This paper compares three lifetime models for materials within the framework of the hypothesis of accumulation of residual strains. The models are based on the Ramberg-Osgood law, an alternative empirical law, and a theoretical law constructed from the solutions of various differential equations in linear and nonlinear sections in a stress-strain curve. It is shown that postulating a linear section in a stress-strain curve leads to the fact that the endurance limit is determined by the point of proportionality limit.
Three material lifetime models are compared within the framework of the hypothesis of accumulation of residual strains. The models are based on the Ramberg-Osgood law, an alternative empirical law, and a so-called theoretical law constructed from the solutions of various differential equations in linear and nonlinear sections in a stress-strain curve. Postulating a linear section in a stress-strain curve is shown to automatically leads to the fact that the endurance limit is determined by the point of proportionality limit.
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