Abstract
AbstractThe kinetic concept of the strength of solids is used to determine the fatigue life of stress‐controlled cyclic loading and evaluate the fracture fatigue entropy. Unlike the traditional stress or strain‐based models, this theory uses the applied stress amplitude and the specimen's surface temperature to determine the lifetime. The degradation fraction in each cycle is used to calculate the life cycle. Then the material parameters of the final life equation are obtained for two materials: low carbon steel 1018 and aluminum 7075‐T6. The number of cycles to fracture and the cyclic plastic strain energy ( ) are used to calculate the fracture fatigue entropy (FFE). It is shown that the life cycle prediction of the proposed model agrees well with the experimental results from the literature. Results provide further evidence for the constancy of FFE.
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