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- Title
Estimating the intrinsic dissipation using the second‐harmonic temperature signal in the tension–tension fatigue.
- Authors
Ricotta, Mauro; Meneghetti, Giovanni
- Abstract
The intrinsic dissipation experienced by a metal under tension–tension fatigue is linked to the second‐harmonic temperature signal obtained from Fourier analysis. According to the proposed model, self‐heating due to intrinsic dissipation spreads out into all harmonics of the temperature signal, including that modulated at the same frequency as the applied load, which primarily captures the thermoelastic effect. Furthermore, the model is adapted to estimate the intrinsic dissipation starting from the second‐harmonic temperature if the command signal generated by the closed‐loop digital controller of the fatigue test machine is not a pure sine wave modulated at the desired load test frequency but contains high‐order harmonics. Finally, the theoretical model is applied to measure the intrinsic dissipation during stepwise fatigue tests on plain specimens made of C45 normalized steel, and the results obtained are validated using a previously well‐established approach. Highlights: A model is defined for estimating the intrinsic dissipation in tension–tension fatigue.The model requires the range of the second‐harmonic temperature of the material.The model cleans high‐order harmonics generated by the controller of the test machine.The model is successfully validated through fatigue tests on C45 normalized steel.
- Subjects
FATIGUE testing machines; FOURIER analysis; SINE waves
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2023, Vol 46, Issue 11, p4218
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.14132