On the measurement of total entropy generation for determining fatigue fracture
Document Type
Article
Publication Date
12-1-2024
Abstract
A novel approach to measuring the rate of plastic work during fatigue using a thermodynamic modeling framework is presented. The temperature profile and temperature gradient are utilized to measure the total accumulated entropy throughout the fatigue degradation process. It is shown that for cases in which temperature does not reach a steady state condition, such as very low-cycle fatigue (VLCF), or in instances of a low-temperature rise, the model can reliably quantify the total entropy generation. Experimental tests are conducted on carbon steel 1018 flat dog-bone specimens using a fully reversible bending fatigue tester and aluminum 6061-T651 cylindrical dog-bone specimens under tension–compression cyclic loading. The obtained results demonstrate the model's capability to accurately measure the plastic work rate, eliminating the need to capture the initial temperature slope or interrupt the fatigue test to measure the cooling rate.
Publication Source (Journal or Book title)
International Journal of Fatigue
Recommended Citation
Amooie, M., Wilson, P., Mahmoudi, A., Azizian-Farsani, E., & Khonsari, M. (2024). On the measurement of total entropy generation for determining fatigue fracture. International Journal of Fatigue, 189 https://doi.org/10.1016/j.ijfatigue.2024.108578
