"I am pleased to share, Dr. Hsiao Wei Lee's recent work, “A unified mechanics theory framework for fully reversed high cycle fatigue of FCC aluminum based on two-scale microplasticity entropy production,” has been published online in the International Journal of Fatigue.
This study investigates the high-cycle fatigue life behavior of FCC aluminum alloys under fully reversed loading within a conventional frequency range of 0.5–10 Hz, using Unified Mechanics Theory (UMT). In UMT, cumulative entropy production at a material point drives a thermodynamic state index (TSI) at that material point, which serves as the degradation variable in this study. Because the maximum nominal stress remains below the material's yield strength, we use a two-scale microplasticity model in which the global matrix remains linear elastic while a small volume fraction fv undergoes localized microplastic deformation. An Eyring-type flow equation describes microplastic flow without imposing an explicit fatigue threshold.
The simulations show that even very small microplastic dissipation can accumulate over many loading cycles when the nominal stress is much lower than the yield strength. The predicted fatigue lives are compared with available experimental data, and a series of parameter sensitivity and interaction studies are also performed to examine how the selection of model parameters may influence the predictions."
Below is the 50 days' free access link:
https://lnkd.in/gU322cQi
| Attachment | Size |
|---|---|
| Paper | 6.52 MB |