Document Type
Article
Publication Date
7-3-2018
Abstract
High-frequency testing (HFT) is useful for accelerated fatigue testing of conventional materials that typically serve under low-frequency loading conditions, as well as for the assessment of the robustness of microelectromechanical systems which typically experience high-frequency service conditions. Using discrete dislocation dynamics, we attempt to elucidate the effect of loading frequency on the reversibility of cyclic deformation. We demonstrate that the HFT induces a higher fraction of reversible cyclic deformation because of a larger portion of elastic/anelastic deformation due to limited dislocation mobility, and a higher degree of reversibility in plastic deformation owing to the less occurrence of cross-slip. (Image presented) IMPACT STATEMENT Dislocation-based frequency effects on high-cycle deformation reversibility in metals are elucidated. Hysteresis energy is shown to dissipate even under ideal, damage-free conditions, contrary to popular assumptions of energy-based fatigue models.
Publication Source (Journal or Book title)
Materials Research Letters
First Page
390
Last Page
397
Recommended Citation
Shao, S., Khonsari, M., Wang, J., Shamsaei, N., & Li, N. (2018). Frequency dependent deformation reversibility during cyclic loading. Materials Research Letters, 6 (7), 390-397. https://doi.org/10.1080/21663831.2018.1469172
