期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 93, 期 -, 页码 387-396出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.05.019
关键词
Very high cycle fatigue; Failure mechanisms; Microstructure effects; Mesoscale modeling
资金
- NSF [CMMI-1333083]
- Carter N. Paden, Jr. Distinguished Chair in Metals Processing at Georgia Tech.
Advances in higher resolution experimental techniques have shown that metallic materials can develop fatigue cracks under cyclic loading levels significantly below the yield stress. Indeed, the traditional notion of a fatigue limit can be recast in terms of limits associated with nucleation and arrest of fatigue cracks at the microstructural scale. Although fatigue damage characteristically emerges from irreversible dislocation processes at sub-grain scales, the specific microstructure attributes, environment, and loading conditions can strongly affect the apparent failure mode and surface to subsurface transitions. In this paper we discuss multiple mechanisms that occur during fatigue loading in the high cycle fatigue (HCF) to very high cycle fatigue (VHCF) regimes. We compare these regimes, focusing on strategies to bridge experimental and modeling approaches exercised at multiple length scales and discussing particular challenges to modeling and simulation regarding microstructure-sensitive fatigue driving forces and thresholds. We conclude by discussing some of the challenges in predicting the transition of failure mechanisms at different stress and strain amplitudes. (C) 2016 Published by Elsevier Ltd.
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