Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 139, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105673
Keywords
Strain controlled fatigue; Dislocations; Cyclic hardening; Steel
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A novel method is offered with the task of unveiling the underlying micro-mechanisms of cyclic deformation. This method by merging of dwell-fatigue and stress relaxation concept provides the capability of assessment of the dislocation response to cyclic deformation and subsequently the differences between tensile and compressive half-cycles behavior. Interestingly, the apparent activation volume and mobile dislocation density have been successfully calculated in the course of cyclic loading. Noteworthily, room-temperature dynamic strain aging is firmly proved through these novel findings in a cyclically-loaded lightweight steel. This promises to be a breakthrough in deep understanding the behavior of materials under cyclic loading.
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