Abstract
A hypothesis of plastic adaptation has been proposed and modeled as one idea that is available to link micros- and macro-scopic approaches to fatigue problems. Based on the hypothesis, an equivalent cyclic stress ratio has been formulated as a useful parameter for correspondence between cyclic stress conditions of notched and unnotched specimens. In the present study, the rationality of the hypothesis and its application to multi-axial fatigue problems are discussed from a viewpoint of micro- and macro-mechanics.
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