Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 102, Issue -, Pages 1-8Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2017.04.007
Keywords
Cyclic slip plastic irreversibility; Low-cycle fatigue; Manson-Coffin fatigue crack initiation law; Ni-base superalloy; Atomic force microscopy (AFM)
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The opportunity to define a microscopic law of fatigue crack initiation using Manson-Coffin law formulated in terms of cyclic slip irreversibility deduced from AFM measurements is discussed for a polycrystalline superalloy with different grain sizes and precipitate sizes. The results show that the modified Manson-Coffin law, relating cyclic slip irreversibility parameter to fatigue crack initiation life, is sustained through a two-parameter power law: ef and c. The analysis suggests that the exponent c-value can be related to the degree of plastic strain incompatibility between grains, and the cumulative irreversible cyclic plastic strain to crack initiation is a relevant damage indicator for crack initiation. Consequently, our approach allows giving a physical base of engineering law. (C) 2017 Elsevier Ltd. All rights reserved.
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