MATEC Web Conf.
Volume 165, 201812th International Fatigue Congress (FATIGUE 2018)
|Number of page(s)||6|
|Section||Crack Initiation Process and First Stages of Crack Propagation|
|Published online||25 May 2018|
A cyclic slip irreversibility based model for fatigue crack initiation of nickel base alloys
School of Mechanical Engineering, Zhengzhou University, 450001 Zhengzhou, China
2 UMR CNRS 7337, Université de Technologie de Compiègne, 60205 Compiegne cedex, France
3 UMR CNRS 7356, Université de La Rochelle, 17000 La Rochelle cedex, France
* Corresponding author: email@example.com
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: ε′f 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.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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