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International Journal of Aerospace Engineering
Volume 2018, Article ID 4048386, 13 pages
Research Article

Application of a Cohesive Zone Model for Simulating Fatigue Crack Growth from Moderate to High Levels of Inconel 718

1School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an, China
2State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, China
3School of Aerospace Engineering, Tsinghua University, Beijing, China

Correspondence should be addressed to Huan Li; nc.ude.upwn@nauhil

Received 8 September 2017; Accepted 6 December 2017; Published 1 February 2018

Academic Editor: Roberto G. Citarella

Copyright © 2018 Huan Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A cyclic cohesive zone model is applied to characterize the fatigue crack growth behavior of a IN718 superalloy which is frequently used in aerospace components. In order to improve the limitation of fracture mechanics-based models, besides the predictions of the moderate fatigue crack growth rates at the Paris’ regime and the high fatigue crack growth rates at the high stress intensity factor levels, the present work is also aimed at simulating the material damage uniformly and examining the influence of the cohesive model parameters on fatigue crack growth systematically. The gradual loss of the stress-bearing ability of the material is considered through the degradation of a novel cohesive envelope. The experimental data of cracked specimens are used to validate the simulation result. Based on the reasonable estimation for the model parameters, the fatigue crack growth from moderate to high levels can be reproduced under the small-scale yielding condition, which is in fair agreement with the experimental results.