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Advances in Materials Science and Engineering
Volume 2017, Article ID 3014172, 13 pages
Research Article

An Analytical Model for the Identification of the Threshold of Stress Intensity Factor Range for Crack Growth

1School of Engineering and Technology, University of Hertfordshire, College Lane Campus, Hatfield AL10 9AB, UK
2Department of Industrial Engineering, University of Naples Federico II, 80125 Naples, Italy
3School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK

Correspondence should be addressed to Marzio Grasso;

Received 22 July 2016; Revised 30 September 2016; Accepted 18 October 2016; Published 18 January 2017

Academic Editor: Ming-Xing Zhang

Copyright © 2017 Marzio Grasso 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.


The value of the stress intensity factor (SIF) range threshold for fatigue crack growth (FCG) depends highly on its experimental identification. The identification and application of are not well established as its determination depends on various factors including experimental, numerical, or analytical techniques used. A new analytical model which can fit the raw FCG experimental data is proposed. The analytical model proposed is suitable to fit with high accuracy the experimental data and is capable of estimating the threshold SIF range. The comparison between the threshold SIF range identified with the model proposed and those found in the literature is also discussed. identified is found to be quite accurate and consistent when compared to the literature with a maximum deviation of 5.61%. The accuracy with which the analytical model is able to fit the raw data is also briefly discussed.