Application of the strain-based FAD to failure assessment of surface cracked components
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 7 December 2015
Abstract
Purpose
The purpose of this paper is to validate the strain-based failure assessment diagram (SB-FAD) approach for surface cracks in components subjected to displacement controlled boundary conditions.
Design/methodology/approach
Numerical analyses are performed for several crack geometries and materials representative for aerospace applications. The performance of the SB-FAD is judged by comparing numerically calculated J-integrals to respective analytical estimates, using both Options 1 and 2 approximations.
Findings
In the most cases, both Options 1 and 2 SB-FAD method results in reasonably conservative J-estimates. Exceptions are for surface cracks in a pressurized vessel made of a material with low-strain hardening, for which Option 2 assessment produces non-conservative results. In contrast, Option 1 assessment is conservative for all geometries considered. In general, Option 1 results in a considerable overestimation of the crack driving force, whereas Option 2 produces rather accurate results in many cases.
Originality/value
The results demonstrate both the potential of the SB-FAD method and needs for its further improvements.
Keywords
Acknowledgements
This study was performed within the ESA Technology and Research Programme “Structural Integrity of Pressurized Structures – Advanced Non-Linear Methodology”, ESA 4000101199/10/NL/SFe.
Citation
Varfolomeev, I., Windisch, M. and Sinnema, G. (2015), "Application of the strain-based FAD to failure assessment of surface cracked components", International Journal of Structural Integrity, Vol. 6 No. 6, pp. 689-703. https://doi.org/10.1108/IJSI-01-2015-0002
Publisher
:Emerald Group Publishing Limited
Copyright © 2015, Emerald Group Publishing Limited