Authors: Boljanović, Slobodanka 
Maksimović, Stevan
Title: Fatigue crack growth modeling of attachment lugs
Journal: International Journal of Fatigue
Volume: 58
First page: 66
Last page: 74
Issue Date: 1-Jan-2014
Rank: M21a
ISSN: 0142-1123
DOI: 10.1016/j.ijfatigue.2013.03.016
In the present paper, computational procedures for the strength analysis of two cracked lug configurations are proposed. The authors consider the lug with single through-the-thickness crack as well as with single quarter-elliptical corner crack. The stress analysis and the fatigue life evaluations are tackled for both configurations. Numerical approaches based on quarter-point (Q-P) singular finite elements are developed for stress intensity factor calculations. Furthermore, the finite element analysis is applied in order to evaluate the polynomial expression for the stress intensity factor calculation of the lug with one through-the-thickness crack. The residual life estimation of cracked lugs is analyzed by employing the crack growth law based on a two-parameter driving force model. Moreover, the crack growth path for the lug with quarter-elliptical crack is simulated. The reliability of the proposed procedures is verified using experimental fatigue crack growth data. Fatigue life calculations and crack path simulations show a very good agreement with experimental observations.
Keywords: Attachment lugs | Crack path | Fatigue crack growth | Life estimation | Surface flaws
Publisher: Elsevier
Project: Dynamics of hybrid systems with complex structures. Mechanics of materials. 

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