Methodology for Prediction of the Fatigue Life for Lug Joints Subjected to Combined In-Plane and Out-of-Plane Loading

Master thesis (2018)

Authors

R.C. Kuipers Aerospace Engineering

Contributors

R.C. Alderliesten (supervisor 1)
T Janssen (supervisor 1)
C.D. Rans (supervisor 2)
B. Y. Chen (supervisor 2)
Faculty
Aerospace Engineering
Copyright: © 2018 Rutger Kuipers
Fatigue Out-of-plane Lug In-plane
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Published Date

09-03-2018

Language

English

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Faculty

Aerospace Engineering

Abstract

New methods for aircraft movables introduce oblique- and out-of-plane loads on lug joints. With the introduction of these loads on lugs the need arises for a more detailed fatigue life prediction method.

Therefore, the thesis research focused on creating a methodology for predicting the fatigue life for lug joints subjected to combined in- and out-of-plane loading in co-operation with GKN Fokker Aerostructures. Current prediction methods are all based on axially loaded lugs. In concept, this method applies the Larsson relation.

From Finite Element Analyses (FEA) of different in- and out-of-plane loaded lugs, the influence of eccentricity, taper angle, load angle, and lateral loads on the Larsson relation became apparent. Resulting in the addition of correction factors Kecc, Kα,and KL in Larsson. Although the method is verified, experimental test have to be performed for validation. Recommended is the expansion of the out-of-plane FEA and the inclusion of transverse loaded lugs.