Fatigue Analysis of Wing-Fuselage Lug section of a Transport Aircraft

Shridhar, K and Suresha, BS and Mohan Kumar, M (2019) Fatigue Analysis of Wing-Fuselage Lug section of a Transport Aircraft. In: 2nd International Conference on Structural Integrity and Exhibition 2018.

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Lug joints are special type of pin joints, which are widely used for joining various parts of an aircraft, especially for joining wings to fuselage. During service, the lug type joints are subjected to fatigue loading and complete load transfer takes place through the pin. At the pin and lug interface, the combination of high stress concentration and fretting could potentially lead to crack initiation and then crack propagation under cyclic loading. Because of this reason the wing-fuselage lug joints are considered as most fracture critical components in the aircraft structure. To appraise the safety level of lugs under working conditions, fatigue crack growth and residual life data are required.In the present work, a computational model for estimating the residual fatigue life of attachment lugs has been proposed. The pin is assumed to have a larger stiffness than the lug. The pin is assumed to be fit in the lughole with zero clearance and no frictional restraint. Initially stress concentration effects in the loaded lug were determined by applying analytical and numerical methods. Stress intensity factor for the pin loaded lug with through-the-thickness emanating from the lug hole has been determined. Both analytical and numerical methods have been used for obtaining the stress intensity factor. Further, fatigue crack growth life for the cracked lug subjected to constant amplitude cyclic loading was estimated using the Walker’s crack growth model. Also the effect of different radius ratios (lug geometry) on the number of cycles to failure is studied. For the FE analysis MSC Nastran/Patran softwares have been used.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Lug joint, Fatigue crack growth life, MSC Patran/Nastran
Subjects: AERONAUTICS > Air Transportation and Safety
ENGINEERING > Mechanical Engineering
ENGINEERING > Structural Mechanics
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 07 Jun 2022 09:41
Last Modified: 07 Jun 2022 09:41
URI: http://nal-ir.nal.res.in/id/eprint/13591

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