Corrosion pillowing in aircraft fuselage lap joints

  1. Get@NRC: Corrosion pillowing in aircraft fuselage lap joints (Opens in a new window)
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Proceedings titleJournal of Aircraft
Conference46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 13th AIAA/ ASME/AHS Adaptive Structures Conference, 7th AIAA Non-Deterministic Approaches Forum, 6th AIAA Gossamer Spacecraft Forum, and 1st AIAA Multidisciplinary Design Optimization Specialist Conference, April 18-21, 2005, Austin, Texas
Pages758763; # of pages: 6
SubjectCorrosion pillowing; Fracture surfaces; Lap joints; Semi-elliptical cracks; Aircraft; Computer simulation; Corrosion resistance; Cracks; Finite element method; Fracture; Stress analysis; Fuselages
AbstractThis paper presents the results of studies that have been carried out at the National Research Council on the effect that corrosion pillowing has on the structural integrity of fuselage lap joints. Modeling of corrosion pillowing using finite element techniques showed that the stress near the rivet holes increased to the yield strength of the material (Al 2024-T3) when the corrosion present was above 6% thickness loss. In addition, the analysis showed that pillowing resulted in a stress gradient through the skin thickness, which suggested that semi-elliptical cracks with a high aspect ratio could form. During teardowns of service-exposed lap joints, these types of cracks were found to occur at numerous holes and a closer examination of some of the fracture surfaces revealed the presence of fatigue striations. Therefore a new source of multi-site damage other than fatigue was identified.
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AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedYes
NPARC number21275955
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Record identifier721bd37e-9324-476a-b481-b4b4485d6c0f
Record created2015-08-21
Record modified2016-05-09
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