Pillowing on the damage tolerance of fuselage joints, a through crack was introduced into the top rivet row of the simple lap joint shown in fig 1. Inspection of other similar aircraft revealed disbonding, corrosion and cracking problems in the lap joints corrosion processes and the subsequent build-up of voluminous corrosion products inside the lap joints lead to so-called pillowing, whereby the faying surfaces are separated. D sight images of fuselage lap joints have shown that only a small amount of pillowing occurs at the free edges compared to the area between the rivets d sight is an enhanced visual inspection technique that is very sensitive to out-of-plane displacements (komorowski et al, 1996. International journal of aerospace engineering is a peer-reviewed, open access journal that aims to serve the international aerospace engineering community through dissemination of scientific knowledge on practical engineering and design methodologies pertaining to aircraft and space vehicles.
Journal of aircraft vol 44, no 3, may-june 2007 corrosion pillowing in aircraft fuselage lap joints nicholas c bellinger,∗ jerzy p komorowski,† and ronald w gould‡ national research council canada, institute for aerospace research, ottawa, ontario k1a 0r6, canada doi: 102514/118589 this paper presents the results of studies that. International conference on damage tolerance of aircraft structures, delft university of technology, delft, the netherlands 2 nesterenko b, nesterenko g (2011) analysis of requirements on fatigue and damage tolerance for civil transport airplanes. Corrosion in aircraft fuselage lap joints however, two noise sources in the form of probe lift-off and interlayer gap can cause false indications or inaccuracies in. Title: quantifying corrosion in fuselage lap joints objective: (1) to show examples of the type of damage that can be present in corroded 2024-t3 lap joints and (2) to illustrate the process for determining the equivalent initial flaw sizes for corroded fuselage lap joints.
Simulated fuselage lap joint coupons exposed to the corrosive environments where aircraft are commonly stationed finally, the critical corrosion damage condition must be known so airframe.
Abstract this 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. Corrosion pillowing in aircraft fuselage lap joints journal of aircraft vol 44, no 3, may-june 2007 corrosion pillowing in aircraft fuselage lap joints nicholas c bellinger,∗ jerzy p komorowski,† and ronald w gould‡ national research council canada, institute for aerospace research, ottawa, ontario k1a 0r6, canada doi: 102514/118589 this paper presents the results of studies. This effect is recognized by the aircraft industry when considering test results for relatively small, simple, lap joint specimens and properties of the real fuselage structures the discrepancies can be partly associated with the influence of the stiffening elements' geometry on the pillowing and bending of the fuselage skin and with the.
The fuselage splice joints of transport aircraft are subject to corrosion and fatigue in normal operation as military and commercial fleets are flown beyond their original design goals, these may become safety and economic limitations on operation. Significantly, the corrosion corrosion damage at the faying surfaces of joints can also cause pillowing or bulging of the sheets between rivets. The results show that corrosion pillowing can significantly increase the stress in a lap joint for material loss below the detection limit of current nondestructive inspection techniques, thus increasing the risk of premature cracking.
Types of corrosion normally found on aircraft include: uniform surface attack this is the most common type and is caused simply by exposing the metal to oxygen in the air, such as when paint is worn off wing skin or the fuselage. Corrosion was visibly concentrated internally along the upper side of the lap splice/stiffener connection (rh side in fig 4), but d sight showed corrosion-induced 'pillowing' to be present throughout the lap splice: corrosion-induced pillowing is bulging of the lap splice between the rivet positions, and is caused by local build-ups of. Corrosion pillowing in aircraft fuselage lap joints harvard case study solution and analysis of harvard business case studies solutions - assignment helpin most courses studied at harvard business schools, students are provided with a case study.