2 edition of Design of a cure monitoring system for composite aircraft repair patches. found in the catalog.
Design of a cure monitoring system for composite aircraft repair patches.
by Dept. of Aerospace Engineering, University of Toronto in [Toronto]
Written in English
Thesis (M.Sc.) -- University of Toronto, 1996.
|The Physical Object|
|Pagination||1 v. (in various foliations).|
Airbus fastens together composite panels to make the A fuselage, closer to the traditional structural design of a metal airplane and similarly replaceable in case of damage. Structural Health Monitoring Condition-Based Maintenance and Intelligent Structures. Editor: Fu-Kuo Chang, Department of Aeronautics and Astronautics, Stanford University. Proceedings of the Eighth International Workshop on Structural Health Monitoring, September ,
Modern Aircraft, Yachts, Cars, and Trains Early Aircraft Structures Modern Aircraft Structures and Other Applications Care of Composite Parts Sources of Damage to Composite Parts Physical or Chemical Damage Deterioration in Normal Service Avoidance of Damage and Reduction of Deterioration in Service. Cure monitoring using embedded sensors for composite repair applications; Process induced residual stresses in repair patches bonded using heating pads; Parasitic effects of embedded tubular sensors in laminated composites; Dr. Linda Kliment - Research interests include applied aerodynamics and flight mechanics. Current/recent research includes.
The repair patch is made by replacing each ply of the composite laminate that has been removed from the damage area. The size of the repair patch should fit exactly the area prepared for repair, except for a final cosmetic or sanding layer, which is often slightly larger to allow for sanding down to achieve a smooth and/or cosmetic surface. This paper presents a quick repair method for composite structures mainly developed for aircraft. Existing repair methods use uncured prepreg for repair patches and it takes a long time to form and cure the repair patches. The developed method uses pre-cured thin repair patches between which glue is .
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Monitoring of Composite Patch Repairs. Repair patches are widely used in the aircraft industry for small repairs of the aircraft fuselage in order to extend the operational life of aging aircrafts.
Lamb waves can be successfully used to detect disbonds of composite repair patches . Alan A. Baker, John Wang, in Aircraft Sustainment and Repair, Heating and Pressurisation. Heating and pressurisation are key installation issues since both have a direct impact on the quality of the repair.
Controlled heating is required to cure adhesives, and if required, cocure the composite patches to the aircraft structure.
However, application and cure of the repair patch and core plug — the demonstration case was the C radome — would remain a manual operation. Elsewhere, the German Aerospace Center (DLR, Stuttgart, Germany) is exploring automated composite repair as well, using a resin infusion-based system similar in many respects to the EADS IW system.
With this system, EADS used only hard patches precured in an autoclave, because cure temperature of a wet layup patch on the aircraft could not be adequately controlled. "With the Zimac HBS bonding system, we can cure wet layup patches on the airplane within the tolerances required and get a fully cured patch without bubbles or defects in the.
Composite patch repair is a recent method of repairing damaged aircraft structural components. The basic principle of the method is to adhesively bond a composite patch over the damaged area in. Structural Health Monitoring: Technology Basics. Most modern structural health monitoring (SHM) system designs rely on a damage tolerance philosophy, says Dr.
Dennis Roach, a Distinguished Member of the technical staff at Sandia National Laboratories (Albuquerque, N.M.), which means that a structure can withstand some damage without failing. For composite repairs to short cracks, it is accepted that the dominant effect of the patch is due to the reduction in the net section stress.
We have previously shown that for composite repairs to a 5 mm-long initial crack, i.e. Case 1 in Sectionand to cracks that have arisen and grown from small surface pits, there was a near linear relationship between the log of the crack length and.
In order to alleviate certification concerns, and thus facilitate the implementation of this repair technology to critical damage in primary structure, the "smart patch" approach has been proposed. This approach involves incorporating sensors into the composite patch to self-monitor patch health.
Dennis Roach, Kirk Rackow, in Aircraft Sustainment and Repair, Doubler Design Guidelines. Moving Technology into Routine Maintenance Programmes: Ref.
 describes airframe maintenance programmes from an airlines’ perspective. It describes sources of aircraft damage and how the damage is addressed through inspection and repair tasks.
Depending on the resin system used, the repair will require curing at elevated temperatures. These could be as low as 50–60 °C for some room temperature wet layup resins to °C for some prepreg systems.
Some special repair prepreg systems have been developed with lower cure ( °C) prepregs optimised for repair use such as Hexply. A real-time active smart patch system for monitoring the integrity of bonded repair on an aircraft structure 9 May | Smart Materials and Structures, Vol.
15, No. 3 Repair of damaged RC columns using fast curing FRP composites. The primary objective of aircraft repair is to restore damaged parts to their original condition. When repair of a damaged part is possible, first study the part carefully to fully understand its purpose or function.
Principal requirements in repair of structures, inspection of the damage and accurate estimate of the type of repair required, important steps in repairing structural damage. Design of Emergency Aircraft Repairs Using Composite Patches Article (PDF Available) in Mechanics of Composite Materials and Structures 8(3).
In addressing the aircraft system requirements, the normal tendency is to deal primarily with those elements of the aircraft system that relates directly to the aircraft performance for flying. At the same time, very little attention is given to periodic maintenance and aircraft health monitoring system until the system fails and needs.
However, companies making general aviation (GA) aircraft and Airbus were still prescribing step repairs, or alternately, upside-down “wedding cake” taper-scarf repair patches — i.e., the largest diameter ply at the bottom and smallest at the top, covered by a final layer that seals the repaired area.
This technique came from the marine. edition of ACComposite Aircraft Structure). The information in this AC is applicable to repairs and alterations of bonded and composite structures, whether it is a damaged part that can be removed from the airplane for repairs, or repairs and alterations on the aircraft itself.
Examples include repair patches, on-wing bonded repairs, and. Fromhe was a principal investigator of the USAF funded Composite Repair of Aircraft Structures (CRAS) program. Under that program, he had developed and implemented analytical and computational methods for design and analysis of bonded repairs over metallic aircraft structures.
CompositesWorld supplier directory. Fabrics/Preforms 1/14/ The markets: Industrial applications () A number of manufacturers in the composites industry have relatively quietly carved out a lucrative and growing share in the market for brackets, fixtures, ductwork, pallets, and other often hidden and typically less newsworthy parts that nevertheless require complex shapes, must perform.
The main goal is design, verification, monitoring and certification process of fatigue crack repairs of the selected critical places on the Czech light combat jet LA.
The repairs were carried out using carbon/epoxy composite straps and patches and cold-setting glue SW A new type of repair was developed and tested.
Take a typical hand lay-up for making composites one step further with vacuum bagging. Once layers of reinforcement and resin are laid-up by hand, the laminate is sealed in an air-tight environment, like a vacuum bag, and connected to a vacuum source.
Vacuum is applied, creating mechanical pressure on the laminate throughout the cure cycle. The repair of composite aircraft structures is similar to that of other advanced composite repair techniques.
These principles will be covered briefly with emphasis and examples on applications in light General Aviation composite aircraft. This type of aircraft structure repair differs from other composite repairs in that skin thicknesses are.Consideration of aircraft operations, including inspection, maintenance, and repair procedures is crucial in the development and application of new materials and structures.
This part of the committee's report focuses on the operation and monitoring of materials and structures in a service. The information in this AC is applicable to repairs and alterations of bonded and composite structures, whether it is a damaged part that can be removed from the airplane for repairs, or repairs and alterations on the aircraft itself.
Examples include repair patches, on-wing bonded repairs, and fabrication and bonding of replacement parts.