ABD Matrix Composite Categories and Articles

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The Composite Overwrap Option for Pipework Repair
Viewed 421 times since Fri, May 25, 2012
This paper provides a description of work carried out by an industry forum concerned with the development of documentation for the repair of pipework and pipeline systems using composite materials. The membership of the group includes both users and... Read More
TCO F Module – Describe Composite Laminate Fabrication and Bonded Repair Methods
Viewed 295 times since Sat, Aug 20, 2011
The simplistic view of structural composite fabrication is that fiber reinforced plastic composite components are fabricated from "wet” material, in many cases epoxy prepreg materials, and made into their finished hard form using heat and... Read More
Self-healing: a new paradigm in materials design
Viewed 358 times since Sun, Aug 21, 2011
Self-healing materials, when damaged, are designed to sense the failure and respond in an autonomous fashion to restore structural function. Inspired by biological systems, synthetic self-healing materials represent a new paradigm in the... Read More
Results From FAA Program to Validate Bonded Composite Doublers for Commercial Aviation Use
Viewed 256 times since Mon, Dec 10, 2012
The number of commercial airframes exceeding twenty years of service continues to grow. In addition, Service Life Extension Programs are attempting to extend the "economic" service life of commercial airframes to thirty years. The use of bonded... Read More
Viewed 281 times since Thu, Dec 6, 2012
Maintaining the airworthiness of in-service aircraft and at the same time keeping the maintenance cost low is of prime concern to the operators and regulatory authorities. In order to keep maintenance cost low, right decisions need to be made... Read More
Viewed 224 times since Thu, Dec 6, 2012
There is a wide variation in the composition and structural application of laminates, and it is essential that these factors be given major consideration when any restoration activities are undertaken. To a similar extent, there also exist many types... Read More
Repair of Fatigued Steel Bridge Girders with Carbon Fiber Strips
Viewed 231 times since Thu, Dec 6, 2012
This report investigates a method of repairing fatigued steel bridge girders using carbon fiber reinforced polymer (CFRP) strips. This type of repair would be used to prevent the propagation of cracks which could lead to failure of the bridge girders... Read More
Repair of Composite Laminates-I: Test Results
Viewed 297 times since Wed, Dec 5, 2012
Tests were conducted with the objective of evaluating the eff ectiveness of techniques used for repairing damaged ber reinforced laminated composites. E ffectiveness of the repair was assessed by the tensile strength of the repaired laminate. In the... Read More
Repair in Single-Skin Construction
Viewed 394 times since Sat, Feb 11, 2012
Failures in FRP constructed vessels fall into one of two categories. First, the failure can be the result of a collision or other extreme force. Secondly, the failure may have occurred because of design inadequacies. In the case of the latter, the... Read More
Viewed 318 times since Wed, Dec 19, 2012
Major structural repairs are those that affect the safe operation of an aircraft and it is important to do it right Major repairs include repairs to large holes in the wing skin , damaged spars or webs, or damaged attachments. It would be nice to... Read More
Guidelines for the Development of a Critical Composite Maintenance and Repair Issues Awareness Course
Viewed 257 times since Wed, Jan 30, 2013
The framework for the awareness course is defined by Terminal Course Objectives, which are summarized further into terminal course modules. The four main areas at the highest outline level include base knowledge, teamwork and disposition, damage... Read More
Environmental Durability Trial of Bonded Composite Repairs to Metallic Aircraft Structure
Viewed 291 times since Sun, Mar 18, 2012
An agreement between DSTO and the US Air Force Research Laboratory (AFRL) was established as a part of a larger Aging Aircraft Project Agreement (PA). As a part of this agreement a large experimental program was organised to examine the long-term... Read More
Effect of Load-Bypass on Structural Efficiencies of Bonded and Bolted Repairs
Viewed 325 times since Wed, Jan 25, 2012
Low-stiffness scarf inserts within adhesively bonded scarf repairs and bolted doublers within mechanically fastened repairs transfer less load than that originally supported by the damaged area of the structure. In this work we present an improved... Read More
Development of Bonded Composite Doublers for the Repair of Oil Recovery Equipment
Viewed 299 times since Thu, Jan 5, 2012
An unavoidable by-product of a metallic structure’s use is the appearance of crack and corrosion flaws. Economic barriers to the replacement of these structures have created an aging infrastructure and placed even greater demands on efficient... Read More
Development of a Hard-Patch Approach for Scarf Repair of Composite Structure
Viewed 372 times since Wed, Jan 4, 2012
The pre-moulded (hard) patch approach for scarf repair of composite structures has several advantages compared with the conventional prepreg lay-up (soft-patch) approach, which involves forming the patch directly in the repair cavity. These include... Read More
Development and Validation of Nondestructive Inspection Techniques for Composite Doubler Repairs on Commercial Aircraft
Viewed 348 times since Wed, Dec 28, 2011
Composite doublers, or repair patches, provide an innovative repair technique which can enhance the way aircraft are maintained. Instead of riveting multiple steel or aluminum plates to facilitate an aircraft repair, it is possible to bond a single... Read More
Design Methodology for Scarf Repairs to Composite Structures
Viewed 404 times since Fri, Dec 23, 2011
Scarf repairs are the preferred method of repairing thick composite structures, especially when externally bonded patches can no longer meet the stiffness, strength, and flushness requirements. Present designs of scarf repairs are based on two... Read More
Viewed 296 times since Sat, Nov 26, 2011
The efficiency of three composite reinforcements in retarding the crack growth of center-cracked 1.6 mm thick 2024-T3 aluminum plates has been tested. The effects of stop drilling, residual thermal stresses, and structural support of... Read More
Bonded Repair Technology for Aging Aircraft
Viewed 326 times since Fri, Oct 21, 2011
NATO weapons systems are being extended well beyond their design lives due to decreases in defence budgets and the rising costs associated with procuring new hardware. This situation makes it increasingly important that methods for... Read More
Bonded Repair of Aircraft Composite Sandwich Structures
Viewed 434 times since Thu, Oct 13, 2011
With the increasing use of fiber-reinforced composite sandwich structures in aircraft components, it has become necessary to develop repair methods that will restore the component’s original design strength without compromising its structural... Read More