Search Results

This document provides recommendations concerning the minimum knowledge and analytical skill guidelines for a composite and metal bond repair design engineer. Teaching levels have been assigned to this curriculum to define the knowledge, skills and abilities needed to design appropriate repairs.

Module 1 is the Composite Awareness curriculum, independent of the application. Module 2 is the Initial Inspection and Damage Mapping curriculum. ...The combination of the modules represents the applicable identification and assessment process for damage to composite aircraft structures (see Figure 1). Module 1 is prerequisite for attendance to the other modules. ...The contents of Module 1 may also be used for composite awareness training of a broader target audience, including line mechanics.

Design and fabrication of a titanium matrix composite (TMC) F-15 nose landing gear (NLG) outer cylinder is discussed. Results of a field experience survey examining landing gear (LG) operations are also discussed.

A high potential to reach this goals is offered by textile structural composites. Textile fibre performs for composite reinforcement can be manufactured automatically with an optimized fibre architecture in 3D space. ...Composite materials offer a high potential for realizing high performance light weight structures for aerospace applications. ...In the paper the overall performance of textile structural composites based on braiding will be evaluated and first exemplary applications, especially in the aerospace field will be presented (stiffened profiles, engine components).

The use of composite materials with high thermal conductivities is increasingly widespread in space flight applications. ...Some limitations are inherent in the composite materials themselves, like thermal conductivity and radiation shielding, and some are imposed by external design rules, like electro-magnetic interference (EMI) shielding and grounding. ...This paper reviews the work done at the Johns Hopkins University / Applied Physics Laboratory (JHU/APL) to quantify the thermal characteristics of high conductivity fiber/polymer matrix composites, to identify the other design constraints that limit their use, and the ongoing effort to reduce those limitations.

Unmanned Aerial Vehicles (UAVs) provide the ability to perform a variety of experimental tests of systems and unproven research technologies, including new autopilot systems and obstacle avoidance capabilities, without risking the lives of human pilots. This paper describes the activities of design, optimization, and flight operations of a UAV conceived at Clarkson University (USA) and equipped to perform wind speed measurements to support wind farmsite planning. The UAV design has been assisted and validated by the use of an automatic virtual environment for the assisted design of civil UAVs. This tool can be used as a “computing machine” for civil UAVs. The operator inputs the mission profile and other generic parameters and data about performance, aerodynamics, and weight breakdown are extracted. A mathematical model of the UAV for flight simulation and its dynamic computations, along with automatic drawing is also produced.

(CTAS) in the development of composite patch repair techniques through an internally funded research and development program (IRAD) prior to the award of the C141-B Drop-In-Repair (DIR) Contract and subsequently in supporting the various activities of fulfilling the contractual requirements after the contract award, for Warner-Robins Air Logistics Center (WRALC) during August 1993 through October 1994. ...WRALC had decided to repair most of the weep holes (limited to a maximum of fifteen holes per wing), using Boron/epoxy composite patch doublers, as a near-term remedial measure, in lieu of full wing plank replacement. ...Although the overall C141-B DIR Program involved other repair and maintenance work, CTAS was able to respond to the challenges of the program on short notice, due to the groundwork laid with the composite patch repair technology through the IRAD Program. Also, this paper describes the quality assessment of the manufactured and the installed Boron/epoxy patches through the non-destructive inspection (NDI) data acquired for the patches before and after installation on the aircraft.

Before new technologies can be applied within the aviation industry, they have to be carefully tested according to international standards and approved by the OEM’s. To implement the new alternative SLCR-Laser coating removal process into the A/C maintenance centers, it was tested in a comprehensive testing program based on the SAE MA4872 guidelines and additional requirements given by Airbus and Boeing. This program was performed by Lufthansa Technik AG, Hamburg and SLCR Lasertechnik GmbH, Düren in close collaboration with EADS Airbus and the Boeing Corp. The paper depicts the results gained during the tests conducted according to the SAE document and it presents some lay-outs of respective systems.

Persons who successfully complete the requirements of this certification standard are considered to be able to perform basic composite repairs to composite structures in compliance with the manufacturers’ repair documentation or other acceptable repair methods. ...It is recognized that the structural integrity of repaired composite structures depends upon the capabilities of the individuals who are responsible for performing the repairs. ...This document is intended to address repairs of composite structure regardless of the type of structure such as marine, wind turbine, automotive, aircraft, or other applications.

Composite materials have time and again proven to be highly useful, especially in the aerospace industry with the increasing need for light-weight materials albeit with high stiffness to strength ratios. ...The Ceramic Particle Reinforced Composites can be effectively utilized in tuning the natural frequencies of components by varying the volume fractions up to 40% with the help of Representative Volume Element (RVE) / Unit Cell Models as explained in Reference [1]. ...The studies will be performed using the commercial FE software (Ansys Workbench) by homogenizing the effective material properties and this will involve a direct comparison of natural frequencies and mode shapes with the existing metallic v. proposed composite material models.

This document provides recommendations concerning the minimum knowledge and skill guidelines for a composite and metal bond repair inspector. Teaching levels have been assigned to this curriculum to define the knowledge, skills and abilities needed to inspect repairs.

Persons who successfully complete the requirements of this certification standard are considered to be able to perform basic composite repairs to composite structures in compliance with the manufacturers’ repair documentation or other acceptable repair methods. ...It is recognized that the structural integrity of repaired composite structures depends upon the capabilities of the individuals who are responsible for performing the repairs. ...This document is intended to address repairs of composite structure regardless of the type of structure such as marine, wind turbine, automotive, aircraft, or other applications.

This document provides recommendations concerning the minimum knowledge and skill guidelines for a composite and metal bond repair inspector. Teaching levels have been assigned to this curriculum to define the knowledge, skills and abilities needed to inspect repairs.

This is a general curriculum that has been developed to identify the minimum knowledge and skill requirements of a composite and metal bond repair technician/specialist. Teaching levels have been assigned to the curriculum to define the knowledge, skills and abilities graduates will need to make safe, effective repairs.

A worldwide reference for repair technicians and design engineers, the book is an outgrowth of the course syllabus that was developed by the Training Task Group of SAE's Commercial Aircraft Composite Repair Committee (CACRC) and published as SAE AIR 4938, Composite and Bonded Structure Technician Specialist Training Document. ...This second edition has been extensively updated to keep pace with the growing use of composite materials in commercial aviation. A worldwide reference for repair technicians and design engineers, the book is an outgrowth of the course syllabus that was developed by the Training Task Group of SAE's Commercial Aircraft Composite Repair Committee (CACRC) and published as SAE AIR 4938, Composite and Bonded Structure Technician Specialist Training Document. ...Topics new to this edition include: Nondestructive Inspection (NDI) Methods Fasteners for Composite Materials A Method for the Surface Preparation of Metals Prior to Adhesive Bonding Repair Design Although this book has been written primarily for use in aircraft repair other applications including marine and automotive are also covered.

The approach is to build tooling from a polymer/graphite composite which will correlate with the thermal expansions of the composite being molded. Detailed information is shared on the development of master models, intermediary models and other sequential tooling steps. ...Assuming that large high temperature resistant composites will primarily be cured in autoclaves, an immediate requirement for suitable autoclave tooling exists. ...Finally, the paper shares the molding results with advanced thermoplastic composites.

The material characteristics of composites, their applications, and complex composites manufacturing processes depend on many factors. ...This essential information captures the state of the composites industry to assist engineering/technical professionals in charting a course for achieving economic success. ...., commercial/military aerospace, wind energy, automotive, and bicycle industries) address fundamental topics and explore the affordability of composites from raw material to end-of life-disposal costs with skilled perspectives that include: • Material characteristics and economics of composite structure • Complex manufacturing and specifics of assembly methods • Applications for composites • Product and human health • Safety and environmental impacts The authors provide strong basic economics concepts that are directly applied to the composites industry.

This document identifies the basic elements and provides a standard for structuring operator self-verification programs within the aviation, space, and defense industry for producers of commercial and military aircraft and weapons platforms, space vehicles, and all related hardware, software, electronics, engines, and composite components. The requirements specified in this standard are complementary (not alternative) to contractual and applicable statutory and regulatory requirements.

System costs and weight savings are presented as a function of percent utilization of composite materials from zero to 80%. The weight savings potential of composites for direct material substitution and for resized aircraft show gains of up to 25 and 50%, respectively. ...This paper describes the results of parametric design studies of the application of filamentary composite materials in the structure of high-subsonic-speed transport aircraft. System costs and weight savings are presented as a function of percent utilization of composite materials from zero to 80%.

This document describes a life cycle cost model for commercial aircraft composite structure. The term life cycle cost used herein, refers to the airline costs for maintenance, spares support, fuel, repair material and labor associated with composites after introduction into service and throughout its useful life. ...The term life cycle cost used herein, refers to the airline costs for maintenance, spares support, fuel, repair material and labor associated with composites after introduction into service and throughout its useful life. This document contains the equations that can be programmed into software which is used to estimate the total cost of ownership aircraft, including structure.