Development of Structural Integrity Analysis Technologies for Aging Aircraft Structures: Bonded Composite Patch Repair and Weight Function Methods PDF Download
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Languages : en
Pages : 0
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Book Description
The purpose of this research was to develop advanced structural integrity analysis methods for aging aircraft structures. The primary focus of this study was to develop a method for performing fatigue crack growth analyses under a composite (repair patch) on a metallic structure. Also, it was envisioned that these methods would be incorporated into the fatigue crack growth software, AFGROW, so that this promising technology can be transitioned to U.S. Air Force Logistic Centers, U.S. Air Force contractors and other government agencies as quickly as possible. Fatigue cracks growing from fastener holes, or multiple fastener holes, also are common problems found in aging aircraft. To address these problems, analytical methods (weight functions) were developed to assist engineers in the analysis of fatigue cracks growing in arbitrary stress fields, commonly found around cold-worked fastener holes and stop-drilled cracks. Furthermore, an approach to evaluate multiple cracking, or multiple-site damage (MSD), was developed as a future enhancement to the AFGROW program.
Author:
Publisher:
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Category :
Languages : en
Pages : 0
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Book Description
The purpose of this research was to develop advanced structural integrity analysis methods for aging aircraft structures. The primary focus of this study was to develop a method for performing fatigue crack growth analyses under a composite (repair patch) on a metallic structure. Also, it was envisioned that these methods would be incorporated into the fatigue crack growth software, AFGROW, so that this promising technology can be transitioned to U.S. Air Force Logistic Centers, U.S. Air Force contractors and other government agencies as quickly as possible. Fatigue cracks growing from fastener holes, or multiple fastener holes, also are common problems found in aging aircraft. To address these problems, analytical methods (weight functions) were developed to assist engineers in the analysis of fatigue cracks growing in arbitrary stress fields, commonly found around cold-worked fastener holes and stop-drilled cracks. Furthermore, an approach to evaluate multiple cracking, or multiple-site damage (MSD), was developed as a future enhancement to the AFGROW program.
Author: Rikard Benton Heslehurst
Publisher: CRC Press
ISBN: 0429583850
Category : Technology & Engineering
Languages : en
Pages : 218
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Book Description
Engineered Repairs of Composite Structures provides a detailed discussion, analysis, and procedures for effective and efficient repair design of advanced composite structures. It discusses the identification of damage types and the effect on structural integrity in composite structures, leading to the design of a repair scheme that focusses on the restoration of the structural integrity and damage tolerance. This book teaches the reader to better understand effective and efficient repair design, allowing for more structurally effective repairs of damaged composite structures. It also discusses the application of the repair and what is needed in the forming of the composite repair to meet the engineering design requirements. Aimed at materials engineers, mechanical engineers, aerospace engineers, and civil engineers, this practical work is a must have for any industry professional working with composite structures.
Author: A.A. Baker
Publisher: Elsevier
ISBN: 0080522955
Category : Technology & Engineering
Languages : en
Pages : 561
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Book Description
The availability of efficient and cost-effective technologies to repair or extend the life of aging military airframes is becoming a critical requirement in most countries around the world, as new aircraft becoming prohibitively expensive and defence budgets shrink. To a lesser extent a similar situation is arising with civil aircraft, with falling revenues and the high cost of replacement aircraft. This book looks at repair/reinforcement technology, which is based on the use of adhesively bonded fibre composite patches or doublers and can provide cost-effective life extension in many situations. From the scientific and engineering viewpoint, whilst simple in concept, this technology can be quite challenging particularly when used to repair primary structure. This is due to it being based on interrelated inputs from the fields of aircraft design, solid mechanics, fibre composites, structural adhesive bonding, fracture mechanics and metal fatigue. The technologies of non-destructive inspection (NDI) and, more recently smart materials, are also included. Operational issues are equally critical, including airworthiness certification, application technology (including health and safety issues), and training. Including contributions from leading experts in Canada, UK, USA and Australia, this book discusses most of these issues and the latest developments. Most importantly, it contains real histories of application of this technology to both military and civil aircraft.
Author: Satya N. Atluri
Publisher: Springer Science & Business Media
ISBN: 3642843646
Category : Technology & Engineering
Languages : en
Pages : 492
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Book Description
The emergence of civil aviation as a means of mass transportation is primarily due to the large scale construction of jet airplanes in the past 30 years or so. A large number of these jet airplanes is currently operating at or beyond their designed fatigue lives. Thus, the structural integrity of these aging airplanes has become an issue of major concern to all nations of the world. To bring the needed technical and research focus on the issues involved in the life-enhancement and safety-assurance of aging airplanes, the Federal Aviation Administration sponsored a symposium in Atlanta, GA, USA, during 20-22 March 1990. This symposium, under the title "International Symposium on Structural Integrity of Aging Airplanes· was organized jointly be the Georgia Institute of Technology (Center for Computational Mechanics) and the Transportation Systems Center (Cambridge, MA) of the U.S. Department of Transportation. Industrial and academic experts from several countries in North America, Europe and Asia, were invited to discuss their experiences and proposed solutions. This monograph contains the original papers that represent the expanded and edited versions of the talks presented at this symposium. This book aims to bring the collective experience, from across the world, with problems related to the structural integrity of aging airplanes to the attention of the professional and research community at large - in the hope that it may stimulate further fruitful research on this important topic of global concern.
Author: A. Baker
Publisher: Springer Science & Business Media
ISBN: 9400927525
Category : Technology & Engineering
Languages : en
Pages : 224
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Book Description
The conventional approach to through-life-support for aircraft structures can be divided into the following phases: (i) detection of defects, (ii) diagnosis of their nature and significance, (iii) forecasting future behaviour-prognosis, and (iv) pre scription and implementation of remedial measures including repairs. Considerable scientific effort has been devoted to developing the science and technology base for the first three phases. Of particular note is the development of fracture mechanics as a major analytical tool for metals, for predicting residual strength in the presence of cracks ( damage tolerance) and rate of crack propagation under service loading. Intensive effort is currently being devoted to developing similar approaches for fibre composite structures, particularly to assess damage tolerance and durability in the presence of delamination damage. Until recently there has been no major attempt to develop a science and tech nology base for the last phase, particularly with respect to the development of repairs. Approaches are required which will allow assessment of the type and magnitude of defects amenable to repair and the influence of the repair on the stress intensity factor (or some related parameter). Approaches are also required for the development and design of optimum repairs and for assessment of their durability.
Author: Antoni Niepokolczycki
Publisher: Springer
ISBN: 3030215032
Category : Technology & Engineering
Languages : en
Pages : 1164
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Book Description
This book gathers papers presented at the 36th conference and 30th Symposium of the International Committee on Aeronautical Fatigue and Structural integrity. Focusing on the main theme of “Structural Integrity in the Age of Additive Manufacturing”, the chapters cover different aspects concerning research, developments and challenges in this field, offering a timely reference guide to designers, regulators, manufacturer, and both researchers and professionals of the broad aerospace community.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 694
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Book Description
Author: Rhys Jones
Publisher: Butterworth-Heinemann
ISBN: 008100544X
Category : Technology & Engineering
Languages : en
Pages : 972
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Book Description
Aircraft Sustainment and Repair is a one-stop-shop for practitioners and researchers in the field of aircraft sustainment, adhesively bonded aircraft joints, bonded composites repairs, and the application of cold spray to military and civil aircraft. Outlining the state-of-the-art in aircraft sustainment, this book covers the use of quantitative fractography to determine the in-service crack length versus flight hours curve, the effect of intergranular cracking on structural integrity and the structural significance of corrosion. The book additionally illustrates the potential of composite repairs and SPD applications to metallic airframes. Covers corrosion damage assessment and management in aircraft structures Includes a key chapter on U.S. developments in the emerging field of supersonic particle deposition (SPD) Shows how to design and assess the potential benefits of both bonded composite repairs and SPD repairs to metallic aircraft structures to meet the damage tolerance requirements inherent in FAA ac 20-107b and the U.S. Joint Services
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 169
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Book Description
This project emphasizes the development and evaluation of analytic methods for the solution of fracture mechanics problems as related to aircraft structures. Some of these methods are: finite and boundary element methods, singular/hybrid finite elements, alternating method, and path independent and domain independent integrals. When these methods are applied to various cases of aircraft structural problems, predictions of crack growth and fatigue life can be made. The final report describes these analytical methods as applied to various cases of aircraft structural problems, including the evaluation of composite patch repairs to existing cracks.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722924737
Category :
Languages : en
Pages : 154
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Book Description
Under the NASA-sponsored contracts for Advanced Technology Composite Aircraft Structures (ATCAS) and Materials Development Omnibus Contract (MDOC), Boeing is studying the technologies associated with the application of composite materials to commercial transport fuselage structure. Included in the study is the incorporation of maintainability and repairability requirements of composite primary structure into the design. This contractor report describes activities performed to address maintenance issues in composite fuselage applications. A key aspect of the study was the development of a maintenance philosophy which included consideration of maintenance issues early in the design cycle, multiple repair options, and airline participation in design trades. Fuselage design evaluations considered trade-offs between structural weight, damage resistance/tolerance (repair frequency), and inspection burdens. Analysis methods were developed to assess structural residual strength in the presence of damage, and to evaluate repair design concepts. Repair designs were created with a focus on mechanically fastened concepts for skin/stringer structure and bonded concepts for sandwich structure. Both a large crown (skintstringer) and keel (sandwich) panel were repaired. A compression test of the keel panel indicated the demonstrated repairs recovered ultimate load capability. In conjunction with the design and manufacturing developments, inspection methods were investigated for their potential to evaluate damaged structure and verify the integrity of completed repairs. Flynn, B. W. and Bodine, J. B. and Dopker, B. and Finn, S. R. and Griess, K. H. and Hanson, C. T. and Harris, C. G. and Nelson, K. M. and Walker, T. H. and Kennedy, T. C. and Nahan, M. F. Langley Research Center FUSELAGES; MAINTENANCE; COMPOSITE STRUCTURES; BOLTED JOINTS; BONDED JOINTS; TRANSPORT AIRCRAFT; CIVIL AVIATION; MAINTAINABILITY; STRINGERS; STRUCTURAL WEIGHT; INSPECTION; TRADEOFFS; SKIN (STRUCTURAL MEMBER); ...
