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Author : Sascha Marc Häusler
Publisher :
ISBN 13 : 9783869557748
Total Pages : 257 pages
Book Rating : 4.5/5 (577 download)
Download or read book Damage Tolerance Investigations of Innovative Metallic Airframe Structures written by Sascha Marc Häusler and published by . This book was released on 2011 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sascha Häusler
Publisher : Cuvillier Verlag
ISBN 13 : 3736937741
Total Pages : 288 pages
Book Rating : 4.7/5 (369 download)
Download or read book Damage tolerance investigations of innovative metallic airframe structures written by Sascha Häusler and published by Cuvillier Verlag. This book was released on 2011-06-10 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The continuously expanding commercial air traffic of the last decades steadily increased the demand for highly efficient aircraft which offer extended operation times while reducing costs and environmental impact at the same time. The associated design requirements for reduced structural weight and improved fatigue life represent the major challenges for todays aircraft structures and have significantly intensified the competition between metallic and composite airframe applications. New metallic design concepts try to face this competition by combining latest materials and innovative manufacturing methods, like high speed machining, laser beam welding or friction stir welding, which allows for possible savings with respect to structural weight and manufacturing costs. However, due to their integral characteristics, the damage tolerance behaviour of these new designs is generally inferior to the common differential design. Reliable estimations on the fatigue life of integrally stiffened structures consequently necessitate assessment methodologies that are capable to include additional manufacturing influences and offer numerical efficiency in order to be practical for parametric studies during airframe design. Therefore, the development and enhancement of simulation methods for efficient and reliable evaluation of cracks and crack growth represents the main objective of this thesis. Two simulation methods are implemented and investigated for this purpose, that are based on different approaches and intended for distinct applications. One method is based on analytical stress function expressions and enables a very efficient evaluation of the complete fatigue crack growth life of cracked airframe structures. The proposed approach in this context is generally based on plane assumptions and limited to pure mode I crack loading. In order to be able to additionally consider crack turning under mixed mode loading, a second simulation method is presented which implements an extended finite element framework for a mesh independent representation of cracks in two dimensions. The additional combination with the material force concept, as alternative crack state parameter, allows for automated simulations of crack growth under mixed mode loading without any need for remeshing operations. Both simulation methods are validated based on different crack configurations and are applied for crack growth investigations of varying configurations of integrally stiffened panels under pure mode I and mixed mode loading conditions. In this context, a special focus is set on the influences of additional internal stresses that follow either from the applied manufacturing processes or an intentional prestressing of the stiffeners. Despite the general limitation to plane considerations, the proposed methods show a good accordance with experimental, theoretical and alternative numerical results. This demonstrates their capabilities to simulate fatigue crack growth and crack turning in integrally stiffened airframe structures and motivates further research with respect to a possible extension to three-dimensional problems.
Author : Sérgio M. O. Tavares
Publisher : Springer
ISBN 13 : 3319701908
Total Pages : 117 pages
Book Rating : 4.3/5 (197 download)
Download or read book Damage Tolerance of Metallic Aircraft Structures written by Sérgio M. O. Tavares and published by Springer. This book was released on 2018-08-06 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a state-of-the-art review of the fail-safe and damage tolerance approaches, allowing weight savings and increasing aircraft reliability and structural integrity. The application of the damage tolerance approach requires extensive know-how of the fatigue and fracture properties, corrosion strength, potential failure modes and non-destructive inspection techniques, particularly minimum detectable defect and inspection intervals. In parallel, engineering practice involving damage tolerance requires numerical techniques for stress analysis of cracked structures. These evolved from basic mode I evaluations using rough finite element approaches, to current 3D modeling based on energetic approaches as the VCCT, or simulation of joining processes. This book provides a concise introduction to this subject.
Author : M. S. Rosenfeld
Publisher : ASTM International
ISBN 13 : 9780803100312
Total Pages : 264 pages
Book Rating : 4.1/5 (3 download)
Download or read book Damage Tolerance in Aircraft Structures written by M. S. Rosenfeld and published by ASTM International. This book was released on 1971-03 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (423 download)
Download or read book Review of Damage Tolerance for Composite Sandwich Airframe Structures written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of composite sandwich construction is rapidly increasing in current and future airframe designs especially for general aviation aircraft and rotorcraft. Typically, sandwich constructions for these applications use thin-gage composite facesheets (0.020" to 0.045") which are cocured to honeycomb and foam cores. Due to the nature of these structures, damage tolerance is more complex than conventional laminated structures. Besides typical damage concerns such as through penetration and delamination, additional modes including core crushing and facesheet debonding must also be addressed. This complicates the certification process by introducing undefined Allowable Damage Limits (ADL) and Critical Damage Thresholds (CDT) as related to the ultimate and limit load carrying capability of the structure. This document provides a background review of previous damage tolerance investigations including an overview of traditional metallic damage tolerance methodologies. illustrative summaries are presented which show the scope of previous investigation parameters such as impact energy, facesheet thickness, and core thickness of typical sandwich constructions. Also included is a compilation of damage tolerance certification procedures and regulations taken from FAR Part 23-29 for composite damage tolerance as well as recommendations from associated Advisory Circulars. Past and current airframe industry sandwich constructions which show the scope of current and future sandwich designs were also surveyed. In conclusion, a proposed future research approach and its methodology are presented which should aid in establishing certification guidelines and confidence involving the damage tolerance of sandwich constructions as they apply to general aviation aircraft and rotorcraft.
Author : A.A. Baker
Publisher : Elsevier
ISBN 13 : 0080522955
Total Pages : 561 pages
Book Rating : 4.0/5 (85 download)
Download or read book Advances in the Bonded Composite Repair of Metallic Aircraft Structure written by A.A. Baker and published by Elsevier. This book was released on 2003-01-23 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Lorrie Molent
Publisher : Springer Nature
ISBN 13 : 9819974682
Total Pages : 69 pages
Book Rating : 4.8/5 (199 download)
Download or read book Aircraft Fatigue Management written by Lorrie Molent and published by Springer Nature. This book was released on 2024-01-23 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue occurs under cyclic loading and can significantly degrade the operational capability and safety of metallic aircraft components and structures. This book provides summaries of some metallic aircraft structural integrity issues, innovative but established examples of maintaining operational capability—airworthiness, and assessments of safe in-service fatigue lives. These topics are based on a through-life fatigue management philosophy that ensures safe and continued operation, including during life extensions that are almost inevitably required. This philosophy is underpinned by observations of the behaviour of fatigue cracks in actual structures subjected to realistic service loading conditions. The book includes topics like aircraft design requirements, individual aircraft fatigue loads monitoring, airframe fatigue testing, sources of fatigue-nucleating discontinuities, and prediction of fatigue crack growth from these discontinuities. All these aspects contribute to discussing methods of assuring the structural integrity and operational capability of realistically cracked structures. The book also discusses the exponential behaviour of lead or dominant cracks—those leading to first failure—and the practical significance of differences between fatigue fracture topographies produced under constant amplitude and variable amplitude loading. The book can be a valuable reference for researchers and professionals interested in aircraft fatigue management and allied fields.
Author :
Publisher :
ISBN 13 :
Total Pages : 636 pages
Book Rating : 4.E/5 ( download)
Download or read book USAF Damage Tolerant Design Handbook written by and published by . This book was released on 1984 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Society for Testing and Materials
Publisher : ASTM International
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4./5 ( download)
Download or read book Damage Tolerance in Aircraft Structures written by American Society for Testing and Materials and published by ASTM International. This book was released on 1971 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rhys Jones
Publisher : Butterworth-Heinemann
ISBN 13 : 008100544X
Total Pages : 972 pages
Book Rating : 4.0/5 (81 download)
Download or read book Aircraft Sustainment and Repair written by Rhys Jones and published by Butterworth-Heinemann. This book was released on 2017-12-05 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Ad Vlot
Publisher : Springer Science & Business Media
ISBN 13 : 9781402000386
Total Pages : 556 pages
Book Rating : 4.0/5 (3 download)
Download or read book Fibre Metal Laminates written by Ad Vlot and published by Springer Science & Business Media. This book was released on 2001-09-30 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like New, No Highlights,No Markup,all pages are intact.
Author : Jun Liu
Publisher : Springer
ISBN 13 : 9811083991
Total Pages : 160 pages
Book Rating : 4.8/5 (11 download)
Download or read book Long-Life Design and Test Technology of Typical Aircraft Structures written by Jun Liu and published by Springer. This book was released on 2018-05-21 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses anti-fatigue manufacturing, analysis and test verification technologies for typical aircraft structures, including fastening holes, shot peening plates, different types of joints and wing boxes. Offering concrete solutions to practical problems in aircraft engineering, it will benefit researchers and engineers in the fields of Aerospace Technology and Astronautics.
Author : Charles E. Harris
Publisher :
ISBN 13 :
Total Pages : 598 pages
Book Rating : 4.3/5 (126 download)
Download or read book FAA/NASA International Symposium on Advanced Structural Integrity Methods for Airframe Durability and Damage Tolerance written by Charles E. Harris and published by . This book was released on 1994 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Committee on New Materials for Advanced Civil Aircraft
Publisher : National Academies Press
ISBN 13 : 0309588782
Total Pages : 99 pages
Book Rating : 4.3/5 (95 download)
Download or read book New Materials for Next-Generation Commercial Transports written by Committee on New Materials for Advanced Civil Aircraft and published by National Academies Press. This book was released on 1996-03-29 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major objective of this book was to identify issues related to the introduction of new materials and the effects that advanced materials will have on the durability and technical risk of future civil aircraft throughout their service life. The committee investigated the new materials and structural concepts that are likely to be incorporated into next generation commercial aircraft and the factors influencing application decisions. Based on these predictions, the committee attempted to identify the design, characterization, monitoring, and maintenance issues that are critical for the introduction of advanced materials and structural concepts into future aircraft.
Author :
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (1 download)
Download or read book Impact Damage Characterization and Damage Tolerance of Composite Sandwich Airframe Structures written by and published by . This book was released on 2002 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact responses and the damage states in flat composite sandwich panels with thin face sheets were investigated in Phase I and were found to be dependent on the diameter of the spherical steel impactor. The residual strength of impact-damaged sandwich panels under static in-plane compressive loads was reported to be dependent on the nature of the damage state. The impact damage due to blunt impactors is difficult to detect in service and depending on the size of the damage, can degrade the residual strength more than a punctured skin. The detectability of impact damage states using different field inspection techniques was experimentally investigated for different facesheet and core combinations. The impact damage in honeycomb core sandwich panels was better detected using instruments that exploit the local vibrational characteristics of the sandwich structure, while the damage in foam core panels was more amenable to acoustic-based techniques. The effect of facesheet stiffness on the sensitivity of the field inspection techniques was investigated and the results are reported. The behavior of the sandwich panels with impact damage and subjected to the in-plane static compressive loads was investigated in detail. The impact damage behaved in a characteristic sequence of events leading to contrasting final failure modes. The sequence of events was found to be dependent on the facesheet stiffness and the transverse compressive properties of the core material. The effects of panel curvature on the impact damage resistance of sandwich panels were experimentally investigated for limited sandwich configurations. The effects of the radius of cylindrical panels, boundary conditions, facesheet type, and core type were also examined. The decreasing radius of curvature increased the global bending stiffness but decreased the local contact stiffness due to the radial compressive properties of the honeycomb core.
Author : S. G. Pantelakis
Publisher : Springer Science & Business Media
ISBN 13 : 1402094027
Total Pages : 554 pages
Book Rating : 4.4/5 (2 download)
Download or read book Engineering Against Fracture written by S. G. Pantelakis and published by Springer Science & Business Media. This book was released on 2009-02-14 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the last thirty years there is a growing acknowledgement that prevention of catastrophic failures necessitates engagement of a large pool of expertise. Herein it is not excessive to seek advice from disciplines like materials science, structural engineering, mathematics, physics, reliability engineering and even economics. Today’s engineering goals, independently of size; do not have the luxury of being outsideaglobalperspective.Survivaloftheintegratedmarketsand?nancialsystems require a web of safe transportation, energy production and product manufacturing. It is perhaps the ?rst decade in engineering history that multidisciplinary - proaching is not just an idea that needs to materialise but has matured beyond infancy. We can witness such transition by examining engineering job descriptions and postgraduate curricula. The undertaking of organising a conference to re?ect the above was not easy and de?nitely, not something that was brought to life without a lot of work and c- st mitment. The 1 Conference of Engineering Against Fracture from its conceptual day until completion was designed in a way of underlying the need of bringing all the key players on a common ground that once properly cultivated can ?ourish. To achieve that the conference themes were numerous and despite their, in principle notional differences, it was apparent that the attendees established such common ground through argumentation. The reader can see this from the variety of research areas re?ected by the works and keynote lecturers presented.
Author : J. R. Gebman
Publisher : RAND Corporation
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)
Download or read book Opportunities for Systems Engineering to Contribute to Durability and Damage Tolerance of Hybrid Structures for Airframes written by J. R. Gebman and published by RAND Corporation. This book was released on 2008 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structures making up airframes must be durable and damage tolerant, and the means of ensuring that they are have long been well defined for structures made of metal. But a host of new hybrid materials, some of which contain no metal, are now being used, and these can present new damage mechanisms that engineers must address. The Air Force has established a general approach to airframe durability and damage tolerance. The author examines that approach and considers ways it will need to adapt for the new materials. Given the variety of materials, processes, and end uses involved, the engineering effort will necessarily involve multiple specialties. In these circumstances, the tailoring process could benefit from the efforts of systems engineers. The report addresses both technical and programmatic concerns and identifies opportunities for materials and structural engineers to collaborate with systems engineers. Finally, it offers a framework for collaboration.
