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Author : Stephen J. Hales
Publisher : DIANE Publishing
Page : 54 pages
File Size : 51,5 Mb
Release : 2001
Category : Aluminum-lithium alloys
ISBN : 9781428996083
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
Page : 56 pages
File Size : 47,5 Mb
Release : 2018-09-21
Category : Electronic
ISBN : 1723890189
The objective of this investigation was to establish the relationship between mechanical property anisotropy, microstructure and crystallographic texture in integrally 'T'-stiffened extruded panels fabricated from the Al-Li alloys 2195, 2098 and 2096. In-plane properties were measured as a function of orientation at two locations in the panels, namely mid-way between (Skin), and directly beneath (Base), the integral 'T' stiffeners. The 2195 extrusion exhibited the best combination of strength and toughness, but was the most anisotropic. The 2098 extrusion exhibited lower strength and comparable toughness, but was more isotropic than 2195. The 2096 extrusion exhibited the lowest strength and poor toughness, but was the most isotropic. All three alloys exhibited highly elongated grain structures and similar location-dependent variations in grain morphology. The textural characteristics comprised a beta + fiber texture, similar to rolled product, in the Skin regions and alpha + fiber texture, comparable to axisymmetric extruded product, in the Base regions. In an attempt to quantitatively correlate texture with yield strength anisotropy, the original 'full constraint' Taylor model and a variant of the 'relaxed constraint' model, explored by Wert et al., were applied to the data. A comparison of the results revealed that the Wert model was consistently more accurate than the Taylor model.Hales, Stephen J. and Hafley, Robert A.Langley Research CenterCORRELATION; MICROSTRUCTURE; MECHANICAL PROPERTIES; CRYSTALLOGRAPHY; ALUMINUM-LITHIUM ALLOYS; ANISOTROPY; EXTRUDING; YIELD STRENGTH
Author : K.V. Jata,A.K. Singh
Publisher : Elsevier Inc. Chapters
Page : 608 pages
File Size : 47,8 Mb
Release : 2013-09-20
Category : Technology & Engineering
ISBN : 9780128068434
This chapter describes the development of crystallographic texture and its effects on mechanical properties in aluminum-lithium alloys. Crystallographic texture evolves during the forming of wrought products from cast ingots of Al-Li alloys and consequently affects the mechanical properties. Practical approaches to control the texture have been developed and have been successfully used in the products obtained from industrial-scale ingots. This texture tailoring has significantly reduced the yield strength anisotropy. In addition, theoretical approaches have been used to model the yield strength anisotropy of aluminum alloys in the presence of complex precipitates.
Author : Anonim
Publisher : Unknown
Page : 636 pages
File Size : 42,9 Mb
Release : 2003
Category : Government publications
ISBN : OSU:32437122107135
Author : N Eswara Prasad,Amol Gokhale,R.J.H Wanhill
Publisher : Butterworth-Heinemann
Page : 608 pages
File Size : 52,8 Mb
Release : 2013-09-20
Category : Technology & Engineering
ISBN : 9780124016798
Because lithium is the least dense elemental metal, materials scientists and engineers have been working for decades to develop a commercially viable aluminum-lithium (Al-Li) alloy that would be even lighter and stiffer than other aluminum alloys. The first two generations of Al-Li alloys tended to suffer from several problems, including poor ductility and fracture toughness; unreliable properties, fatigue and fracture resistance; and unreliable corrosion resistance. Now, new third generation Al-Li alloys with significantly reduced lithium content and other improvements are promising a revival for Al-Li applications in modern aircraft and aerospace vehicles. Over the last few years, these newer Al-Li alloys have attracted increasing global interest for widespread applications in the aerospace industry largely because of soaring fuel costs and the development of a new generation of civil and military aircraft. This contributed book, featuring many of the top researchers in the field, is the first up-to-date international reference for Al-Li material research, alloy development, structural design and aerospace systems engineering. Provides a complete treatment of the new generation of low-density AL-Li alloys, including microstructure, mechanical behavoir, processing and applications Covers the history of earlier generation AL-Li alloys, their basic problems, why they were never widely used, and why the new third generation Al-Li alloys could eventually replace not only traditional aluminum alloys but more expensive composite materials Contains two full chapters devoted to applications in the aircraft and aerospace fields, where the lighter, stronger Al-Li alloys mean better performing, more fuel-efficient aircraft
Author : Anonim
Publisher : Unknown
Page : 166 pages
File Size : 52,8 Mb
Release : 2002
Category : Electronic
ISBN : NASA:31769000645625
Author : National Aeronautics and Space Adm Nasa
Publisher : Unknown
Page : 78 pages
File Size : 54,9 Mb
Release : 2018-11-05
Category : Electronic
ISBN : 1730820514
Aluminum-lithium (Al-Li) alloys near net shape extrusions are being evaluated for potential application in launch vehicle structures. The objective of this study was to determine tensile and fracture properties, corrosion resistance, and weldability of integrally stiffened panels of Al-Cu-Li alloy 2090 in the T8 temper. The microstructure was pre-dominantly unrecrystallized. Texture analyses revealed the presence of fiber components in the stiffeners and a combination of fiber and rolling components in the skin. Variations in grain morphology and texture through the extruded cross section were correlated with the tensile, fracture, and corrosion behavior. Tensile strengths at room and cryogenic temperatures of the 2090 extrusions were similar to other 2090 product forms and were higher than 2219-T87, the primary structural material in the Space Shuttle external tank; however, ductilities were lower. The fracture resistance of the 2090 extrusion was lower than 2219-T87 plate at room temperature. At cryogenic temperatures, tensile ductility and fracture behavior of the 2090 extrusion were similar to other 2090 product forms but were lower than 2219-T87 plate. The exfoliation and stress corrosion resistance of the 2090 extrusion compared favorably with the characteristics of other 2090 product forms. The weldability and weldment properties of the extrusions were similar to 2090 and 2219 plates. Birt, M. J. and Domack, M. S. and Hafley, R. A. and Pollock, W. D. Langley Research Center...
Author : M. J. Birt
Publisher : Unknown
Page : 80 pages
File Size : 53,8 Mb
Release : 1998
Category : Electronic
ISBN : NASA:31769000629249
Author : Anonim
Publisher : Unknown
Page : 1478 pages
File Size : 44,6 Mb
Release : 1990
Category : Metallurgy
ISBN : CORNELL:31924056501947
Author : Anonim
Publisher : Unknown
Page : 602 pages
File Size : 53,7 Mb
Release : 1995
Category : Aeronautics
ISBN : MINN:30000006324614
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : Anonim
Publisher : Unknown
Page : 1042 pages
File Size : 51,8 Mb
Release : 1999
Category : Aeronautics
ISBN : STANFORD:36105021810408
Author : Alan Russell,Kok Loong Lee
Publisher : John Wiley & Sons
Page : 440 pages
File Size : 43,6 Mb
Release : 2005-07-08
Category : Technology & Engineering
ISBN : 9780471708537
This junior/senior textbook presents fundamental concepts ofstructure property relations and a description of how theseconcpets apply to every metallic element except iron. Part One of the book describes general concepts of crystalstructure, microstructure and related factors on the mechanical,thermal, magnetic and electronic properties of nonferrous metals,intermetallic compounds and metal matrix composites. Part Two discusses all the nonferrous metallic elements from twoperspectives: First it explains how the concepts presented in PartOne define the properties of a particular metallic element and itsalloys. Second is a description of the major engineering uses ofeach metal. This section features sidebar pieces describingparticular physical property oddities, engineering applications andcase studies. An Instructor's Manual presenting detailed solutionsto all the problems in the book is available from the Wileyeditorial department. An Instructor's Manual presenting detailed solutions to all theproblems in the book is available from the Wiley editorialdepartment.
Author : Institute of Metals
Publisher : Unknown
Page : 616 pages
File Size : 48,6 Mb
Release : 1953
Category : Metallurgy
ISBN : MINN:319510008633628
Author : Adrian P Mouritz
Publisher : Elsevier
Page : 640 pages
File Size : 45,9 Mb
Release : 2012-05-23
Category : Technology & Engineering
ISBN : 9780857095152
The structural materials used in airframe and propulsion systems influence the cost, performance and safety of aircraft, and an understanding of the wide range of materials used and the issues surrounding them is essential for the student of aerospace engineering.Introduction to aerospace materials reviews the main structural and engine materials used in aircraft, helicopters and spacecraft in terms of their production, properties, performance and applications. The first three chapters of the book introduce the reader to the range of aerospace materials, focusing on recent developments and requirements. Following these introductory chapters, the book moves on to discuss the properties and production of metals for aerospace structures, including chapters covering strengthening of metal alloys, mechanical testing, and casting, processing and machining of aerospace metals. The next ten chapters look in depth at individual metals including aluminium, titanium, magnesium, steel and superalloys, as well as the properties and processing of polymers, composites and wood. Chapters on performance issues such as fracture, fatigue and corrosion precede a chapter focusing on inspection and structural health monitoring of aerospace materials. Disposal/recycling and materials selection are covered in the final two chapters. With its comprehensive coverage of the main issues surrounding structural aerospace materials,Introduction to aerospace materials is essential reading for undergraduate students studying aerospace and aeronautical engineering. It will also be a valuable resource for postgraduate students and practising aerospace engineers. Reviews the main structural and engine materials used in aircraft, helicopters and space craft in terms of their properties, performance and applications Introduces the reader to the range of aerospace materials, focusing on recent developments and requirements, and discusses the properties and production of metals for aerospace structures Chapters look in depth at individual metals including aluminium, titanium, magnesium, steel and superalloys
Author : Anonim
Publisher : Unknown
Page : 1058 pages
File Size : 48,5 Mb
Release : 1988
Category : Alloys
ISBN : UOM:39015030246626
