Innovative Design Of Composite Structures

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Composite Structures Design Safety And Innovation

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Author : Dr. Bjorn F. Backman
language : en
Publisher: Elsevier
Release Date : 2005-06-09

Composite Structures Design Safety And Innovation written by Dr. Bjorn F. Backman and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-06-09 with Technology & Engineering categories.

Aerospace structural design, especially for large aircraft, is an empirical pursuit dominated by rules of thumb and often-painful service experiences. Expertise on traditional materials is not transferable to “new materials, processes and structural concepts. This is because it is not based on or derived from well-defined measures of safety. This book addresses the need for safe innovation based on practical, explicit structural safety constraints for use in innovative structures of the future where guiding service experience is non-existent. The book covers new ground by the demonstration of ways to satisfy levels of safety by focusing on structural integrity; and complementing the lack of service experience with risk management, based on flexible inspection methods recognizing that safety is a function of time. Fundamentally the book shoes demonstrates how safety methods can be made available to the engineering community without requiring huge statistical databases to establish internal and external loads distributions for use in reliability analysis. An essential title for anyone working on structural integrity, or composite structures. It will be of equal interest to aerospace engineers and materials scientists working in academia, industry and government. Demonstrates a practically manageable way to produce safe innovation using composites in environments with no service experience New approach to a subject that has not previously been treated in a holistic manner This book could not have come at a more topical time, Boeing are currently launching the first commercial plane made entirely of composite materials The focus of this book is Composite Materials but other fields of innovation could be treated in the same manner

Innovative Design Of Composite Structures The Use Of Curvilinear Fiber Format In Composite Structure Design

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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2018-12-31

Innovative Design Of Composite Structures The Use Of Curvilinear Fiber Format In Composite Structure Design written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12-31 with Science categories.

The gains in structural efficiency are investigated that can be achieved by aligning the fibers in some or all of the layers in a laminate with the principal stress directions in those layers. The name curvilinear fiber format is given to this idea. The problem studied is a plate with a central circular hole subjected to a uniaxial tensile load. An iteration scheme is used to find the fiber directions at each point in the laminate. Two failure criteria are used to evaluate the tensile load capacity of the plates with a curvilinear format, and for comparison, counterpart plates with a conventional straightline fiber format. The curvilinear designs for improved tensile capacity are then checked for buckling resistance. It is concluded that gains in efficiency can be realized with the curvilinear format. Hyer, M. W. and Charette, R. F. NASA-CR-186453, NAS 1.26:186453, VPI-E-90-04 NAG1-901...

Innovative Design Of Composite Structures

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-18

Innovative Design Of Composite Structures written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-18 with categories.

The influence is investigated of a curvilinear fiber format on load carrying capacity of a layered fiber reinforced plate with a centrally located hole. A curvilinear fiber format is descriptive of layers in a laminate having fibers which are aligned with the principal stress directions in those layers. Laminates of five curvilinear fiber format designs and four straightline fiber format designs are considered. A quasi-isotropic laminate having a straightline fiber format is used to define a baseline design for comparison with the other laminate designs. Four different plate geometries are considered and differentiated by two values of hole diameter/plate width equal to 1/6 and 1/3, and two values of plate length/plate width equal to 2 and 1. With the plates under uniaxial tensile loading on two opposing edges, alignment of fibers in the curvilinear layers with the principal stress directions is determined analytically by an iteration procedure. In-plane tensile load capacity is computed for all of the laminate designs using a finite element analysis method. A maximum strain failure criterion and the Tsai-Wu failure criterion are applied to determine failure loads and failure modes. Resistance to buckling of the laminate designs to uniaxial compressive loading is analyzed using the commercial code Engineering Analysis Language. Results indicate that the curvilinear fiber format laminates have higher in-plane tensile load capacity and comparable buckling resistance relative to the straightline fiber format laminates. Charette, R. F. and Hyer, M. W. Unspecified Center COMPOSITE STRUCTURES; FAILURE ANALYSIS; FIBER COMPOSITES; FIBER ORIENTATION; REINFORCED PLATES; STRESS DISTRIBUTION; AXIAL LOADS; BUCKLING; COMPRESSION LOADS; CURVATURE; FINITE ELEMENT METHOD; HOLE GEOMETRY (MECHANICS); STRUCTURAL DESIGN; TENSILE STRESS...

Innovative Design Of Composite Structures

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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher:
Release Date : 2018-10-20

Innovative Design Of Composite Structures written by National Aeronautics and Space Adm Nasa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-20 with categories.

Further studies to determine the potential for using a curvilinear fiber format in the design of composite laminates are reported. The curvilinear format is in contrast to the current practice of having the fibers aligned parallel to each other and in a straight line. The problem of a plate with a central circular hole is used as a candidate problem for this study. The study concludes that for inplane tensile loading the curvilinear format is superior. The limited results to date on compression buckling loads indicate that the curvilinear designs are poorer in resistant buckling. However, for the curvilinear design of interest, the reduction in buckling load is minimal and so overall there is a gain in considering the curvilinear design. Hyer, Michael W. and Charette, Robert F. Unspecified Center NAG1-665...

Design And Analysis Of Composite Structures

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Author : Christos Kassapoglou
language : en
Publisher: John Wiley & Sons
Release Date : 2013-04-23

Design And Analysis Of Composite Structures written by Christos Kassapoglou and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-23 with Technology & Engineering categories.

New edition updated with additional exercises and two new chapters. Design and Analysis of Composite Structures: With Applications to Aerospace Structures, 2nd Edition builds on the first edition and includes two new chapters on composite fittings and the design of a composite panel, as well additional exercises. The book enables graduate students and engineers to generate meaningful and robust designs of complex composite structures. A compilation of analysis and design methods for structural components made of advanced composites, it begins with simple parts such as skins and stiffeners and progresses through to applications such as entire components of fuselages and wings. It provides a link between theory and day-to-day design practice, using theory to derive solutions that are applicable to specific structures and structural details used in industry. Starting with the basic mathematical derivation followed by simplifications used in real-world design,Design and Analysis of Composite Structures: With Applications to Aerospace Structures, 2nd Edition presents the level of accuracy and range of applicability of each method along with design guidelines derived from experience combined with analysis. The author solves in detail examples taken from actual applications to show how the concepts can be applied, solving the same design problem with different methods based on different drivers (e.g. cost or weight) to show how the final configuration changes as the requirements and approach change. Each chapter is followed by exercises that represent specific design problems often encountered in the aerospace industry but which are also applicable in the in the automotive, marine, and construction industries. Updated to include additional exercises, that represent real design problems encountered in the aerospace industry, but which are also applicable in the in the automotive, marine, and construction industries. Includes two new chapters. One on composite fittings and another on application and the design of a composite panel. Provides a toolkit of analysis and design methods that enable engineers and graduate students to generate meaningful and robust designs of complex composite structures. Provides solutions that can be used in optimization schemes without having to run finite element models at each iteration; thus speeding up the design process and allowing the examination of many more alternatives than traditional approaches. Supported by a complete set of lecture slides and solutions to the exercises hosted on a companion website for instructors. An invaluable resource for Engineers and graduate students in aerospace engineering as well as Graduate students and engineers in mechanical, civil and marine engineering.

Innovative Design Of Composite Structures

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-05

Innovative Design Of Composite Structures written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-05 with categories.

The gains in buckling performance are explored that can be achieved by deviating from the conventional straightline fiber format and considering the situation whereby the fiber orientation in a layer, or a group of layers, can vary from point to point. The particular situation studied is a simply supported square plate with a centrally located hole loaded in compression. By using both a sensitivity analysis and a gradient-search technique, fiber orientation in a number of regions of the plate are selected so as to increase the buckling load relative to baseline straightline designs. The sensitivity analysis is used to determine which regions of the plate have the most influence on buckling load, and the gradient search is used to find the design that is believed to represent the absolute maximum buckling load for the conditions prescribed. Convergence studies and sensitivity of the final design are discussed. By examining the stress resultant contours, it is shown how the curvilinear fibers move the load away from the unsupported hole region of the plate to the supported edges, thus increasing the buckling capacity. The tensile capacity of the improved buckling design is investigated, and it is shown that both tensile capacity and buckling capacity can be improved with the curvilinear fiber concept. Hyer, M. W. and Lee, H. H. Unspecified Center NAG1-901...

Composite Structures

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Author : Dr. Bjorn F. Backman
language : en
Publisher: Elsevier
Release Date : 2010-07-07

Composite Structures written by Dr. Bjorn F. Backman and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-07-07 with Technology & Engineering categories.

Composite Structures extends the focus to all the entities that participate in the successful quest for safety and demonstrates how design, manufacturing, maintenance, (inspection), operation, and requirements (regulations) all are part of successful, safe innovation and necessary to assure safe flight through the life of the vehicle. It addresses the notion that safety is a function of time and that vigilant risk management is only successful if it includes all participating entities. It is a companion to the author's first volume, Composite Structure: Design, Safety and Innovation, published by Elsevier in June 2005. Eliminates an unacceptable 'gap' in the world of safety Represents a 'new' approach to designing, manufacturing, maintaining, operating and regulating composite airplane structures Written for professionals in the aerospace structural development arena whether in indusrty, academia or government

Analysis And Design Of Steel And Composite Structures

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Author : Qing Quan Liang
language : en
Publisher: CRC Press
Release Date : 2018-10-08

Analysis And Design Of Steel And Composite Structures written by Qing Quan Liang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-08 with Technology & Engineering categories.

Steel and composite steel–concrete structures are widely used in modern bridges, buildings, sport stadia, towers, and offshore structures. Analysis and Design of Steel and Composite Structures offers a comprehensive introduction to the analysis and design of both steel and composite structures. It describes the fundamental behavior of steel and composite members and structures, as well as the current design criteria and procedures given in Australian standards AS/NZS 1170, AS 4100, AS 2327.1, Eurocode 4, and AISC-LRFD specifications. Featuring numerous step-by-step examples that clearly illustrate the detailed analysis and design of steel and composite members and connections, this practical and easy-to-understand text: Covers plates, members, connections, beams, frames, slabs, columns, and beam-columns Considers bending, axial load, compression, tension, and design for strength and serviceability Incorporates the author’s latest research on composite members Analysis and Design of Steel and Composite Structures is an essential course textbook on steel and composite structures for undergraduate and graduate students of structural and civil engineering, and an indispensable resource for practising structural and civil engineers and academic researchers. It provides a sound understanding of the behavior of structural members and systems.

Innovative Design Of Composite Structures

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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher:
Release Date : 2018-11-12

Innovative Design Of Composite Structures written by National Aeronautics and Space Adm Nasa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-12 with categories.

The study focuses on the axisymmetric deformation response of unsymmetrically laminate cylinders loaded in axial compression by known loads. A geometrically nonlinear analysis is used. Though buckling is not studied, the deformations can be considered to be the prebuckling response. Attention is directed at three 16 layer laminates: a (90 sub 8/0 sub 8) sub T; a (0 sub 8/90 sub 8) sub T and a (0/90) sub 4s. The symmetric laminate is used as a basis for comparison, while the two unsymmetric laminates were chosen because they have equal but opposite bending-stretching effects. Particular attention is given to the influence of the thermally-induced preloading deformations that accompany the cool-down of any unsymmetric laminate from the consolidation temperature. Simple support and clamped boundary conditions are considered. It is concluded that: (1) The radial deformations of an unsymmetric laminate are significantly larger than the radial deformations of a symmetric laminate, although for both symmetric and unsymmetric laminates the large deformations are confined to a boundary layer near the ends of the cylinder; (2) For this nonlinear problem the length of the boundary layer is a function of the applied load; (3) The sign of the radial deformations near the supported end of the cylinder depends strongly on the sense (sign) of the laminate asymmetry; (4) For unsymmetric laminates, ignoring the thermally-induced preloading deformations that accompany cool-down results in load-induced deformations that are under predicted; and (5) The support conditions strongly influence the response but the influence of the sense of asymmetry and the influence of the thermally-induced preloading deformations are independent of the support conditions. Hyer, M. W. and Paraska, P. J. Unspecified Center ASYMMETRY; AXIAL STRAIN; CIRCULAR CYLINDERS; COMPRESSING; DEFORMATION; LAMINATES; STRUCTURAL DESIGN; BOUNDARY LAYERS; BUCKLING; CONFINEMENT; CONSOLIDATION; COOLING; LOADS (FORCES); NONLI...

Composite Structures

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Author : Dr. Bjorn F. Backman
language : en
Publisher: Elsevier Science
Release Date : 2008-07-08

Composite Structures written by Dr. Bjorn F. Backman and has been published by Elsevier Science this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-08 with Technology & Engineering categories.

Composite Structures extends the focus to all the entities that participate in the successful quest for safety and demonstrates how design, manufacturing, maintenance, (inspection), operation, and requirements (regulations) all are part of successful, safe innovation and necessary to assure safe flight through the life of the vehicle. It addresses the notion that safety is a function of time and that vigilant risk management is only successful if it includes all participating entities. It is a companion to the author's first volume, Composite Structure: Design, Safety and Innovation, published by Elsevier in June 2005. Eliminates an unacceptable 'gap' in the world of safety Represents a 'new' approach to designing, manufacturing, maintaining, operating and regulating composite airplane structures Written for professionals in the aerospace structural development arena whether in indusrty, academia or government