Reducing the Stress Concentration Around Circular Holes in Laminated Composites PDF Download
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Author: Rosen T. Tenchev
Publisher:
ISBN: 9788255309048
Category :
Languages : en
Pages : 26
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Book Description
Author: Rosen T. Tenchev
Publisher:
ISBN: 9788255309048
Category :
Languages : en
Pages : 26
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Book Description
Author: Seng C. Tan
Publisher: Routledge
ISBN: 135141335X
Category : Technology & Engineering
Languages : en
Pages : 486
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Book Description
From the Author's PrefaceThe objective of this book is to provide a thorough and systematic study of the problem of laminated composites containing stress concentrations. Stress concentrations are introduced in laminated plates in the forms of circular holes, elliptical openings and straight cracks. These forms of cutouts have many practical applications, and are familiar to most engineers. Stress concentrations exist in all known structural components. Stress concentrations have great practical importance because they are normally the cause of failure. In addition to stress analyses of laminated composites, we need more fundamental understanding of the failure mode, the failure criterion, the effects on global laminate response, and the design of composites in the presence of stress concentrations. In this book, all the subjects studied are closely related to the problem of stress concentrations in laminated composites . . . . All the models are verified with many experimental results. The underlying objective of this comprehensive study is to give the readers an in-depth and thorough understanding of the problem of stress concentrations in composites. This book is the first to address the problem of laminated composites containing stress concentrations in a systematic way.
Author: David Lee Saba
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 0
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Book Description
The purpose of this research was to show, both experimentally and analytically, that the stress concentration around holes in laminated fibrous composites is not adequately described by the theoretical solution for homogeneous orthotropic plates, and that it is a function of hole size. It was shown that the gross laminate properties, determined analytically from individual laminate properties, make it impossible to express the proper boundary conditions at a free edge. A new expression for the modulus of elasticity tangential to a free boundary was developed. Thus, the problem became similar to that of a circular hole strengthened by an elastic ring. Furthermore, the effective width of such a ring was found to depend upon hole size. Thus, the stress concentration factor was shown to be a function of hole size, which was not predicted by homogeneous orthotropic theory. These results were very satisfactorily verified by experiment. (Author).
Author: Richard M. Barker
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 25
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Book Description
Stress concentration factors are determined using a three-dimensional finite-element analysis for laminated composites pierced by circular, square and diamond-shaped holes. Both angel-ply and bidirectional laminates are investigated for hole size to width-of- strip ratios from 0.125 to 0.41. Normal stress concentrations are found to be the least for square holes and greatest for diamond-shaped holes. Interlaminar shear stress concentrations which cannot be determined by a two-dimensional analysis, are as large at the hole surface as those at the free edge when angle-ply laminates are utilized and the holes are large. For small circular holes, angle-ply (+ or -45) LAMINATES ARE RECOMMENDED. When large holes are present, bidirectional (90/0) laminates are shown to be more efficient. (Author-PL).
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722804985
Category :
Languages : en
Pages : 26
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Book Description
The theory of anisotropic elasticity was used to evaluate the anisotropic stress concentration factors of a composite laminated plate containing a small circular hole. This advanced composite material was used to manufacture the X-29A forward swept wing. Observe that the usual isotropic material stress concentration factor is three. However, for composite material, it was found that the anisotropic stress concentration factor is no longer constant, and that the locations of maximum tangential stress points could shift by changing the fiber orientation with respect to the loading axis. The analysis showed that through the lamination process, the stress concentration factor could be drastically reduced, and therefore the structural performance could be improved. Both the mixture rule approach and the constant strain approach were used to calculate the stress concentration factor. The results predicted by the mixture rule approach were about 20 percent deviate from the experimental data. However, the results predicted by the constant strain approach matched the testing data very well. This showed the importance of the inplane shear effect on the evaluation of stress concentration factor for the X-29A composite plate. Yeh, Hsien-Yang Unspecified Center NGT-05020412; RTOP 533-02-51...
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729178423
Category : Science
Languages : en
Pages : 44
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Book Description
The theory of anisotropic elasticity was used to evaluate the anisotropic stress concentration factors of a composite laminated plate containing a small circular hole. This advanced composite was used to manufacture the X-29A forward-swept wing. It was found for composite material, that the anisotropic stress concentration is no longer a constant, and that the locations of maximum tangential stress points could shift by changing the fiber orientation with respect to the loading axis. The analysis showed that through the lamination process, the stress concentration factor could be reduced drastically, and therefore the structural performance could be improved. Both the mixture rule approach and the constant strain approach were used to calculate the stress concentration factor of room temperature. The results predicted by the mixture rule approach were about twenty percent deviate from the experimental data. However, the results predicted by the constant strain approach matched the testing data very well. This showed the importance of the inplane shear effect on the evaluation of the stress concentration factor for the X-29A composite plate. Yeh, Hsien-Yang Unspecified Center NGT-05-020-412; RTOP 533-02-5
Author: P.K. Mallick
Publisher: CRC Press
ISBN: 9780824793043
Category : Technology & Engineering
Languages : en
Pages : 1270
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Book Description
Offers information on the fundamental principles, processes, methods and procedures related to fibre-reinforced composites. The book presents a comparative view, and provides design properties of polymeric, metal, ceramic and cement matrix composites. It also gives current test methods, joining techniques and design methodologies.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
Author: Walter D. Pilkey
Publisher: John Wiley & Sons
ISBN: 1119532523
Category : Technology & Engineering
Languages : en
Pages : 816
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Book Description
The bible of stress concentration factors—updated to reflect today's advances in stress analysis This book establishes and maintains a system of data classification for all the applications of stress and strain analysis, and expedites their synthesis into CAD applications. Filled with all of the latest developments in stress and strain analysis, this Fourth Edition presents stress concentration factors both graphically and with formulas, and the illustrated index allows readers to identify structures and shapes of interest based on the geometry and loading of the location of a stress concentration factor. Peterson's Stress Concentration Factors, Fourth Edition includes a thorough introduction of the theory and methods for static and fatigue design, quantification of stress and strain, research on stress concentration factors for weld joints and composite materials, and a new introduction to the systematic stress analysis approach using Finite Element Analysis (FEA). From notches and grooves to shoulder fillets and holes, readers will learn everything they need to know about stress concentration in one single volume. Peterson's is the practitioner's go-to stress concentration factors reference Includes completely revised introductory chapters on fundamentals of stress analysis; miscellaneous design elements; finite element analysis (FEA) for stress analysis Features new research on stress concentration factors related to weld joints and composite materials Takes a deep dive into the theory and methods for material characterization, quantification and analysis methods of stress and strain, and static and fatigue design Peterson's Stress Concentration Factors is an excellent book for all mechanical, civil, and structural engineers, and for all engineering students and researchers.
Author: Holm Altenbach
Publisher: Springer
ISBN: 3709125448
Category : Technology & Engineering
Languages : en
Pages : 302
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Book Description
The aim of the book is to give a clear picture of some new modern trends in composite mechanics and to give a presentation of the current state-of-the-art of the theory and application of composite laminates. The book addresses the basics as well as recent developments in the theory of laminates and their effective properties, the problem of testing and identification of properties, strength, damage, and failure of composite laminates, lightweight construction principles, optimization techniques, the generation of smart structures, and a number of special technical aspects (e.g. stress localization), their modelling and analysis. The intention of the book is to provide deeper understanding, to give mathematical and algorithmic techniques for analysis, simulation and optimization and to link various aspects of composite mechanics as necessary to exploit the full potential that is possible for composite structures.
