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Author: Stephen Spottswood
Publisher:
ISBN: 9781423546351
Category :
Languages : en
Pages : 187
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Book Description
The objective of this research was to determine the physical response, including material failure, of a curved composite panel designed to resist transverse loading. The cause of the material failure, in the form of delamination, fiber and/or matrix failure, was determined through various criterion based on non-linear movement using a finite element analysis technique. Data generated both with and without the addition of progressive failure criteria, was compared with previously published experimental data, noting where the theory diverges from the experimental results. The inclusion of various failure criterion, to include maximum stress, Lee, and Hashin, provided a more realistic representation of the total physical response of the shell. Once an approximate range of accurate physical representation was realized, progressive failure of composite sandwich shells under transverse loading were examined. Results of the analytic comparison with the published experimental data indicate that the SLR theory overpredicts the stiffness of the various shells for both the cases considering and not considering failure criteria. Furthermore, matrix failure patterns predicted by all three criterion were similar to the experimental results. Core failures predicted in the composite sandwich analysis were similar between the failure criterion.
Author: Stephen Spottswood
Publisher:
ISBN: 9781423546351
Category :
Languages : en
Pages : 187
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Book Description
The objective of this research was to determine the physical response, including material failure, of a curved composite panel designed to resist transverse loading. The cause of the material failure, in the form of delamination, fiber and/or matrix failure, was determined through various criterion based on non-linear movement using a finite element analysis technique. Data generated both with and without the addition of progressive failure criteria, was compared with previously published experimental data, noting where the theory diverges from the experimental results. The inclusion of various failure criterion, to include maximum stress, Lee, and Hashin, provided a more realistic representation of the total physical response of the shell. Once an approximate range of accurate physical representation was realized, progressive failure of composite sandwich shells under transverse loading were examined. Results of the analytic comparison with the published experimental data indicate that the SLR theory overpredicts the stiffness of the various shells for both the cases considering and not considering failure criteria. Furthermore, matrix failure patterns predicted by all three criterion were similar to the experimental results. Core failures predicted in the composite sandwich analysis were similar between the failure criterion.
Author: Stephen Michael Spottswood (LT, USAF.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Book Description
Author: Margarita Akterskaia
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781723748691
Category : Science
Languages : en
Pages : 28
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Book Description
Progressive failure analyses results are presented for composite panels with and without a cutout and subjected to in-plane shear loading and compression loading well into their postbuckling regime. Ply damage modes such as matrix cracking, fiber-matrix shear, and fiber failure are modeled by degrading the material properties. Results from finite element analyses are compared with experimental data. Good agreement between experimental data and numerical results are observed for most structural configurations when initial geometric imperfections are appropriately modeled.Jaunky, Navin and Ambur, Damodar R. and Davila, Carlos G. and Hilburger, Mark and Bushnell, Dennis M. (Technical Monitor)Langley Research CenterCOMPOSITE STRUCTURES; FAILURE ANALYSIS; BUCKLING; DYNAMIC STRUCTURAL ANALYSIS; COMPRESSION LOADS; FINITE ELEMENT METHOD; FIBER-MATRIX INTERFACES
Author: Damodar R. Ambur
Publisher: DIANE Publishing
ISBN: 1428995536
Category :
Languages : en
Pages : 25
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Book Description
Author: Navin Jaunky
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
Progressive failure analyses results are presented for composite panels with and without a cutout and subjected to in-plane shear loading and compression loading well into their postbuckling regime. Ply damage modes such as matrix cracking, fiber-matrix shear, and fiber failure are modeled by degrading the material properties. Results from finite element analyses are compared with experimental data. Good agreement between experimental data and numerical results are observed for most structural configurations when initial geometric imperfections are appropriately modeled.
Author: David W. Sleight
Publisher:
ISBN:
Category : Laminated materials
Languages : en
Pages : 98
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Book Description
Author: Pengfei Liu
Publisher: Elsevier
ISBN: 0128209631
Category : Technology & Engineering
Languages : en
Pages : 396
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Book Description
Damage Modeling of Composite Structures: Strength, Fracture, and Finite Element Analysis provides readers with a fundamental overview of the mechanics of composite materials, along with an outline of an array of modeling and numerical techniques used to analyze damage, failure mechanisms and safety tolerance. Strength prediction and finite element analysis of laminated composite structures are both covered, as are modeling techniques for delaminated composites under compression and shear. Viscoelastic cohesive/friction coupled model and finite element analysis for delamination analysis of composites under shear and for laminates under low-velocity impact are all covered at length. A concluding chapter discusses multiscale damage models and finite element analysis of composite structures. Integrates intralaminar damage and interlaminar delamination under different load patterns, covering intralaminar damage constitutive models, failure criteria, damage evolution laws, and virtual crack closure techniques Discusses numerical techniques for progressive failure analysis and modeling, as well as numerical convergence and mesh sensitivity, thus allowing for more accurate modeling Features models and methods that can be seamlessly extended to analyze failure mechanisms and safety tolerance of composites under more complex loads, and in more extreme environments Demonstrates applications of damage models and numerical methods
Author: Marco Petrolo
Publisher:
ISBN: 9783030119713
Category : Composite materials
Languages : en
Pages : 193
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Book Description
This book gathers contributions addressing issues related to the analysis of composite structures, whose most relevant common thread is augmented numerical efficiency, which is more accurate for given computational costs than existing methods and methodologies. It first presents structural theories to deal with the anisotropy of composites and to embed multifield and nonlinear effects to extend design capabilities and provide methods of augmenting the fidelity of structural theories and lowering computational costs, including the finite element method. The second part of the book focuses on damage analysis; the multiscale and multicomponent nature of composites leads to extremely complex failure mechanisms, and predictive tools require physics-based models to reduce the need for fitting and tuning based on costly and lengthy experiments, and to lower computational costs; furthermore the correct monitoring of in-service damage is decisive in the context of damage tolerance. The third part then presents recent advances in embedding characterization and manufacturing effects in virtual testing. The book summarizes the outcomes of the FULLCOMP (FULLy integrated analysis, design, manufacturing, and health-monitoring of COMPosite structures) research project.
Author: O.O. Ochoa
Publisher: Springer Science & Business Media
ISBN: 9780792311256
Category : Science
Languages : en
Pages : 234
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Book Description
Composite materials are increasingly used in aerospace, underwater, and automotive structures. To take advantage of the full potential of composite materials, structural analysts and designers must have accurate mathematical models and design methods at their disposal. The objective of this monograph is to present the laminated plate theories and their finite element models to study the deformation, strength and failure of composite structures. Emphasis is placed on engineering aspects, such as the analytical descriptions, effective analysis tools, modeling of physical features, and evaluation of approaches used to formulate and predict the response of composite structures. The first chapter presents an overview of the text. Chapter 2 is devoted to the introduction of the definitions and terminology used in composite materials and structures. Anisotropic constitutive relations and Iaminate plate theories are also reviewed. Finite element models of laminated composite plates are presented in Chapter 3. Numerical evaluation of element coefficient matrices, post-computation of strains and stresses, and sample examples of laminated plates in bending and vibration are discussed. Chapter 4 introduces damage and failure criteria in composite laminates. Finally, Chapter 5 is dedicated to case studies involving various aspects and types of composite structures. Joints, cutouts, woven composites, environmental effects, postbuckling response and failure of composite laminates are discussed by considering specific examples.
