Download or read book Progressive Failure Analysis Methodology for Laminated Composite Structures written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A progressive failure analysis method has been developed for predicting the failure of laminated composite structures under geometrically nonlinear deformations. The progressive failure analysis uses C(exp 1) shell elements based on classical lamination theory to calculate the in-plane stresses. Several failure criteria, including the maximum strain criterion, Hashin's criterion, and Christensen's criterion, are used to predict the failure mechanisms and several options are available to degrade the material properties after failures. The progressive failure analysis method is implemented in the COMET finite element analysis code and can predict the damage and response of laminated composite structures from initial loading to final failure. The different failure criteria and material degradation methods are compared and assessed by performing analyses of several laminated composite structures. Results from the progressive failure method indicate good correlation with the existing test data except in structural applications where interlaminar stresses are important which may cause failure mechanisms such as debonding or delaminations.Sleight, David W.Langley Research CenterLAMINATES; FAILURE ANALYSIS; INTERLAMINAR STRESS; STRUCTURAL DESIGN; DEFORMATION; COMPOSITE STRUCTURES; DAMAGE; PREDICTIONS; NONLINEARITY; DELAMINATING; DEBONDING (MATERIALS)
Download or read book Progressive Failure Analysis Methodology for Laminated Composite Structures written by David W. Sleight and published by . This book was released on 1999 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progressive Failure Analysis Methodology for Laminated Composite Structures written by Sleight, David Wayne and published by . This book was released on 1996 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progressive Failure Analysis Methodology For Laminated Composite Structures NASA TP 1999 209107 August 6 1999 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progressive Failure Analysis of Laminated Composite Structures written by Eduardo Moas and published by . This book was released on 1996 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Damage Modeling of Composite Structures written by Pengfei Liu and published by Elsevier. This book was released on 2021-03-09 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Analysis of Composite Laminates written by Dinghe Li and published by Elsevier. This book was released on 2022-03-08 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite Laminated: Theories and Their Applications presents the latest methods for analyzing composite laminates and their applications. The title introduces the most important analytical methods in use today, focusing on fracture, damage, multi-physics and sensitivity analysis. Alongside these methods, it presents original research carried out over two decades on laminated composite structures and gives detailed coverage of laminate theories, analytic solutions and finite element models. Specific chapters cover An introduction to composites, Elasticity, Shear, State space theory, Layerwise theories, The extended layerwise method, Fracture and damage mechanics, Multi-physical fracture problems, Analytical methods of stiffened sandwich structures, Progressive failure analysis, and more. This volume offers a comprehensive guide to the state-of-the-art in the analysis and applications of composite laminates, which play a critical role in all types of engineering, from aerospace to subsea structures, including in medical prosthetics, circuit boards and sports equipment. Presents a guide to the analysis and application of advanced composite materials Gives detailed exposition of plate/shell theories and their implementation in finite element code architecture Considers the robustness, effectiveness and applications aspects of laminated plate/shell methods Gives hands-on experience of code architecture, providing composite analysis software which can be plugged in to commercial applications Presents experimental research alongside methods, laminate theories, analytic solutions, and finite element models
Download or read book A Discrete Modeling Approach for Progressive Failure Analysis of Composite Laminates and Filament wound Pressure Vessels written by Jiakun Liu and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the hi-fidelity finite element (FE) analysis of laminated composite structures. We start with a brief mention of wound composite modeler (WCM), a toolkit for modeling filament-wound composite overwrapped pressure vessels (COPVs). Several simple numerical examples by WCM verify its useful utilities, but also indicate that discrete damage/cracks cannot be properly modeled by homogenized elements. We then attempt to model a tow break with interfacial cracks in a composite overwrap with traditionally used FE methods, but various kinds of erroneous results are observed, showing that the standard interface elements are not capable of modeling interacting cracks. Therefore, we review and discuss some representative methodologies in the literature for modeling discrete damages in composite laminates, and reveal that the current techniques are not capable of explicitly modeling all three types of failure modes and their interactions in laminated composite structures with arbitrary layup angles. In order to overcome the limitations of existing methods, we present an auto-generated geometry-based discrete finite element model (AGDM). This new approach is realized by in-house developed preprocessing commands, and can be adopted for various applications. Then we demonstrate a FE analysis, in which the predicted damage pattern and tensile strengths of the tested specimens are in excellent agreement with X-ray and data from experimental observations. Finally, we investigate the overload profile around an in-situ tow break in COPVs. Some analytical formulas to evaluate stress concentration factors (SCF) are provided, which are derived from a shear-lag based analysis and stress fields under a point load applied on the surface of a transversely isotropic elastic half-space. Then several FE analysis made possible by AGDM are also presented.
Download or read book Finite Element Analysis of Composite Laminates written by O.O. Ochoa and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Damage Modeling of Composite Structures written by Pengfei Liu and published by Elsevier. This book was released on 2021-03-10 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Course On Emerging Techniques For Damage Prediction And Failure Analysis Of Laminated Composite Structures written by Éditions Cépaduès and published by Éditions Cépaduès. This book was released on 2008-01-08 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The course deals with the crucial central question: how can one predict the evolution of damage up to and including final fracture ?Emerging yet mature answers will be presented. First, a description of today's common approaches in industrial environments will be given, along with their limits regarding the design and calculation of stratified composite structures. The course also emphasizes the damage mesomodel initiated at LMT-Cachan and used today in a number of calculation codes. This advanced yet pragmatic tool for the prediction of damage in stratified materials has become mature thanks particularly to the works of LMT-Cachan on its relation to micromechanics, EADS-Innovation Works on its identification, and DLR on its application to impact and crash problems. The course aims to give engineers and researchers the most complete view possible of the state-of-the-art and emerging techniques in damage prediction and failure analysis of laminated composite structures.
Download or read book Advanced Techniques for Constituent based Progressive Failure Analysis of Composite Structures written by Douglas J. Kenik and published by . This book was released on 2009 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progressive failure analysis of composite structures is an extremely challenging problem demanding numerical efficiency while transcending geometric length scales extending over several orders of magnitude. These two attributes place fundamentally opposite demands on the development of such analyses. The premise of this thesis was to investigate and implement pragmatic numerical techniques to enhance progressive failure analysis of composite structures with particular attention paid to addressing the impact of thermomechanical loads that may arise in structural problems. A hexagonally packed micromechanics model was implemented with an in-house finite element code, and optimized for speed, to allow macroscopic material property calculation on the order of milliseconds. Solution speeds were reduced by three orders of magnitude over previous models. Linear elastic micromechanics modeling capabilities were then extended to allow for time and temperature dependent material properties through a viscoelastic material model. A typical cure cycle for a glass/epoxy and carbon/epoxy composite was modeled. The constituent stresses generated during the cure cycle were then used to conduct a detailed analysis on the effects of residual stresses from cure cycles on lamina failure predictions at room temperature. It was found that the effects of thermal residual stresses from a cure cycle are negligible for room temperature failure predictions of unidirectional composite materials. A detailed analysis of cryogenic failure predictions was also conducted for unidirectional laminae and multidirectional laminates. It was found that cryogenic thermal loadings have a pronounced effect on failure predictions for both unidirectional laminae and multidirectional laminates. Finally, an orthotropic degradation scheme was used to simulate transverse matrix cracking in multidirectional laminates. A series of progressive failure predictions were modeled and compared to experimental data to show that orthotropic degradation of the matrix material under transverse loadings predicts the progression of failure in good agreement with experimental data.
Download or read book Modeling the Progressive Failure of Laminated Composites with Continuum Damage Mechanics written by DC. Lo and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuum-damage-mechanics-based model is proposed for the analysis of the progressive failure process in laminated composite structures. The laminate's response is determined by nonlinear constitutive equations that account for each type of matrix-dominated damage through strain-like internal state variables. Evolution of these internal state variables is governed by the damage-dependent ply-level stresses. The updated damage state and the ply-level stresses are then employed in the local-global evaluation of component failure. This model is incorporated into a finite-element analysis code to facilitate the examination of structures with spatially varying stress fields. The stress and damage distribution obtained from the analysis at various points in the loading history provide information about the progression of events leading to the failure of the component. The progressive failure of fatigue-loaded rectangular crossply-laminated plates containing a centered circular cutout has been examined with the model. Most of the predicted damage is localized in a region near the cutout. Rather than propagating outward, the damage intensifies in this region until failure occurs. The feasibility of modeling the evolution of each type of subcritical damage is demonstrated with the current framework. This ability to simulate the progressive failure process at this level of detail will assist in the design of safer and more efficient composite structures.
Download or read book Defects and Damage in Composite Materials and Structures written by Rikard Benton Heslehurst and published by CRC Press. This book was released on 2014-04-21 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advantages of composite materials include a high specific strength and stiffness, formability, and a comparative resistance to fatigue cracking and corrosion. However, not forsaking these advantages, composite materials are prone to a wide range of defects and damage that can significantly reduce the residual strength and stiffness of a structu
Download or read book Stress Concentrations in Laminated Composites written by Seng C. Tan and published by Routledge. This book was released on 2017-10-19 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Uncertainty Quantification in Laminated Composites written by Sudip Dey and published by CRC Press. This book was released on 2018-09-19 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few decades, uncertainty quantification in composite materials and structures has gained a lot of attention from the research community as a result of industrial requirements. This book presents computationally efficient uncertainty quantification schemes following meta-model-based approaches for stochasticity in material and geometric parameters of laminated composite structures. Several metamodels have been studied and comparative results have been presented for different static and dynamic responses. Results for sensitivity analyses are provided for a comprehensive coverage of the relative importance of different material and geometric parameters in the global structural responses.
Download or read book Damage and Failure of Composite Materials written by Ramesh Talreja and published by Cambridge University Press. This book was released on 2012-06-07 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bringing together materials mechanics and modelling, this book provides a complete guide to damage mechanics of composite materials for engineers.
