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Failure Mechanisms Of Notched Laminated Composites Under Compressive Loading At Room And Elevated Temperature
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Book Synopsis Failure Mechanisms of Notched Laminated Composites Under Compressive Loading at Room and Elevated Temperature by : Jung Hyun Ahn
Download or read book Failure Mechanisms of Notched Laminated Composites Under Compressive Loading at Room and Elevated Temperature written by Jung Hyun Ahn and published by . This book was released on 1999 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Failure Criteria for Composites by :
Download or read book Failure Criteria for Composites written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the mechanisms of failure of composite structures and developing mechanism based failure criteria are important considerations in designing structures made of composite materials. The compressive response of composite materials has received considerable attention due to their significance in the aerospace industry and the complexity associated with compressive failure. Several competing failure mechanisms such as fiber/matrix interfacial failure, fiber microbuckling/kinking, delamination initiation and delamination buckling may become active in compressive loading. Environmental effects such as an elevated temperature can alter and affect these failure mechanisms. In this project, a micromechanics based predictive model for the notched strength of multidirectional laminates is presented and implemented via the finite element method. Experimental results to verify/refute this model are presented at both room and elevated temperature. The in-situ shear response of the matrix, the fiber mechanical properties, the laminate lay-up and fiber volume fraction serve as input to the model. The predictions of the model are found to match favorably with experimental data. The effect of ply angle and its influence on the failure mechanism are quantified and compared with available experimental data. This work is the first development of a non-empirical mechanics based failure prediction methodology for notched strength of composite laminates.
Book Synopsis Research Study to Define the Critical Failure Mechanisms in Notched Composites Under Compression Fatigue Loading by : B. W. Rosen
Download or read book Research Study to Define the Critical Failure Mechanisms in Notched Composites Under Compression Fatigue Loading written by B. W. Rosen and published by . This book was released on 1981 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytical and experimental studies of identify the dominant failure mechanisms for compression fatigue of notched composite laminates have been conducted. The effects of stacking sequence and matrix material on damage growth as well as failure mechanisms under compression fatigue loading are reported. Two types of resin materials and four kinds of laminate layups have been considered. Two of the stacking sequences are fiber dominated and two are quasi-isotropic. Ultrasonic C-scans and photomicrographic studies have been utilized for experimental observations. An analytical methodology developed for the study of tension fatigue of notched laminates has been modified to obtain patterns of damage growth under quasi-static load by increasing it gradually in steps. For each step increase in load, a finite element stress analysis is performed and intralaminar and/or interlaminar failures in the elements are predicted.
Book Synopsis Stress Concentrations in Laminated Composites by : Seng C. Tan
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 486 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.
Book Synopsis Fiber, Matrix, and Interface Properties by : Christopher J. Spragg
Download or read book Fiber, Matrix, and Interface Properties written by Christopher J. Spragg and published by ASTM International. This book was released on 1996 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emphasizing fiber-matrix adhesion and its characterization in composite materials, reports results from applying the most commonly used test methods, such as fragmentation, pull-out, and indentation, to high-performance composites and their constituents. The 13 papers were presented at a symposium i
Book Synopsis Analysis of Compressive Behaviour in Fibre Direction of Laminated Composite Structures in Presence of Matrix Degradation and Stress Concentrations by : Aldo Cocchi
Download or read book Analysis of Compressive Behaviour in Fibre Direction of Laminated Composite Structures in Presence of Matrix Degradation and Stress Concentrations written by Aldo Cocchi and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determination of compressive properties at failure is an important factor for the design of composite structures. In this work, an analysis concerning the compression strength in fibre direction of composite structures is presented. A novel specimen geometry is proposed with the aim to obtain failure in a valid zone of the coupon free of stress concentrations. Experimental tests permitted to validate the usage of the new coupon in compression and four-points bending, at room and elevated temperature. Further tests permitted to study the influence of matrix degradation on compressive strength in fibre direction. Experimental results demonstrated different behaviours for carbon and glass reinforced plastics. A non-local failure criterion was utilized to predict the strength of composite structures with stress concentrations in tension and compression. The identified parameters were validated on coupons presenting size effects. The failure mechanisms of particular laminates in static and fatigue tension (ex. quasi-isotropic) where analyzed. Delamination can be the cause of these failures, in particular for UD plies and brittle matrices. In other cases, failure can be explained by compression failure in fibre direction generated by Poisson effect and favoured by matrix degradation. This failure mechanism permitted to model the experimental results in fatigue loading for quasi-isotropic laminates fabricated with a balanced carbon/PEEK woven ply. Finally the influence of matrix damage on the characteristic length of the non-local failure criterion was assessed on pre-damaged coupons with stress concentrations.
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2003 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Damage Accumulation and Fracture of Notched Composite Laminates Under Tensile and Compressive Loading by : RY. Kim
Download or read book Damage Accumulation and Fracture of Notched Composite Laminates Under Tensile and Compressive Loading written by RY. Kim and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Damage accumulations before ultimate failure in laminated composites containing an open hole were studied and compared under tensile and compressive loadings. Four laminate layups, [02/± 45]2s, [0/90/ ± 45]2s, [ ± 45]4s, and [ ± 30/ ± 60]2s, were selected for the investigation. Two sets of laminates were prepared with one loaded in tension and another loaded in compression. They were examined using X-ray techniques after being loaded to specific load levels.
Book Synopsis Strength and Failure Analysis of Composite Laminates with Holes at Room and Elevated Temperatures by : B. U. Malik
Download or read book Strength and Failure Analysis of Composite Laminates with Holes at Room and Elevated Temperatures written by B. U. Malik and published by . This book was released on 1984 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: The composite material community has been interested in developing a matrix fiber combination which could improve the ability of a laminate in resisting interlaminate fracture impact loading to a greater degree than in the past and ultimately, improve upon the toughness of the composite material. Recently, a matrix has been manufactured that appears to assist in obtaining these goals. This material is a thermoplastic resin referred to as polyetheretherkeytone (Peek). A review of literature produced very little information related to Gr/Peek. Thus an experimental study reported here-in was conducted to investigate the high temperature strength (tension and compression) of Gr/Peek and Gr/Epoxy laminates with holes. The results were then used to determine the parameters necessary to predict trends incorporating the point stress, average stress failure criteria and the three parameter curve fir criterion. The comparison of predicted and experimental failure stress are shown graphically. The failure modes of Gr/Peek and Gr/Ep are analyzed with the help of electron scanning micrographs. It is seen that an interface degradation exists for Gr/Peek (Polyetheretherkeytone) at higher temperatures. An effect of shear crippling similar to that of Gr/Ep is observed in compression failure of Gr/Peek. Originator-supplied keywords include: Composite Materials, Notch Sensitivity, Fracture ((Mechanics), GR(Graphite), Strength (Mechanics), Theses.
Book Synopsis Defects and Damage in Composite Materials and Structures by : Rikard Benton Heslehurst
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 216 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 structure or result in unfavorable load paths. Emphasizing defect identification and restitution, Defects and Damage in Composite Materials and Structures explains how defects and damage in composite materials and structures impact composite component performance. Providing ready access to an extensive, descriptive list of defects and damage types, this must-have reference: Examines defect criticality in composite structures Recommends repair actions to restore structural integrity Discusses failure modes and mechanisms of composites due to defects Reviews NDI processes for finding and identifying defects in composite materials Relating defect detection methods to defect type, the author merges his experience in the field of in-service activities for composite airframe maintenance and repair with indispensable reports and articles on defects and damage in advanced composite materials from the last 50 years.
Book Synopsis Woven Fabric Composites by : Niranjan K. Naik
Download or read book Woven Fabric Composites written by Niranjan K. Naik and published by CRC Press. This book was released on 1993-11-27 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is presented as an analytical methodology developed to study the thermo-elastic behavior of woven fabric composites. Also, experimental studies on the failure behavior of woven fabric composites are presented.
Book Synopsis Tensile and Compressive Failure Modes of Laminated Composites Loaded by Fatigue with Different Mean Stress by : A. Rotem
Download or read book Tensile and Compressive Failure Modes of Laminated Composites Loaded by Fatigue with Different Mean Stress written by A. Rotem and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminated composite materials tend to fail differently under tensile or compressive load. Under tension, the material accumulates cracks and fiber fractures, while under compression, the material delaminates and buckles. Tensile-compressive fatigue may cause either of these failure modes depending on the specific damage occurring in the laminate. This damage depends on the stress ratio of the fatigue loading. Analysis of the fatigue behavior of the composite laminate under tension-tension, compression-compression, and tension-compression had led to the development of a fatigue envelope presentation of the failure behavior. This envelope indicates the specific failure mode for any stress ratio and number of loading cycles. The construction of the fatigue envelope is based on the applied stress-cycles to failure (S-N) curves of both tensile-tensile and compressive-compressive fatigue. Test results are presented to verify the theoretical analysis.
Book Synopsis Modeling Damage, Fatigue and Failure of Composite Materials by : Ramesh Talreja
Download or read book Modeling Damage, Fatigue and Failure of Composite Materials written by Ramesh Talreja and published by Elsevier. This book was released on 2023-09-29 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling Damage, Fatigue and Failure of Composite Materials, Second Edition provides the latest research in the field of composite materials, an area that has attracted a wealth of research, with significant interest in the areas of damage, fatigue, and failure. The book is fully updated, and is a comprehensive source of physics-based models for the analysis of progressive and critical failure phenomena in composite materials. It focuses on materials modeling while also reviewing treatments for analyzing failure in composite structures. Sections review damage development in composite materials such as generic damage and damage accumulation in textile composites and under multiaxial loading. Part Two focuses on the modeling of failure mechanisms in composite materials, with attention given to fiber/matrix cracking and debonding, compression failure, and delamination fracture. Final sections examine the modeling of damage and materials response in composite materials, including micro-level and multi-scale approaches, the failure analysis of composite materials and joints, and the applications of predictive failure models. Provides a comprehensive source of physics-based models for the analysis of progressive and critical failure phenomena in composite materials Assesses failure and life prediction in composite materials Discusses the applications of predictive failure models such as computational approaches to failure analysis Covers further developments in computational analyses and experimental techniques, along with new applications in aerospace, automotive, and energy (wind turbine blades) fields Covers delamination and thermoplastic-based composites
Book Synopsis Failure Mechanisms of Laminated Carbon-carbon Composites Under Compressive and Shear Loads by : Kamal Anand
Download or read book Failure Mechanisms of Laminated Carbon-carbon Composites Under Compressive and Shear Loads written by Kamal Anand and published by . This book was released on 1994 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Failure in Composites by : Anthony M. Waas
Download or read book Failure in Composites written by Anthony M. Waas and published by DEStech Publications, Inc. This book was released on 2013 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth volume of the ASC series on advanced composites contains critical information on static and dynamic composite failure and how it is predicted and modeled using novel computational methods and micromechanical analysis.
Book Synopsis Compressive Failure of Laminated and Woven Composites by : NA. Fleck
Download or read book Compressive Failure of Laminated and Woven Composites written by NA. Fleck and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of fiber architecture upon the compressive failure mechanisms is investigated for a wide range of fiber composites. Compressive tests are performed on both notched and unnotched specimens made from T800 carbon fiber-924C epoxy laminates, AS4 carbon fiber-PEEK laminates, 2D woven T800 carbon fiber-924 epoxy, and 3D woven AS4 carbon fiber-LY564 epoxy. Additionally, unnotched and notched compressive tests are performed on beechwood and birch plywood. In all cases, the dominant failure mechanism is by fiber microbuckling. An infinite band kinking model is used to estimate the unnotched strength and a large-scale crack bridging analysis is used to predict the notched strength.
