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Understanding And Predicting The Stress Relaxation Behavior Of Short Fiber Composites
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Book Synopsis Understanding and Predicting the Stress Relaxation Behavior of Short-Fiber Composites by : Numaira Obaid
Download or read book Understanding and Predicting the Stress Relaxation Behavior of Short-Fiber Composites written by Numaira Obaid and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The viscoelastic properties of short-fiber composites are complex and not well-understood. Previous experimental work has shown that the viscoelastic properties of short-fiber composites are affected by both elastic fibers and the matrix, which is baffling since elastic fibers do not exhibit any time-dependence of their own. The goal of this study was to understand why and how elastic fibers can alter time-dependent behavior when contained in a composite. In this thesis, conventional shear-lag theory was adapted to include a time-dependent matrix and a novel analytical model was used to predict the tensile relaxation modulus of short-fiber composites. The model highlighted the importance of incorporating both the time-dependent tensile modulus of the matrix as well as its time-dependent shear modulus. Investigations using the model showed that since stress transfer in a short-fiber composite occurs through interfacial shearing, the time-dependent shear modulus of the matrix results in time-varying stress transfer the fiber. Since the stress in the fiber is time-dependent, it exhibits an apparent stress relaxation stemming from the relaxing shear modulus of the matrix. The model predictions were validated using finite-element simulations and experimental data. Comparison to real data confirmed the hypothesis that the time-dependency observed in elastic fibers stemmed from the indirect time-dependency imposed by the time-varying stress transfer from the matrix. The model was also used to determine the effect of various parameters including fiber aspect ratio and fiber volume fraction. For the first time, a critical aspect ratio for viscoelasticity was introduced. This was defined as the aspect ratio at which the contribution to composite stress relaxation by the fiber is maximized. The effect of fiber orientation was also examined, and an analytical model was developed to predict the stress relaxation of composites containing randomly-oriented fibers. It was found that random orientation in the plane would shrink the effect of fibers by one-third of what would be observed in oriented composites. In the last part of the thesis, we investigated the strain rate-dependence of short fiber-reinforced foams. The study highlighted a potential area where knowledge of the stress relaxation behavior of the short-fiber composites could prove useful.
Book Synopsis Elastomeric Nanocellulose Composites by : Sabu Thomas
Download or read book Elastomeric Nanocellulose Composites written by Sabu Thomas and published by Elsevier. This book was released on 2024-01-16 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elastomeric Nanocellulose Composites provides an in-depth study of recent developments in this fast-evolving research field. This book covers diverse aspects of materials engineering, surface treatments, and fabrication of green nanocomposites. It consolidates recent studies and qualitative findings on the incorporation of a myriad of nanocellulose variants into various types of elastomer matrices with the main goal of enhancing its mechanical integrity and potentially phasing out conventional elastomer fillers. The current market is likewise discussed in detail. This book will provide an in-depth study of current developments of nanocellulose incorporated elastomer composites and their applications. The book will be an essential reference resource for material scientists, academic and industrial researchers, and technologists covering all aspects in the field. Carbon black and silica are currently used as fillers in elastomer-based composites, but the use of these reinforcing agents is not sustainable or eco-friendly. Therefore there is a need to look for more sustainable filler materials for elastomers. Assists readers in solving fundamental and application-related problems in the development of nanocellulose filled elastomers Discusses characterization techniques used for analyzing elastomer nanocomposites Provides various attributes of nanocellulose, its composites with different types of elastomeric materials (both natural and synthetic) and its potential for advanced applications Includes comprehensive, well structured content to maintain consistency and flow to help readers easily navigate chapters
Book Synopsis Stress Relaxation Behavior of Carbon Fiber-epoxy Prepreg Composites During and After Cure by : Rony Das
Download or read book Stress Relaxation Behavior of Carbon Fiber-epoxy Prepreg Composites During and After Cure written by Rony Das and published by . This book was released on 2012 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents the experimental results of time-temperature dependent viscoelastic behavior and cure kinetics of two commercial carbon fiber/epoxy prepregs, IM7/977-2 unidirectional tape (UD) and IM7/977-2 plain weave fabric (PW). An in-depth study on the oscillatory and transient rheological behavior of prepreg composites is conducted using a dynamic mechanical analyzer (DMA) and the study of cure kinetics is conducted using a differential scanning calorimeter (DSC). A novel experimental methodology is proposed in this study to describe the stress relaxation behavior of prepreg composites during cure. Time- and cure-dependent stress relaxation behavior of prepreg composites is studied in three in-plane directions: 0, 45, and 90 degrees of the laminates. Several other factors, such as the mismatch of fiber orientation of adjoining plies, stacking sequence of the laminate, and relative position of the plies with respect to the neutral axis are considered to study their effects on the stress relaxation behavior during cure. The stress relaxation behavior of cured composites is obtained by utilizing the time-temperature superposition (TTS) principle. TTS study on UD laminates (in 0, 45, and 90 degree fiber directions) is conducted at four distinct cure states, whereas the PW laminate is studied in the same fiber directions but at a fully cured state only. Experimental results are used to predict the life cycle of the composite products by generating the stress relaxation master curves for different combinations of fiber orientation and cure states. The study shows that the relaxation modulus during cure is case dependent, which leads to the assumption that the relaxation of process-induced stresses during cure varies for different conditions. Moreover, when comparing the performance of UD and PW prepregs, it shows that the PW laminate relaxes more residual stress than the UD laminate during cure. At cured condition, the PW material shows better long-term mechanical performance than UD material.
Book Synopsis Dynamic Mechanical and Creep-Recovery Behavior of Polymer-Based Composites by : Akarsh Verma
Download or read book Dynamic Mechanical and Creep-Recovery Behavior of Polymer-Based Composites written by Akarsh Verma and published by Elsevier. This book was released on 2024-01-19 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Mechanical and Creep-Recovery Behaviour of Polymer-Based Composites: Mechanical and Mathematical Modeling covers mathematical modelling, dynamic mechanical analysis, and the ways in which various factors impact the creep-recovery behaviour of polymer composites. The effects of polymer molecular weight, plasticizers, cross-linking agents, and chemical treatment of filler material are addressed and information on thermoplastic and thermosetting polymer-based composites is also covered, including their various applications and the advantages and disadvantages of their use in different settings. The final 2 chapters of the book cover mathematical modeling of creep-recovery behavior for polymer composites and software-based simulation of creep-recovery in polymer composites, respectively. Dynamic Mechanical and Creep-Recovery Behaviour of Polymer-Based Composites: Mechanical and Mathematical Modeling covers mathematical modelling, dynamic mechanical analysis, and the ways in which various factors impact the creep-recovery behaviour of polymer composites. The effects of polymer molecular weight, plasticizers, cross-linking agents, and chemical treatment of filler material are addressed and information on thermoplastic and thermosetting polymer-based composites is also covered, including their various applications and the advantages and disadvantages of their use in different settings. The final 2 chapters of the book cover mathematical modeling of creep-recovery behavior for polymer composites and software-based simulation of creep-recovery in polymer composites, respectively. Analyzes the dynamic mechanical and creep-recovery behaviors of thermoplastic and thermosetting polymer composites in a variety of applications Features diverse mechanical/mathematical models utilized to fit data collected from creep-recovery studies Covers various factors that influence dynamic mechanical properties Discusses the advantages and disadvantages of using these materials in different settings
Book Synopsis Delaware Composites Design Encyc by : University of Delawa
Download or read book Delaware Composites Design Encyc written by University of Delawa and published by CRC Press. This book was released on 1990-03-28 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Anisotropic Elasticity - Special Applications: Mechanics of Anisotropic Materials - Micromodels for Continuous Fiber Composites - Micromodels for Particulate/Discontinuous Fiber Composites - Introduction to Viscoelasticity - Micromodels for Predicting Viscoelastic Behavior - Transport Properties
Book Synopsis Analysis and Performance of Fiber Composites by : Bhagwan D. Agarwal
Download or read book Analysis and Performance of Fiber Composites written by Bhagwan D. Agarwal and published by Wiley-Interscience. This book was released on 1990-10-08 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Having fully established themselves as workable engineering materials, composite materials are now increasingly commonplace around the world. Serves as both a text and reference guide to the behavior of composite materials in different engineering applications. Revised for this Second Edition, the text includes a general discussion of composites as material, practical aspects of design and performance, and further analysis that will be helpful to those engaged in research on composites. Each chapter closes with references for further reading and a set of problems that will be useful in developing a better understanding of the subject.
Book Synopsis Stress-strain Curve Prediction of Short Fiber-reinforced Composites and Bio-inspired Layered Structural Composites Using Deep Neural Networks by : 蔡孟霖
Download or read book Stress-strain Curve Prediction of Short Fiber-reinforced Composites and Bio-inspired Layered Structural Composites Using Deep Neural Networks written by 蔡孟霖 and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stress Relaxation in Polymer Matrix Composites by : Lich Thanh Tran
Download or read book Stress Relaxation in Polymer Matrix Composites written by Lich Thanh Tran and published by . This book was released on 1996 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Science and Engineering of Short Fibre Reinforced Polymer Composites by : S. Y. Yu
Download or read book Science and Engineering of Short Fibre Reinforced Polymer Composites written by S. Y. Yu and published by CRC Press. This book was released on 2009-08-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of recent research on short fiber reinforced polymers, this book focuses on the fundamental mechanisms that govern the mechanical properties including strength, modulus, fracture toughness and thermal properties of SFRP materials. It covers extrusion compounding and injection molding, major factors affecting mechanical performance, stress transfer, strength, elastic modulus flexural modulus, thermal conductivity and expansion, non-linear stress-strain behavior and fracture mechanics of short fiber reinforced polymers. Written by a team of distinguished authors, it provides an in-depth understanding of the behavior of these versatile materials.
Book Synopsis Advances in Understanding Thermal Effects in Rubber by : Gert Heinrich
Download or read book Advances in Understanding Thermal Effects in Rubber written by Gert Heinrich and published by Springer Nature. This book was released on with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1970 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanics Of Composite Materials by : Robert M. Jones
Download or read book Mechanics Of Composite Materials written by Robert M. Jones and published by CRC Press. This book was released on 2018-10-08 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book balances introduction to the basic concepts of the mechanical behavior of composite materials and laminated composite structures. It covers topics from micromechanics and macromechanics to lamination theory and plate bending, buckling, and vibration, clarifying the physical significance of composite materials. In addition to the materials covered in the first edition, this book includes more theory-experiment comparisons and updated information on the design of composite materials.
Book Synopsis Fatigue Life Prediction of Composites and Composite Structures by : Anastasios P. Vassilopoulos
Download or read book Fatigue Life Prediction of Composites and Composite Structures written by Anastasios P. Vassilopoulos and published by Woodhead Publishing. This book was released on 2019-10-08 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue Life Prediction of Composites and Composite Structures, Second Edition, is a comprehensive review of fatigue damage and fatigue life modeling and prediction methodologies for composites and their use in practice. In this new edition, existing chapters are fully updated, while new chapters are introduced to cover the most recent developments in the field. The use of composites is growing in structural applications in many industries, including aerospace, marine, wind turbine and civil engineering. However, there are uncertainties about their long-term performance, including performance issues relating to cyclic fatigue loading that hinder the adoption of a commonly accepted credible fatigue design methodology for the life prediction of composite engineering structures. With its distinguished editor and international team of contributors, this book is a standard reference for industry professionals and researchers alike. Examines past, present and future trends associated with the fatigue life prediction of composite materials and structures Assesses novel computational methods for fatigue life modeling and prediction of composite materials under constant amplitude loading Covers a wide range of techniques for predicting fatigue, including their theoretical background and practical applications Addresses new topics and covers contemporary research developments in the field
Book Synopsis Principles of Composite Material Mechanics, Second Edition by : Ronald F. Gibson
Download or read book Principles of Composite Material Mechanics, Second Edition written by Ronald F. Gibson and published by CRC Press. This book was released on 2007-05-30 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensively updated and maintaining the high standard of the popular original, Principles of Composite Material Mechanics, Second Edition reflects many of the recent developments in the mechanics of composite materials. It draws on the decades of teaching and research experience of the author and the course material of the senior undergraduate and graduate level classes he has taught. New and up-to-date information throughout the text brings modern engineering students everything they need to advance their knowledge of the evermore common composite materials. The introduction strengthens the book’s emphasis on basic principles of mechanics by adding a review of the basic mechanics of materials equations. New appendices cover the derivations of stress equilibrium equations and the strain–displacement relations from elasticity theory. Additional sections address recent applications of composite mechanics to nanocomposites, composite grid structures, and composite sandwich structures. More detailed discussion of elasticity and finite element models have been included along with results from the recent World Wide Failure Exercise. The author takes a phenomenological approach to illustrate linear viscoelastic behavior of composites. Updated information on the nature of fracture and composite testing includes coverage of the finite element implementation of the Virtual Crack Closure technique and new and revised ASTM standard test methods. The author includes updated and expanded material property tables, many more example problems and homework exercises, as well as new reference citings throughout the text. Requiring a solid foundation in materials mechanics, engineering, linear algebra, and differential equations, Principles of Composite Materials Mechanics, Second Edition provides the advanced knowledge in composite materials needed by today’s materials scientists and engineers.
Book Synopsis In Situ Monitoring of Fiber-Reinforced Composites by : Markus G.R. Sause
Download or read book In Situ Monitoring of Fiber-Reinforced Composites written by Markus G.R. Sause and published by Springer. This book was released on 2016-06-14 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: “...a comprehensive and well written book, which...will be useful reading for both researchers entering the field and experienced specialists looking for new ideas....a valuable and long-lasting contribution to experimental mechanics.” – Stepan Lomov, KU Leuven This expert volume, an enhanced Habilitation thesis by the head of the Materials Testing Research Group at the University of Augsburg, provides detailed coverage of a range of inspection methods for insitu characterization of fiber-reinforced composites. The failure behavior of fiber reinforced composites is a complex evolution of microscopic damage phenomena. Beyond the use of classical testing methods, the ability to monitor the progression of damage insitu offers new ways to interpret the materials failure modes. Methods covered include digital image correlation, acoustic emission, electromagnetic emission, computed tomography, thermography, shearography, and promising method combinations. For each method, the discussion includes operational principles and practical applications for quality control as well as thoughtful assessment of the method's strengths and weakness so that the reader is equipped to decide which method or methods are most appropriate in a given situation. The book includes extensive appendices covering common experimental parameters influencing comparability of acoustic emission measurements; materials properties for modeling; and an overview of terms and abbreviations.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predictions of Monotonic Tensile Stress-strain Curves of Short Fiber Reinforced Polymer Composites by : Che-Yang Chen
Download or read book Predictions of Monotonic Tensile Stress-strain Curves of Short Fiber Reinforced Polymer Composites written by Che-Yang Chen and published by . This book was released on 1984 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
