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Self Sensing Of Strain And Damage In Carbon Epoxy Rectangular Coupons And I Beams Under Flexural Loading Using The Electrical Resistance Method
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Book Synopsis Self-sensing of Strain and Damage in Carbon/epoxy Rectangular Coupons and I-beams Under Flexural Loading Using the Electrical Resistance Method by : Manoj Brian Pinto
Download or read book Self-sensing of Strain and Damage in Carbon/epoxy Rectangular Coupons and I-beams Under Flexural Loading Using the Electrical Resistance Method written by Manoj Brian Pinto and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The strain and damage sensing capabilities of a carbon fiber/epoxy composite subjected to monotonic and incremental cyclic flexural loading is investigated using the electrical resistance approach. The piezoresistive sensitivity of the carbon fiber/epoxy composites were first characterized using rectangular cross-section specimens. Then, application of the electrical resistance approach was extended to an I-shaped cross-section laminated composite under pure bending and then cantilever flexural loading. The change in the electrical resistance of the specimens was simultaneously monitored on both the tensile and compressive sides, while the specimens were tested under flexural loading. On the tensile side, the positive electrical resistance change showed a linear trend for small deformations (less than 0.3% strain) and increased in a nonlinear fashion for larger deformations. In contrast to the tensile side, the electrical resistance change on the compressive side showed a nonlinear and non-monotonic behavior. Initially, electrical resistance changes decreased for low values of deformation (less than 0.3% strain), leveled off at the onset of the specimen's compressive failure, and then increased up to complete failure. Correlations between abrupt changes in electrical resistance change and indications of composite damage are confirmed with scanning electron microscopy. Carbon fibers in both rectangular and I-shaped cross-section carbon/epoxy specimens are capable of sensing tensile and compressive strain, and adequately capture the onset and progression of failure by fiber micro-buckling, formation of kink bands, and delamination. The cross-section properties (e.g. stiffness and layup sequence) affect the piezoresistive and damage sensitivity, with the stiffer I-shaped cross-section being less sensitive to than standard specimens of rectangular cross-section. Electrical resistance changes under cyclic flexural loading for both tensile and compressive sides showed a permanent change with applied deformation after each cycle indicating first the release of residual stresses and then damage. The response of the I-shaped beam tested under pure bending is shown to correspond to the same electromechanical response under cantilever flexural loading.
Book Synopsis Self-sensing of Impact Damage in Carbon Fiber Cement Mortar by : David Meehan
Download or read book Self-sensing of Impact Damage in Carbon Fiber Cement Mortar written by David Meehan and published by . This book was released on 2009 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Damage monitoring of the civil infrastructure is of critical national importance. Cement mortar containing short carbon fiber and silica fume has been found to be effective for sensing its own impact damage through the effect of impact on the DC or AC electrical resistance, provided that the region of resistance measurement contains the point of impact. The carbon fiber mortar may be in bulk form or the form of a coating of thickness as small as 5 mm. The carbon fiber can be made from pitch or PAN, provided that the resistivity of the mortar is in the range 104 - 105 Ohm.cm, as provided by pitch-based carbon fiber (15 micrometer diameter, 5 mm long, unsized) at 0.5% or 1.0% by mass of cement or by type A PAN-based carbon fiber (7 micrometer diameter, 8 mm long, desized) at 0.5% by mass of cement.^Due to the low mortar resistivity of 103 Ohm.cm, pitch-based carbon fiber at 1.5% by mass of cement and type B PAN-based carbon fiber (7 micrometer diameter, 8 mm long, unsized) at 0.5% by mass of cement are less effective. In the absence of fiber, there is no sensing ability. The surface resistance measured at the surface receiving the impact is a particularly effective indicator of the impact damage, as shown for impact energy 880-3990 J. Due to 2660 J impact, for example, the flexural strength decrease is 20%, the flexural toughness decrease is 81% and the indent depth is 64 micrometer, with no visible cracks, as shown for pitch-based carbon fiber. The four-probe method gives higher fractional increase in the surface resistance upon damage than the two-probe method. The oblique resistance and the longitudinal volume resistance are much less effective.^The surface resistance increases abruptly upon impact, though it decreases abruptly upon impact after a sufficient number (5-40) of impacts have been inflicted. The higher is the impact energy, the smaller is the number of impacts needed to change from the abrupt increase behavior to the abrupt decrease behavior. The abrupt increase is due to defect generation and the consequent increase in resistivity (1800% increase at 2660 J) of the region being damage. On the other hand, the abrupt decrease is due to the subtle damage of the cement matrix between adjacent fibers and the consequent increase in the degree of fiber-fiber contact and decrease in the resistivity, as previously reported for fatigue damage. When the impact energy is higher than that of prior impacts, the impact damage sensitivity is better than the case of the impact energy being lower than that of prior impacts.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1994 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Health Monitoring of Aerospace Composites by : Victor Giurgiutiu
Download or read book Structural Health Monitoring of Aerospace Composites written by Victor Giurgiutiu and published by Academic Press. This book was released on 2015-09-08 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Health Monitoring of Aerospace Composite Structures offers a comprehensive review of established and promising technologies under development in the emerging area of structural health monitoring (SHM) of aerospace composite structures. Beginning with a description of the different types of composite damage, which differ fundamentally from the damage states encountered in metallic airframes, the book moves on to describe the SHM methods and sensors currently under consideration before considering application examples related to specific composites, SHM sensors, and detection methods. Expert author Victor Giurgiutiu closes with a valuable discussion of the advantages and limitations of various sensors and methods, helping you to make informed choices in your structure research and development. The first comprehensive review of one of the most ardent research areas in aerospace structures, providing breadth and detail to bring engineers and researchers up to speed on this rapidly developing field Covers the main classes of SHM sensors, including fiber optic sensors, piezoelectric wafer active sensors, electrical properties sensors and conventional resistance strain gauges, and considers their applications and limitation Includes details of active approaches, including acousto-ultrasonics, vibration, frequency transfer function, guided-wave tomography, phased arrays, and electrochemical impedance spectroscopy (ECIS), among other emerging methods
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.
Download or read book Smart Composites written by Rani Elhajjar and published by CRC Press. This book was released on 2013-12-14 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart Composites: Mechanics and Design addresses the current progress in the mechanics and design of smart composites and multifunctional structures. Divided into three parts, it covers characterization of properties, analyses, and design of various advanced composite material systems with an emphasis on the coupled mechanical and non-mechanical behaviors. Part one includes analyses of smart materials related to electrically conductive, magnetostrictive nanocomposites and design of active fiber composites. These discussions include several techniques and challenges in manufacturing smart composites and characterizing coupled properties, as well as the analyses of composite structures at various length and time scales undergoing coupled mechanical and non-mechanical stimuli considering elastic, viscoelastic (and/or viscoplastic), fatigue, and damage behaviors. Part two is dedicated to a higher-scale analysis of smart structures with topics such as piezoelectrically actuated bistable composites, wing morphing design using macrofiber composites, and multifunctional layered composite beams. The analytical expressions for characterization of the smart structures are presented with an attention to practical application. Finally, part three presents recent advances regarding sensing and structural health monitoring with a focus on how the sensing abilities can be integrated within the material and provide continuous sensing, recognizing that multifunctional materials can be designed to both improve and enhance the health-monitoring capabilities and also enable effective nondestructive evaluation. Smart Composites: Mechanics and Design is an essential text for those interested in materials that not only possess the classical properties of stiffness and strength, but also act as actuators under a variety of external stimuli, provide passive and active response to enable structural health monitoring, facilitate advanced nondestructive testing strategies, and enable shape-changing and morphing structures.
Book Synopsis Finite Element Modelling of Composite Materials and Structures by : F L Matthews
Download or read book Finite Element Modelling of Composite Materials and Structures written by F L Matthews and published by Elsevier. This book was released on 2000-10-27 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element modelling of composite materials and structures provides an introduction to a technique which is increasingly being used as an analytical tool for composite materials.The text is presented in four parts: Part one sets the scene and reviews the fundamentals of composite materials together with the basic nature of FRP and its constituents. Two-dimensional stress-strain is covered, as is laminated plated theory and its limitations. Part two reviews the basic principles of FE analysis, starting with underlying theoretical issues and going on to show how elements are derived, a model is generated and results are processed. Part three builds on the basics of FE analysis and considers the particular issues that arise in applying finite elements to composites, especially to the layered nature of the material. Part four deals with the application of FE to FRP composites, presenting analytical models alongside FE representations. Specific issues addressed include interlaminar stresses, fracture delamination, joints and fatigue. This book is invaluable for students of materials science and engineering, and for engineers and others wishing to expand their knowledge of structural analysis. Covers important work on finite element analysis of composite material performance Based on material developed for an MSc course at Imperial College, London, UK Covers particular problems such as holes, free edges with FE results compared with experimental data and classical analysis
Book Synopsis Engineering Mechanics of Composite Materials by : Isaac M. Daniel
Download or read book Engineering Mechanics of Composite Materials written by Isaac M. Daniel and published by . This book was released on 2007 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis FRP Composites for Reinforced and Prestressed Concrete Structures by : Perumalsamy Balaguru
Download or read book FRP Composites for Reinforced and Prestressed Concrete Structures written by Perumalsamy Balaguru and published by CRC Press. This book was released on 2008-11-05 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength fibre composites (FRPs) have been used with civil structures since the 1980s, mostly in the repair, strengthening and retrofitting of concrete structures. This has attracted considerable research, and the industry has expanded exponentially in the last decade. Design guidelines have been developed by professional organizations in a nu
Book Synopsis Industrial Applications of Carbon Nanotubes by : Huisheng Peng
Download or read book Industrial Applications of Carbon Nanotubes written by Huisheng Peng and published by William Andrew. This book was released on 2016-10-08 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial Applications of Carbon Nanotubes covers the current applications of carbon nanotubes in various industry sectors, from the military to visual display products, and energy harvesting and storage. It also assesses the opportunities and challenges for increased commercialization and manufacturing of carbon nanotubes in the years ahead. Real-life case studies illustrate how carbon nanotubes are used in each industry sector covered, providing a valuable resource for scientists and engineers who are involved and/or interested in carbon nanotubes in both academia and industry. The book serves as a comprehensive guide to the varied uses of carbon nanotubes for specialists in many related fields, including chemistry, physics, biology, and textiles. Explains how carbon nanotubes can be used to improve the efficiency and performance of industrial products Includes real-life case studies to illustrate how carbon nanotubes have been successfully employed Explores how carbon nanotubes could be mass-manufactured in the future, and outlines the challenges that need to be overcome
Book Synopsis Textile Reinforced Cement Composites by : Jan Wastiels
Download or read book Textile Reinforced Cement Composites written by Jan Wastiels and published by MDPI. This book was released on 2020-03-05 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue presents the latest advances in the field of Textile-Reinforced Cement Composites, including Textile-Reinforced Concrete (TRC), Textile-Reinforced Mortar (TRM), Fabric-Reinforced Cementitious Matrix (FRCM), etc. These composite materials distinguish themselves from other fibre-reinforced concrete materials by their strain-hardening behaviour under tensile loading. This Special Issue is composed of 14 papers covering new insights in structural and material engineering. The papers include investigations on the level of the fibre reinforcement system as well as on the level of the composites, investigating their impact and fatigue behaviour, durability and fire behaviour. Both the strengthening of existing structures and the development of new structural systems such as lightweight sandwich systems are presented, and analysis and design methods are discussed. This Special Issue demonstrates the broadness and intensity of the ongoing advancements in the field of Textile-Reinforced Cement composites and the importance of several future research directions.
Book Synopsis Materials, Design, and Manufacturing for Sustainable Environment by : Santhakumar Mohan
Download or read book Materials, Design, and Manufacturing for Sustainable Environment written by Santhakumar Mohan and published by Springer Nature. This book was released on 2021-02-06 with total page 909 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the select proceedings of the International Conference on Materials, Design and Manufacturing for Sustainable Environment (ICMDMSE 2020). The primary focus is on emerging materials and cutting-edge manufacturing technologies for sustainable environment. The book covers a wide range of topics such as advanced materials, vibration, tribology, finite element method (FEM), heat transfer, fluid mechanics, energy engineering, additive manufacturing, robotics and automation, automobile engineering, industry 4.0, MEMS and nanotechnology, optimization techniques, condition monitoring, and new paradigms in technology management. Contents of this book will be useful to students, researchers, and practitioners alike.
Book Synopsis Post-impact Fatigue Behavior of Composite Laminates by : Alkis Paipetis
Download or read book Post-impact Fatigue Behavior of Composite Laminates written by Alkis Paipetis and published by . This book was released on 2010 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adhesive Bonding of Aircraft Composite Structures by : Welchy Leite Cavalcanti
Download or read book Adhesive Bonding of Aircraft Composite Structures written by Welchy Leite Cavalcanti and published by Springer. This book was released on 2021-06-04 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is open access under a CC BY 4.0 license. It presents the results of the ComBoNDT European project, which aimed at the development of more secure, time- and cost-saving extended non-destructive inspection tools for carbon fiber reinforced plastics, adhered surfaces and bonded joints. The book reports the optimal use of composite materials to allow weight savings, reduction in fuel consumptions, savings during production and higher cost efficiency for ground operations.
Book Synopsis Composites and Their Applications by : Ning Hu
Download or read book Composites and Their Applications written by Ning Hu and published by IntechOpen. This book was released on 2012-08-22 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites are a class of material, which receives much attention not only because it is on the cutting edge of active material research fields due to appearance of many new types of composites, e.g., nanocomposites and bio-medical composites, but also because there are a great deal of promise for its potential applications in various industries ranging from aerospace to construction due to its various outstanding properties. This book mainly describes some potential applications and the related properties of various composites by focusing on the following several topics: health or integrity monitoring techniques of composites structures, bio-medical composites and their applications in dental or tissue materials, natural fiber or mineral filler reinforced composites and their property characterization, catalysts composites and their applications, and some other potential applications of fibers or composites as sensors, etc. This book has been divided into five sections to cover the above contents.
Book Synopsis Composite Materials by : Kamal K. Kar
Download or read book Composite Materials written by Kamal K. Kar and published by Springer. This book was released on 2016-10-14 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are used as substitutions of metals/traditional materials in aerospace, automotive, civil, mechanical and other industries. The present book collects the current knowledge and recent developments in the characterization and application of composite materials. To this purpose the volume describes the outstanding properties of this class of advanced material which recommend it for various industrial applications.
Book Synopsis Mechanics of Composite Materials by : Autar K. Kaw
Download or read book Mechanics of Composite Materials written by Autar K. Kaw and published by CRC Press. This book was released on 2005-11-02 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1997, Dr. Kaw introduced the first edition of Mechanics of Composite Materials, receiving high praise for its comprehensive scope and detailed examples. He also introduced the groundbreaking PROMAL software, a valuable tool for designing and analyzing structures made of composite materials. Updated and expanded to reflect recent advances in the
