Download or read book In situ Damage and Strain Monitoring of Large Polymer Composite Structures Using Carbon Nanotube Networks written by Ali Naghashpour and published by . This book was released on 2014 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, multiwalled carbon nanotubes (MWCNTs) have been introduced in fiber reinforced polymer composites (FRPC) to enhance their capabilities in terms of sensing and improving electrical properties. Even though there have been extensive studies on incorporating MWCNTs into polymer matrix composites to monitor their integrity, no work has been found to provide a technique to detect, locate and quantify damage in large polymer composite structure (LPCS) and also to investigate electrical resistance behavior of glass fiber/epoxy/MWCNT composites subjected to multi-directional deformation. The thesis is organized into two major sections: Developing two new structural health monitoring (SHM) techniques to detect, locate and quantify damages in LPCS, and investigating electrical resistance behavior of glass fiber/epoxy/MWCNT composites subjected to multi-directional deformation. In the first part of the thesis, two new, practical and real-time SHM techniques have been developed. One is for LPCS made of electrically non-conducive fibers and MWCNT networks. The other is for LPCS made of electrically conducive fibers and MWCNT networks. In these techniques, MWCNTs are added into epoxy matrix. This modified matrix is then incorporated with long fibers to make large composite plates. Two different strategies have been proposed for measuring electrical properties of LPCS depending on the type of fibers. The large plate is marked with grid points where electrically conductive silver paints are deposited. The electrical resistances and potentials between the grid points for electrically non-conductive fibers and conductive fibers reinforced polymer composite structures containing MWCNT are measured respectively. These values are used as reference sets. It has been shown that the occurrence of the damage makes the electrical properties between the contact points surrounding this damage change. The significant change in the electrical properties between contact points is used as an indication for detection, location and quantification of damage in the large plates. The SHM computer programs are written to provide the facility to detect, locate and quantify damage for the LPCSs in real-time. Two new concepts have been introduced for detecting, locating and quantifying damage in LPCSs using MWCNT networks. One is uniformity of MWCNT distribution. The other is sensitivity to change in electrical resistance. A new model of resistors network has been proposed for composite plates with different electrical conductivity as a result of different quantity of MWCNT. Theoretical analyses are performed based on Ohm’s and Kirchhoff’s laws using Matlab Simulink. Good agreement is found between experimental and simulation results. In the second part of the thesis, the behavior of electrical resistance for glass fiber/epoxy composite laminates containing MWCNT subjected to uniaxial stresses along different directions is investigated. An explanation is provided for the electrical resistance behavior of the laminates containing MWCNT subjected to multi-directional deformation.
Download or read book Health Monitoring of Aerospace Structures written by Wieslaw Staszewski and published by John Wiley & Sons. This book was released on 2004-02-13 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing quality research for the reader, this title encompasses all the recent developments in smart sensor technology for health monitoring in aerospace structures, providing a valuable introduction to damage detection techniques. Focussing on engineering applications, all chapters are written by smart structures and materials experts from aerospace manufacturers and research/academic institutions. This key reference: Discusses the most important aspects related to smart technologies for damage detection; this includes not only monitoring techniques but also aspects related to specifications, design parameters, assessment and qualification routes. Presents real case studies and applications; this includes in-flight tests; the work presented goes far beyond academic research applications. Displays a balance between theoretical developments and engineering applications
Download or read book Towards Structural Health Monitoring in Carbon Nanotube Reinforced Composites written by Wennie Wang and published by . This book was released on 2013 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted to understand the non-destructive evaluation (NDE) capabilities of carbon nanotubes (CNTs) of several network architectures towards structural health monitoring (SHM). As heterogeneous composite structures become increasingly common in industry, detecting mechanical damage and damage accumulation becomes increasingly difficult as many modes of failure occur below the external surface. Traditional SHM techniques may be time consuming and costly; however, CNTs are a unique material that shows promise as a strain or damage sensor. Three different laminate samples types with various CNT network architectures were tested in open-hole tension. Samples tested were quasiisotropic carbon fiber, carbon fiber prepreg with unidirectional knocked-down CNT surface patch, and fuzzy fiber reinforced plastic (FFRP) samples, which consist of radially grown CNTs on a woven ceramic fiber substrate. Mechanical load and electrical resistance were simulataneously measured using three different probes configurations with respect to the tensile direction that measured either surface or through thickness resistance changes. Measurements were taken near and away from the stress concentration. Results indicated that different CNT network architectures influenced the consistency and efficacy of indicating damage acculumation. Changes in electrical resistance correlated strongly with sample mechanical damage accumulation for unidirectional knocked-down CNTs, but had more consistent values and readings for the FFRP samples, indicating that CNT network architecture beyond the inherent piezoresistivity of the CNT heavily influences the NDE capabilities of using CNTs as strain or damage sensors. Results also suggest that CNT network architecture must be further optimized to achieve reliable NDE and SHM, and may depend on the desired application.
Download or read book Carbon Nanotube Reinforced Polymers written by Roham Rafiee and published by Elsevier. This book was released on 2017-10-06 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotube-Reinforced Polymers: From Nanoscale to Macroscale addresses the advances in nanotechnology that have led to the development of a new class of composite materials known as CNT-reinforced polymers. The low density and high aspect ratio, together with their exceptional mechanical, electrical and thermal properties, render carbon nanotubes as a good reinforcing agent for composites. In addition, these simulation and modeling techniques play a significant role in characterizing their properties and understanding their mechanical behavior, and are thus discussed and demonstrated in this comprehensive book that presents the state-of-the-art research in the field of modeling, characterization and processing. The book separates the theoretical studies on the mechanical properties of CNTs and their composites into atomistic modeling and continuum mechanics-based approaches, including both analytical and numerical ones, along with multi-scale modeling techniques. Different efforts have been done in this field to address the mechanical behavior of isolated CNTs and their composites by numerous researchers, signaling that this area of study is ongoing. - Explains modeling approaches to carbon nanotubes, together with their application, strengths and limitations - Outlines the properties of different carbon nanotube-based composites, exploring how they are used in the mechanical and structural components - Analyzes the behavior of carbon nanotube-based composites in different conditions
Download or read book Carbon Nanotube Enhanced Aerospace Composite Materials written by A. Paipetis and published by Springer Science & Business Media. This book was released on 2012-09-14 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: The well documented increase in the use of high performance composites as structural materials in aerospace components is continuously raising the demands in terms of dynamic performance, structural integrity, reliable life monitoring systems and adaptive actuating abilities. Current technologies address the above issues separately; material property tailoring and custom design practices aim to the enhancement of dynamic and damage tolerance characteristics, whereas life monitoring and actuation is performed with embedded sensors that may be detrimental to the structural integrity of the component. This publication explores the unique properties of carbon nanotubes (CNT) as an additive in the matrix of Fibre Reinforced Plastics (FRP), for producing structural composites with improved mechanical performance as well as sensing/actuating capabilities. The successful combination of the CNT properties and existing sensing actuating technologies leads to the realization of a multifunctional FRP structure. The current volume presents the state of the art research in this field. The contributions cover all the aspects of the novel composite systems, i.e. modeling from nano to macro scale, enhancement of structural efficiency, dispersion and manufacturing, integral health monitoring abilities, Raman monitoring, as well as the capabilities that ordered carbon nanotube arrays offer in terms of sensing and/or actuating in aerospace composites.
Download or read book Damage Detection in Composite Materials Using Carbon Nanotube Threads as Sensors written by Maruthi Amardeep Sri Vatsavaya and published by . This book was released on 2011 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials have excellent mechanical and thermal properties and are the materials of choice for many applications. Even so, the low inter-laminar mechanical properties and poor impact resistance of fiber reinforced composite materials has limited their use. Broader use of composites would be possible if, there was a continuous structural monitoring that could ensure the safe operation and economical maintenance of composites. The monitoring system can be made reliable and economical if the sensors could be embedded within the material. This thesis proposes a new approach to monitor the state of strain and delamination in composite materials. The method is to use carbon nanotube thread as a continuous sensor that can be placed wherever desired inside or onto the composite material. This thesis indicates the approach is new, simple and reliable. The significance of this continuous sensor is that it opens up development of the next generation of composite materials and structures that continuously monitor their state of strain and damage. This will provide a better prediction of their life span and allow the possibility of applying corrective action if neededThis thesis investigates structural health monitoring of simple composites based on monitoring the electrical resistance of fine threads used as embedded sensors. The threads are spun from Carbon Nanotube arrays. The threads exhibit a tailorable piezo-resistive property, which is the basis of the sensor operation. It is shown that the presence of CNT threads in simple specimens does not cause any significant voids or areas of stress concentrations, which might affect the overall mechanical properties of the material. Two types of sensor configurations were evaluated; a straight sensor and a stitched sensor. The behavior of these sensors was compared under tensile and bending loads in composite materials. These sensors are tested both for damage detection and strain sensing and successfully detected when the damage reached the thread. The continuous thread sensor may be an important component in the design of future aerospace composite structures that operate safely and economically.
Download or read book Polymer Carbon Nanotube Composites written by Tony McNally and published by Elsevier. This book was released on 2011-03-28 with total page 849 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the properties of polymer carbon nanotube (CNT) composites is the key to these materials finding new applications in a wide range of industries, including but not limited to electronics, aerospace and biomedical/bioengineering. Polymer-carbon nanotube composites provides comprehensive and in-depth coverage of the preparation, characterisation, properties and applications of these technologically interesting new materials.Part one covers the preparation and processing of composites of thermoplastics with CNTs, with chapters covering in-situ polymerization, melt processing and CNT surface treatment, as well as elastomer and thermoset CNT composites. Part two concentrates on properties and characterization, including chapters on the quantification of CNT dispersion using microscopy techniques, and on topics as diverse as thermal degradation of polymer/CNT composites, the use of rheology, Raman spectroscopy and multi-scale modelling to study polymer/CNT composites, and CNT toxicity. In part three, the applications of polymer/CNT composites are reviewed, with chapters on specific applications such as in fibres and cables, bioengineering applications and conductive polymer CNT composites for sensing.With its distinguished editors and international team of contributors, Polymer-carbon nanotube composites is an essential reference for scientists, engineers and designers in high-tech industry and academia with an interest in polymer nanotechnology and nanocomposites. - Provides comprehensive and in-depth coverage of the preparation, characterisation and properties of these technologically interesting new materials - Reviews the preparation and processing of composites of thermoplastics with CNTs, covering in-situ polymerization, melt processing and CNT surface treatment - Explores applications of polymer/CNT composites such as in fibres and cables, bioengineering applications and conductive polymer CNT composites for sensing
Download or read book Structural Health Monitoring For Advanced Composite Structures written by M H Ferri Aliabadi and published by World Scientific. This book was released on 2017-12-18 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural health monitoring (SHM) is a relatively new and alternative way of non-destructive inspection (NDI). It is the process of implementing a damage detection and characterization strategy for composite structures. The basis of SHM is the application of permanent fixed sensors on a structure, combined with minimum manual intervention to monitor its structural integrity. These sensors detect changes to the material and/or geometric properties of a structural system, including changes to the boundary conditions and system connectivity, which adversely affect the system's performance.This book's primary focus is on the diagnostics element of SHM, namely damage detection in composite structures. The techniques covered include the use of Piezoelectric transducers for active and passive Ultrasonics guided waves and electromechanical impedance measurements, and fiber optic sensors for strain sensing. It also includes numerical modeling of wave propagation in composite structures. Contributed chapters written by leading researchers in the field describe each of these techniques, making it a key text for researchers and NDI practitioners as well as postgraduate students in a number of specialties including materials, aerospace, mechanical and computational engineering.
Download or read book Carbon Nanotube Polymer Composites written by Dimitrios Tasis and published by Royal Society of Chemistry. This book was released on 2015-11-09 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemically-modified carbon nanotubes (CNTs) exhibit a wide range of physical and chemical properties which makes them an attractive starting material for the preparation of super-strong and highly-conductive fibres and films. Much information is available across the primary literature, making it difficult to obtain an overall picture of the state-of-the-art. This volume brings together some of the leading researchers in the field from across the globe to present the potential these materials have, not only in developing and characterising novel materials but also the devices which can be fabricated from them. Topics featured in the book include Raman characterisation, industrial polymer materials, actuators and sensors and polymer reinforcement, with chapters prepared by highly-cited authors from across the globe. A valuable handbook for any academic or industrial laboratory, this book will appeal to newcomers to the field and established researchers alike.
Download or read book Reliable Electrical Connections written by George C. Marshall Space Flight Center and published by . This book was released on 1963 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Nanotube Based Nanocomposites written by Anna Boczkowska and published by Mdpi AG. This book was released on 2021-10-18 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Special issue, "Carbon nanotube-based nanocomposites", provides an extensive overview of current trends in the area of polymer matrix nanocomposites based on carbon nanotubes (CNTs) from the papers contributed by internationally recognized specialists. The Special Issue brings together 7 papers that deal with the various aspects of processing, as well as experimental and analytical approaches to carbon nanotube-based nanocomposites fabrication, characterization and application. Each paper demonstrates how enhancements in materials, processes and characterization techniques can improve performance in the field of engineering. The Special issue gives a unique opportunity to discover the latest research on carbon nanotube-based nanocomposites from different laboratories. Numerous references are given at the end of each paper to enable the reader to explore the topics covered in greater detail. Most of the papers describe the improvement of electrical and mechanical properties of polymer-based nanocomposites due to the application of CNTs, independently on the matrix used: (ethylene vinyl acetate) copolymer, hot melt copolyamides, epoxy and silicone resins. In each case, the relationships between the processing parameters and microstructure of obtained nanocomposites were described. The synergistic effect of hybrid nanofillers was also explored in nanocomposites with carbon and halloysite nanotubes. The effect of carbon nanotubes on the wear behavior of nanocomposites based on epoxy resin was investigated as well. The original results on the synthesis and characterization of composite shear thickening fluids containing carbon nanofillers are presented. The addition of the CNTs modified the impact absorption ability of such fluids. The presented Special Issue results also proved that CNTs can be used to obtain more resistant and durable cement-based composites.
Download or read book Graphene Nanoplatelets written by Silvia González Prolongo and published by MDPI. This book was released on 2020-04-24 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene nanoplatelets (GNPs) have attracted considerable interest due to their exceptional mechanical, electrical, and thermal properties, among others. This book provides a deep review of some aspects related to the characterization of GNPs and their applications as nanoreinforcements for different types of matrices such as polymeric- or cement-based matrices. In this book, the reader will find how these nanoparticles could be used for several industrial applications such as energy production and storage or effective barrier coatings, providing a wide overview of future progress in this topic
Download or read book Design Manufacturing and Applications of Composites Tenth Workshop 2014 written by Reza Vaziri and published by DEStech Publications, Inc. This book was released on 2015-03-04 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: New strategies on fillers, reinforcements, process modeling and SHM Discusses carbon fiber, ceramic, metal, and wood compositesApplications to wind turbines, aerospace, piping The tenth in an ongoing series, this large volume contains 44 papers published for the first time on the behavior, process modeling and testing of composites, written by well-known researchers from universities and research centers in Japan and Canada. Special attention is given to advances in reinforcements, manufacturing, and sensing methods for SHM of composite processes and damage. Key words include: braided composites, nanotube, graphene nanoplatelet, moisture effects, structural health, functionally graded shells, curvilinear composite, lignin, sensors, piezoelectric, and damage sensing.
Download or read book Nanotechnology in Civil Infrastructure written by Kasthurirangan Gopalakrishnan and published by Springer Science & Business Media. This book was released on 2011-03-31 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology in Civil Infrastructure is a state-of-the art reference source describing the latest developments in nano-engineering and nano-modification of construction materials to improve the bulk properties, development of sustainable, intelligent, and smart concrete materials through the integration of nanotechnology based self-sensing and self-powered materials and cyber infrastructure technologies, review of nanotechnology applications in pavement engineering, development of novel, cost-effective, high-performance and long-lasting concrete products and processes through nanotechnology-based innovative processing of cement and cement paste, and advanced nanoscience modeling, visualization, and measurement systems for characterizing and testing civil infrastructure materials at the nano-scale. Researchers, practitioners, undergraduate and graduate students engaged in nanotechnology related research will find this book very useful.
Download or read book Carbon Nanotube Reinforced Composites written by Marcio Loos and published by Elsevier. This book was released on 2014-09-11 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotube Reinforced Composites introduces a wide audience of engineers, scientists and product designers to this important and rapidly expanding class of high performance composites. Dr Loos provides readers with the scientific fundamentals of carbon nanotubes (CNTs), CNT composites and nanotechnology in a way which will enable them to understand the performance, capability and potential of the materials under discussion. He also investigates how CNT reinforcement can be used to enhance the mechanical, electrical and thermal properties of polymer composites. Production methods, processing technologies and applications are fully examined, with reference to relevant patents. Finally, health and safety issues related to the use of CNTs are investigated. Dr. Loos compares the theoretical expectations of using CNTs to the results obtained in labs, and explains the reasons for the discrepancy between theoretical and experimental results. This approach makes the book an essential reference and practical guide for engineers and product developers working with reinforced polymers – as well as researchers and students in polymer science, materials and nanotechnology. A wealth of applications information is included, taken from the wide range of industry sectors utilizing CNT reinforced composites, such as energy, coatings, defense, electronics, medical devices, and high performance sports equipment. - Introduces a wide range of readers involved in plastics engineering, product design and manufacturing to the relevant topics in nano-science, nanotechnology, nanotubes and composites. - Assesses effects of CNTs as reinforcing agents, both in a materials context and an applications setting. - Focuses on applications aspects – performance, cost, health and safety, etc – for a wide range of industry sectors, e.g. energy, coatings, defense, electronics, medical devices, high performance sports equipment, etc.
Download or read book Carbon Nanotube Electronics written by Ali Javey and published by Springer Science & Business Media. This book was released on 2009-04-21 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a complete overview of the field of carbon nanotube electronics. It covers materials and physical properties, synthesis and fabrication processes, devices and circuits, modeling, and finally novel applications of nanotube-based electronics. The book introduces fundamental device physics and circuit concepts of 1-D electronics. At the same time it provides specific examples of the state-of-the-art nanotube devices.
Download or read book Carbon Nanotubes written by Mohamed Berber and published by BoD – Books on Demand. This book was released on 2016-07-20 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shows the recent advances of the applications of carbon nanotubes (CNTs), in particular, the polymer functionalized carbon nanotubes. It also includes a comprehensive description of carbon nanotubes' preparation, properties, and characterization. Therefore, we have attempted to provide detailed information about the polymer-carbon nanotube composites. With regard to the unique structure and properties of carbon nanotubes, a series of important findings have been reported. The unique properties of carbon nanotubes, including thermal, mechanical, and electrical properties, after polymer functionalization have been documented in detail. This book comprises 18 chapters. The chapters include different applications of polymer functionalization CNTs, e.g. photovoltaic, biomedical, drug delivery, gene delivery, stem cell therapy, thermal therapy, biological detection and imaging, electroanalytical, energy, supercapacitor, and gas sensor applications.
