Download or read book Damage Detection in Composite Interfaces Through Carbon Nanotube Reinforcement written by and published by . This book was released on 2010 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of carbon nanotubes along composite interfaces was studied to both improve fracture strength and monitor interfacial damage progression. Both carbon fiber and E-glass fiber composites were manufactured with vinyl ester resin using vacuum-assisted resin transfer molding. First, the effects of single-step curing (i.e., co-curing) versus two-step curing (i.e., curing a new section to a previously cured section) was studied using Mode II fracture testing. The results showed the two-step cured interface was as strong as the co-cured interface, thus validating the use of two-step curing during modular construction or repair of composite sections. Application of carbon nanotubes to the composite interfaces was then accomplished through two-step curing, using acetone as a dispersant. Mode II testing indicated significant improvement of the interface fracture toughness for both carbon fiber and glass fiber samples with carbon nanotubes. Because carbon nanotubes have very high electrical conductivity, the electrical resistance was measured across the interface during Mode II loading. As the interface crack grew, there was an increase in electrical resistance (approximately linear for carbon fiber specimens until final failure). The study demonstrated the feasibility of electrical resistance measurement with dispersed carbon nanotubes to monitor damage along critical interfaces, while simultaneously improving fracture properties.

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 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 Interface Interphase in Polymer Nanocomposites written by Anil N. Netravali and published by John Wiley & Sons. This book was released on 2016-11-29 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant research has been done in polymeric nanocomposites and progress has been made in understanding nanofiller-polymer interface and interphase and their relation to nanocomposite properties. However, the information is scattered in many different publication media. This is the first book that consolidates the current knowledge on understanding, characterization and tailoring interfacial interactions between nanofillers and polymers by bringing together leading researchers and experts in this field to present their cutting edge research. Eleven chapters authored by senior subject specialists cover topics including: Thermodynamic mechanisms governing nanofiller dispersion, engineering of interphase with nanofillers Role of interphase in governing the mechanical, electrical, thermal and other functional properties of nanocomposites, characterization and modelling of the interphase Effects of crystallization on the interface, chemical and physical techniques for surface modification of nanocellulose reinforcements Electro-micromechanical and nanoindentation techniques for interface evaluation, molecular dynamics (MD) simulations to quantify filler-matrix adhesion and nanocomposite mechanical properties.

Download or read book Fiber Reinforced Nanocomposites Fundamentals and Applications written by Baoguo Han and published by Elsevier. This book was released on 2020-03-13 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber-reinforced Nanocomposites: Fundamentals and Applications explores the fundamental concepts and emerging applications of fiber-reinforced nanocomposites in the automobile, aerospace, transportation, construction, sporting goods, optics, electronics, acoustics and environmental sector. In addition, the book provides a detailed overview of the properties of fiber-reinforced nanocomposites, including discussion on embedding these high-strength fibers in matrices. Due to the mismatch in structure, density, strain and thermal expansion coefficients between matrix and fibers, their thermo-mechanical properties strongly depend not only on the preparative methods, but also on the interaction between reinforcing phase and matrix phase. This book offers a concise overview of these advances and how they are leading to the creation of stronger, more durable classes of nanocomposite materials. - Explores the interaction between fiber, nanoreinforcers and matrices at the nanoscale - Shows how the properties of fiber-enforced nanocomposites are ideal for use for a variety of consumer products - Outlines the major challenges to creating fiber-reinforced nanocomposites effectively

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 Mechanics of Carbon Nanotubes written by Vasyl Harik and published by Academic Press. This book was released on 2018-07-27 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanics of Carbon Nanotubes: Fundamentals, Modeling and Safety draws on the latest academic research and nanotechnology applications to provide a comprehensive guide on the most recent developments in the science of carbon nanotubes. The fundamentals of nanomechanics and mechanical behavior of carbon nanotubes are presented in initial chapters, followed by more advanced topics such as the classification of carbon nanotubes, carbon nanotubes in nanocomposites, multiwall carbon nanotubes, and recent trends.This book provides a system for the classification of carbon nanotubes into 20 classes, aiding correct selection for various applications, and includes the Atomic Registry Matrix Analysis for nanoscale interfaces, essential for design involving friction or sliding. Parametric maps are included to help readers pick the correct model for a particular CNT geometry, in addition to a thorough examination of the effective thickness paradox and safety issues related to CNTs, such as toxicity at high aspect ratio.Mechanics of Carbon Nanotubes is essential reading for anyone involved in research or engineering that includes carbon nanotubes, be they students or seasoned professionals in the field. It is particularly useful to those working with applications in the areas of microelectronics, robotics, aerospace, composites, or prosthetics. - Provides a system for the classification of carbon nanotubes, aiding correct selection for various applications - Includes the Matrix Registry Analysis for nanoscale interfaces that is essential for design involving friction or sliding - Features parametric maps to help readers pick the right model for a particular CNT geometry (beam vs. shell vs. thin or thick shells, etc.) - Presents a thorough examination of the safety issues related to CNTs, including toxicity at high aspect ratio

Download or read book Advances in Composite Materials written by Brahim Attaf and published by BoD – Books on Demand. This book was released on 2011-03-16 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: By adopting the principles of sustainable design and cleaner production, this important book opens a new challenge in the world of composite materials and explores the achieved advancements of specialists in their respective areas of research and innovation. Contributions coming from both spaces of academia and industry were so diversified that the 28 chapters composing the book have been grouped into the following main parts: sustainable materials and ecodesign aspects, composite materials and curing processes, modelling and testing, strength of adhesive joints, characterization and thermal behaviour, all of which provides an invaluable overview of this fascinating subject area. Results achieved from theoretical, numerical and experimental investigations can help designers, manufacturers and suppliers involved with high-tech composite materials to boost competitiveness and innovation productivity.

Download or read book Non destructive Testing of Impact Damage in Fiber reinforced Polymer Composites written by Milad Saeedifar and published by Elsevier. This book was released on 2024-08-08 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-destructive Testing of Impact Damage in Fiber-reinforced Polymer Composites: Fundamentals and Applications provides detailed knowledge on the fundamentals and applications of frequently used nondestructive testing (NDT) techniques utilized to assess impact damage in composite structures. This book starts with an introduction to impact damage in composite structures, each subsequent chapter focuses on evaluating damage using specific NDT methods. Chapters 2–4 concentrate on vision-based NDT methods such as visual inspection, digital image correlation, and digital shearography. Following this, Chapters 5–6 delve into ultrasound-based methods, including acoustic emission and phased-array ultrasonic inspection. Radiation-based methods, micro-CT, and thermography are discussed in Chapters 7 and 8, while Chapters 9 and 10 elucidate microwave inspection and electrical impedance tomography. This book is a useful reference for both academia and industry and covers the fundamentals, practical tips, case studies, and applications, as well as current research trends and future possibilities, for each technique. - Insights into the diverse damage levels in composite materials resulting from low-velocity impact, ranging from micro matrix cracks to severe delamination and fiber breakage - Covers a broad range of NDT techniques, including recently developed NDT techniques, suitable for detecting impact damage in composite materials - Serves as a valuable reference for both academia and industry, providing comprehensive coverage of fundamental principles, practical insights, applications, case studies, current research trends, and future prospects for each NDT technique

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 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 MEMS and Nanotechnology Volume 4 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2011-05-21 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: MEMS and Nanotechnology, Volume 4 represents one of eight volumes of technical papers presented at the Society for Experimental Mechanics Annual Conference on Experimental and Applied Mechanics, held at Uncasville, Connecticut, June 13-16, 2011. The full set of proceedings also includes volumes on Dynamic Behavior of Materials, Mechanics of Biological Systems and Materials, Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials; Optical Measurements, Modeling and, Metrology; Experimental and Applied Mechanics, Thermomechanics and Infra-Red Imaging, and Engineering Applications of Residual Stress.

Download or read book Advances in Materials Science for Environmental and Energy Technologies V written by Tatsuki Ohji and published by John Wiley & Sons. This book was released on 2016-09-27 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains a collection of 20 papers from the following symposia held during the 2015 Materials Science and Technology (MS&T '15) meeting: 7th International Symposium on Green and Sustainable Technologies for Materials Manufacturing Processing Materials for Nuclear Applications and Extreme Environments Materials Issues in Nuclear Waste Management in the 21st Century Nanotechnology for Energy, Healthcare and Industry Materials for Processes for CO2 Capture, Conversion and Sequestration Hybrid Organic – Inorganic Materials for Alternative Energy

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 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 Marine Applications of Advanced Fibre reinforced Composites written by Jasper Graham-Jones and published by Woodhead Publishing. This book was released on 2015-09-28 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: The marine environment presents significant challenges for materials due to the potential for corrosion by salt water, extreme pressures when deeply submerged and high stresses arising from variable weather. Well-designed fibre-reinforced composites can perform effectively in the marine environment and are lightweight alternatives to metal components and more durable than wood. Marine Applications of Advanced Fibre-Reinforced Composites examines the technology, application and environmental considerations in choosing a fibre-reinforced composite system for use in marine structures. This book is divided into two parts. The chapters in Part One explore the manufacture, mechanical behavior and structural performance of marine composites, and also look at the testing of these composites and end of life environmental considerations. The chapters in Part Two then investigate the applications of marine composites, specifically for renewable energy devices, offshore oil and gas applications, rigging and sails. Underwater repair of marine composites is also reviewed. - Comprehensively examines all aspects of fibre-reinforced marine composites, including the latest advances in design, manufacturing methods and performance - Assesses the environmental impacts of using fibre-reinforced composites in marine environments, including end of life considerations - Reviews advanced fibre-reinforced composites for renewable energy devices, rigging, sail textiles, sail shape optimisation and offshore oil and gas applications

Download or read book Characterization of Carbon Nanotube Based Composites under Consideration of Defects written by Moones Rahmandoust and published by Springer. This book was released on 2015-10-14 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the characterization methods involved with carbon nanotubes and carbon nanotube-based composites, with a more detailed look at computational mechanics approaches, namely the finite element method. Special emphasis is placed on studies that consider the extent to which imperfections in the structure of the nanomaterials affect their mechanical properties. These defects may include random distribution of fibers in the composite structure, as well as atom vacancies, perturbation and doping in the structure of individual carbon nanotubes.