Download or read book Characterization and Modeling of the Effect of Environmental Degradation on Flexural Strength of Carbon epoxy Composites written by Sneha Anil Chawla and published by . This book was released on 2010 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mechanism-based modeling methodology has developed for prediction of long-term durability of composites for emerging facilities in different climatic zones. The objective of the research was to develop a predictive tool using the Arrhenius principles adapted to the TTS (Time Temperature Superposition) to measure degradation of carbon-fiber/epoxy composite under hygrothermal exposure and applied tensile stress. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures, viz., hot/dry, hot/wet, cold/dry, and cold/wet. Short term tests were performed to determine the flexural strength of environmentally aged composite specimens in accordance with ASTM D2344-84 and ASTM D7264 respectively. Carbon/epoxy specimens of [02/902]2s configuration were manufactured for flexure tests using Vacuum Assisted Resin Transfer Molding (VARTM). A unique strain fixture was designed to apply constant strain on the specimens during ageing and applied a simple methodology to eliminate excessive creep in the specimens. A two-dimensional cohesive layer constitutive model with a cubic traction-separation law has being developed in order to predict the life of the composite under hygrothermal conditions. The model simulated the test conditions and predicted the progressive failure mechanism of the specimen as observed in the tests, under various loading conditions. The model also incorporated synergistic interactions between temperature, moisture and stress effects and predicted degradation in strength and stiffness as a function of different ageing conditions and ageing times. Model predictions have been benchmarked using test data.

Download or read book Characterization and Modeling of the Effect of Environmental Degradation on Interlaminar Shear Strength of Carbon epoxy Composites written by Srikanth Goruganthu and published by . This book was released on 2008 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fibrous Polymeric Composites written by Bankim Chandra Ray and published by CRC Press. This book was released on 2018-05-20 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book emphasizes the scientific origin of deformation and damage of FRP composites under various environmental effects and analyses present understanding on degradation mechanisms, role of interfaces and addition of nanofillers Discusses micro-characterization of composites and interfaces, also includes micro-mechanisms and microscopic evidences to establish the structure-property correlation Elucidates advantages and limitations of FRP composites in supercritical applications

Download or read book Experimental and Computational Investigation of the Effect of Environmental Degradation on Interlaminar Shear Strength of Carbon epoxy Composites written by Avinash Reddy Akepati and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of environmental and loading conditions on the degradation of Interlaminar Shear Strength (ILSS) of the carbon-epoxy composite specimens was studied in the current research. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures. Short beam shear tests (SBST) were performed to determine the Interlaminar Shear Strength (ILSS) of environmentally aged composite specimens in accordance with ASTM D2344-84. Initially, a standard two-dimensional cohesive layer constitutive model with a cubic traction-separation law was employed in order to simulate the experiment using an in-house Finite Element Analysis code (NOVA-3D). Numerical instabilities encountered using the standard elastic cohesive layer model were overcome by incorporating viscoelastic regularization in the constitutive equations of the cohesive layer. This modification also enabled the analysis to continue beyond the point of peak failure load. The model was able to accurately simulate the load-deflection behavior of most of the SBST specimens aged under various hygrothermal and synergistically applied stress conditions. Further, the effect of displacement rate on ILSS of specimens was studied using NOVA-3D. A PC based life prediction software, Composite Performance Predictive Tool (CPPT), was developed using a mechanism-based degradation model in order to predict the life of a composite structure under given environmental and loading conditions. The software was benchmarked using the test data.

Download or read book Biobased Composites written by Anish Khan and published by John Wiley & Sons. This book was released on 2021-02-01 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explore the world of biocomposites with this one-stop resource edited by four international leaders in the field Bio-based Composites: Characterization, Properties, and Applications delivers a comprehensive treatment of all known characterization methods, properties, and industry applications of bio-based composites materials. This unique, one-stop resource covers all major developments in the field from the last decade of research into this environmentally beneficial area. The internationally recognized editors have selected resources that represent advances in the mechanical, thermal, tribological, and water sorption properties of bio-based composites, and cover new areas of research in physico-chemical analysis, flame retardancy, failure mechanisms, lifecycle assessment, and modeling of bio-based composites. The low weight, low cost, excellent thermal recyclability, and biodegradability of bio-based composites make them ideal candidates to replace engineered plastic products derived from fossil fuel. This book provides its readers with the knowledge they’ll require to understand a new class of materials increasingly being used in the automotive and packaging industries, aerospace, the military, and construction. It also includes: An extended discussion of the environmental impact of bio-based composites using a lice cycle methodology A review of forecasts of natural fiber reinforced polymeric composites and its degradability concerns An analysis of the physical and mechanical properties of a bio-based composite with sisal powder A comprehensive treatment of the mechanical, thermal, tribological, and dielectric properties of bio-based composites A review of processing methods for the manufacture of bio-based composites Perfect for materials scientists in private industry, government laboratories, or engaged in academic research, Bio-Based Composites will also earn a place in the libraries of industrial and manufacturing engineers who seek a better understanding of the beneficial industrial applications of biocomposites in industries ranging from automobiles to packaging.

Download or read book ICCS21 written by Antonio J.M. Ferreira and published by Società Editrice Esculapio. This book was released on 2018-07-23 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well-known that the topic of composite mate- rials affects many engineering fields, such as civil, mechanical, aerospace, automotive and chemical. In the last decades, in fact, a huge number of scientific papers concerning these peculiar constituents has been published. Analogously, the industrial progress has been extremely noticeable. The study of composite materials, in general, is a challenging activity since the advancements both in the academia and in the industry provide continually new sparks to develop innovative ideas and applications. The communication, the sharing and the exchange of views can surely help the works of many researchers. This aspect represents the main purpose of this Conference, which aims to collect high-level contributions on the development and the application of composite materials. The establishment of this 21st edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Bologna (Italy), selected plenary and key-note lectures have been collected in the present book.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Proceedings of the 2nd International Conference on Structural Damage Modelling and Assessment written by Magd Abdel Wahab and published by Springer Nature. This book was released on 2021-12-04 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the select proceedings from the 2nd International Conference on Structural Damage Modelling and Assessment (SDMA 2021) held in the city of Ghent, Belgium, on 4–5 August 2021. It discusses the recent advances in fields related to damage modelling, damage detection and assessment, non-destructive testing and evaluation, structure integrity and structural health monitoring. The conference covers all research topics and applications relevant to structural damage modelling and assessment using theoretical, numerical and experimental techniques. This book is useful to scientists and engineers in academia and industry who are interested in the field of structural damage and integrity for disaster risk reduction.

Download or read book MULTI SCALE CHARACTERIZATION AND MODELLING OF NANOSILICA REINFORCED CARBON EPOXY COMPOSITES FOR FILAMENT WOUND STRUCTURES written by Aniruddh Vashisth and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced composite driveshaft are seen as an attractive replacement for metallic driveshaft in helicopters. Rigid matrix composite (RMC) are composites reinforced with a strong fiber such as carbon fibers in a rigid matrix such as an epoxy. Matrix plays an important role in the determining the properties of the fiber composites, for instance mechanical and thermal properties can be tailored by changing molecular structure of the polymer matrix or incorporating nanoparticles in the matrix. The objective of this research is to evaluate, experimentally and analytically, at multiple length scales, the effects of adding spherical nanosilica (NS) particles on the thermomechanical properties of carbon/epoxy composites. Starting from a molecular scale, a novel thermodynamically fundamental mechanism is developed that simulates the cross-linking of epoxide and an aromatic amine (DETDA) curing agent. Good agreement between the simulations and the experimental results were seen for tensile modulus, glass transition temperature, and mass density. The complete simulation procedure, including cross-linking, equilibration and testing of the polymer, was carried out using reactive force fields.Epoxies cured with three different curing agents (3,3-diaminodiphenylsulfone (DDS), 4-4-DDS, and DETDA) were included in all the experiments. Epoxies with variable concentrations of NS were mechanically characterized for modulus, fracture toughness, density, and glass transition temperature. The addition of NS improved the modulus and fracture toughness, although it also decreased the glass transition temperature slightly, possibly due to the diluent component of the master batch of NS-filled bis F. This investigation provides, for the first time, a full set of 2-D lamina properties of T700 carbon fiber composites with 0 wt % NS (0NS) and 37 wt % NS (37NS) cured with DETDA. Equations for predicting the 2D properties as functions of NS and carbon fiber contents were developed using micromechanics principals and backed-out properties of T700 fibers. At the lamina level, NS increased the longitudinal and transverse compression strengths and descreased the transverse coefficient of thermal expansion, which are beneficial for overall composite performance. Using these predictive equations, a simple design exercise was conducted for []5 carbon/epoxy driveshafts with and without NS, considering strength, buckling, torsional stiffness, and whirl. The use of NS improved the safety factors for strength, buckling, and torsional stiffness for all ply angles. However, using NS increased the weight of the shaft and consequently reduced the safety factor for whirl at ply angles less than approximately 60 degrees, which is the realm where NS does not significantly increase the bending stiffness of the shaft due to the dominating effect of the fibers.Tubular specimens with 0, 15, 25 and 34 wt % NS cured with 4,4DDS and 0 and 37 wt % NS cured with DETDA were ballistically impacted at normal incidence and evaluated for damage area and residual torsional strength. This is the first study on NS-filled composites with ballistic impact where the projectile punctures through the composite. Incoporating NS into the composite decreased the projected damage area, increased the residual torsional strength, and increased the energy absorption per unit projected damage area. Specimens manufactured with 15NS/DDS and 25NS/DDS exhibited the highest residual strengths. An analytical model was developed to calculate the damage area and residual projectile velocity after normal-incidence impact. This model is an extension of a previous energy-based model for cross-ply laminates, with original modifications developed for angle plies and dual walls. Good agreement between the experimental and analytical residual velocities was obtained. Analytical and experimental damage areas display a similar trend with NS content, but the analytical damage areas were always less than the experimental areas. Tubular specimens with 0 and 15 wt % NS with DETDA curing agent were obliquely impacted with a ballistic projectile and subjected to residual torsional strength testing. No significant change in damage area or residual torsional strength was seen in these experiments, indicating a negligible effect of NS in an impact scenario where the oblique path of the projectile, rather than the toughness of the composite, is the main factor affecting the size of the damage zone.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1980 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book environmental effects on advanced composite materials written by Christian JL. and published by ASTM International. This book was released on 1976 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physico mechanical Characterization of T700 Based Carbon epoxy Systems for Infrastructure Rehabilitation written by Araceli Del Carmen Abanilla and published by . This book was released on 2004 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Adhesion at Carbon Fiber fluorinated Epoxy Interface and Effect of Environmental Degradation written by Suman Dasgupta and published by . This book was released on 2011 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delamination Behaviour of Composites written by Srinivasan Sridharan and published by Elsevier. This book was released on 2008-10-21 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given such advantages as low weight compared to strength and toughness, laminated composites are now used in a wide range of applications. Their increasing use has underlined the need to understand their principal mode of failure, delamination. This important book reviews key research in understanding and preventing delamination.The first part of the book reviews general issues such as the role of fracture mechanics in understanding delamination, design issues and ways of testing delamination resistance. Part two describes techniques for detecting and characterising delamination such as piezoelectric sensors, the use of lamb waves and acoustic emission techniques. The next two sections of the book discuss ways of studying and modelling delamination behaviour. The final part of the book reviews research on delamination behaviour in particular conditions such as shell and sandwich structures, z-pin bridging and resin bonding.With its distinguished editor and international team of contributors, Delamination behaviour of composites is a standard reference for all those researching laminated composites and using them in such diverse applications as microelectronics, aerospace, marine, automotive and civil engineering. - Reviews the role of fracture mechanics in understanding delamination, design issues and ways of testing delamination resistance - Discuss ways of studying and modelling delamination behaviour - A standard reference for all those researching laminated composites

Download or read book Proceedings of the 11th International Conference on Composite Materials written by Murray L. Scott and published by Woodhead Publishing. This book was released on 1997 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Society of Composites 28th Technical Conference written by Charles Bakis and published by DEStech Publications, Inc. This book was released on 2013-11-01 with total page 1892 pages. Available in PDF, EPUB and Kindle. Book excerpt: New and unpublished U.S. and international research on multifunctional, active, biobased, SHM, self-healing composites -- from nanolevel to large structures New information on modeling, design, computational engineering, manufacturing, testing Applications to aircraft, bridges, concrete, medicine, body armor, wind energy This fully searchable CD-ROM contains 135 original research papers on all phases of composite materials. The document provides cutting edge research by US, Canadian, and Japanese authorities on matrix-based and fiber composites from design to damage analysis and detection. Major divisions of the work include: Structural Health Monitoring, Multifunctional Composites, Integrated Computational Materials Engineering, Interlaminar Testing, Analysis-Shell Structures, Thermoplastic Matrices, Analysis Non-classical Laminates, Bio-Based Composites, Electrical Properties, Dynamic Behavior, Damage/Failure, Compression-Testing, Active Composites, 3D Reinforcement, Dielectric Nanocomposites, Micromechanical Analysis, Processing, CM Reinforcement for Concrete, Environmental Effects, Phase-Transforming, Molecular Modeling, Impact.

Download or read book Environmental Degradation of Industrial Composites written by Celine A Mahieux and published by Elsevier. This book was released on 2005-12-14 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thanks to their low density and tailored properties, polymer matrix composites are attractive candidates for a large number of industrial applications ranging from aerospace to transportation and energy. However, the behaviour of polymer-based materials is strongly affected by a number of environmental factors. Environmental Degradation in Industrial Composites provides vital information on the effects of environmental factors such as temperature, liquid and gas exposure, electrical fields and radiations, and how micro- and micromechanical calculations during design and manufacture must take these effects into account. The book concludes with reviews on standard and specific testing methods for the various environmental factors and their combinations, helping mechanical/materials engineers and specifiers to predict possible changes due to environmental conditions. Each chapter is supplemented by industrial case studies to help in the understanding of degradation of composites in real life situations.This book will help you to...* Understand how environmental factors lead to degradation effects in polymer matrix composite structures* Build these factors into calculations when predicting the part performance and lifetime of structures* Compare real-life situations from case studies with your predicted results* Predict probable composite behaviour with greater accuracyThis book will help you to...* Understand how environmental factors lead to degradation effects in polymer matrix composite structures* Build these factors into calculations when predicting the part performance and lifetime of structures* Compare real-life situations from case studies with your predicted results* Predict probable composite behaviour with greater accuracy