Electron Beam E Beam Processing As A Means Of Achieving High Performance Composite Structures

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Electron-Beam (E-Beam) Processing as a Means of Achieving High Performance Composite Structures

Author :
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (744 download)

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Book Synopsis Electron-Beam (E-Beam) Processing as a Means of Achieving High Performance Composite Structures by :

Download or read book Electron-Beam (E-Beam) Processing as a Means of Achieving High Performance Composite Structures written by and published by . This book was released on 2001 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron-beam (E-beam) curing is among the key out-of-autoclave technologies being explored for future advanced composite and adhesive applications. E-beam irradiation curing is capable of rapid and through-thickness curing of composite samples up to 2-in thickness, eliminating the need for long cure cycles in the autoclave. However, current resin and adhesive chemistries are optimized for cure by thermal initiation, which involves slow ramps and long cure cycles, particularly for thermoset composites based on epoxides. Therefore, in order to provide improved performance in composite systems cured by E-beam irradiation, a program was undertaken to investigate performance and formulation effects in two E-beam curable systems. One system, a free-radical-cured acrylic system, introduces the concept of interpenetrating network structures as a means of meeting performance requirements in E-beam-processed composites. The second resin system incorporates cationic curing of epoxides induced through Lewis acid or cation generating initiators. Additionally, a new approach to toughened interpenetrating polymer networks (IPNs) based on simultaneous cure using both free-radical and cationic-cure mechanisms is proposed along with initial experimental characterizations. The results of formulation and processing modifications on key properties of adhesives, resins, and composites structures are demonstrated.

Electron-Beam (E-Beam) Processing as a Means of Achieving High Performance Composite Structures

Author : James M. Sands
Publisher :
ISBN 13 : 9781423524830
Total Pages : 80 pages
Book Rating : 4.5/5 (248 download)

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Book Synopsis Electron-Beam (E-Beam) Processing as a Means of Achieving High Performance Composite Structures by : James M. Sands

Download or read book Electron-Beam (E-Beam) Processing as a Means of Achieving High Performance Composite Structures written by James M. Sands and published by . This book was released on 2001-11-01 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron-beam (E-beam) curing is among the key out-of-autoclave technologies being explored for future advanced composite and adhesive applications. E-beam irradiation curing is capable of rapid and through- thickness curing of composite samples up to 2-in thickness, eliminating the need for long cure cycles in the autoclave. However, current resin and adhesive chemistries are optimized for cure by thermal initiation, which involves slow ramps and long cure cycles, particularly for thermoset composites based on epoxides. Therefore, in order to provide improved performance in composite systems cured by E-beam irradiation, a program was undertaken to investigate performance and formulation effects in two E-beam curable systems. One system, a free-radical-cured acrylic system, introduces the concept of interpenetrating network structures as a means of meeting performance requirements in E-beam- processed composites. The second resin system incorporates cationic curing of epoxides induced through Lewis acid or cation generating initiators. Additionally, a new approach to toughened interpenetrating polymer networks (IPNs) based on simultaneous cure using both free-radical and cationic-cure mechanisms is proposed along with initial experimental characterizations. The results of formulation and processing modifications on key properties of adhesives, resins, and composites structures are demonstrated.

Radiation Processing of Polymer Materials and Its Industrial Applications

Author : Keizo Makuuchi
Publisher : John Wiley & Sons
ISBN 13 : 0470587695
Total Pages : 448 pages
Book Rating : 4.4/5 (75 download)

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Book Synopsis Radiation Processing of Polymer Materials and Its Industrial Applications by : Keizo Makuuchi

Download or read book Radiation Processing of Polymer Materials and Its Industrial Applications written by Keizo Makuuchi and published by John Wiley & Sons. This book was released on 2012-02-07 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text examines the effect of radiation on polymers and the versatility of its industrial applications. By helping readers understand and solve problems associated with radiation processing of polymers, it serves as an important reference and fills a gap in the literature. Radiation processing can significantly improve important properties of polymers, however, there are still misconceptions about processing polymers by using ionizing radiation. This book explains the radiation processing of polymeric materials used in many industrial products including cars, airplanes, computers, and TVs. It even addresses emerging "green" issues like biomaterials and hydrogels.

High-Performance Structural Fibers for Advanced Polymer Matrix Composites

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309096146
Total Pages : 70 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis High-Performance Structural Fibers for Advanced Polymer Matrix Composites by : National Research Council

Download or read book High-Performance Structural Fibers for Advanced Polymer Matrix Composites written by National Research Council and published by National Academies Press. This book was released on 2005-06-09 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Military use of advanced polymer matrix composites (PMC)â€"consisting of a resin matrix reinforced by high-performance carbon or organic fibersâ€"while extensive, accounts for less that 10 percent of the domestic market. Nevertheless, advanced composites are expected to play an even greater role in future military systems, and DOD will continue to require access to reliable sources of affordable, high-performance fibers including commercial materials and manufacturing processes. As a result of these forecasts, DOD requested the NRC to assess the challenges and opportunities associated with advanced PMCs with emphasis on high-performance fibers. This report provides an assessment of fiber technology and industries, a discussion of R&D opportunities for DOD, and recommendations about accelerating technology transition, reducing costs, and improving understanding of design methodology and promising technologies.

Applications of High Energy Radiations

Author : Subhendu Ray Chowdhury
Publisher : Springer Nature
ISBN 13 : 9811990484
Total Pages : 502 pages
Book Rating : 4.8/5 (119 download)

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Book Synopsis Applications of High Energy Radiations by : Subhendu Ray Chowdhury

Download or read book Applications of High Energy Radiations written by Subhendu Ray Chowdhury and published by Springer Nature. This book was released on 2023-05-14 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the applications of high-energy beam radiation for synthesis and processing of polymeric materials. It addresses fundamental nature of high energy i.e., ionizing radiations and interaction with monomers and polymers leading to a wide variety of products such as tyres, textiles, shape memory polymers, polymers for aviation and space applications, polymeric biomaterials and natural rubber latex. It discusses general principles and techniques of preparation of polymeric materials including polymer blends, composites and nanocomposites. It also includes the topic of radiation-assisted recycling of polymers through breaking of covalent bonds. This book will be useful for students, researchers and professionals in the areas of polymers science and technology, radiation technology, electron beam technology, gamma radiation technology, advanced materials technology, biomaterials technology, nanotechnology, membrane science technology and environmental science.

The Characterization of the Structure-Property Relations of Electron Beam Cured Composites

Author :
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (742 download)

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Book Synopsis The Characterization of the Structure-Property Relations of Electron Beam Cured Composites by :

Download or read book The Characterization of the Structure-Property Relations of Electron Beam Cured Composites written by and published by . This book was released on 2004 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ultimate objective of this program was to develop a fundamental understanding of the relations between the processing parameters, the resultant physical and chemical structure and the performance of E-beam cured polymer matrix composites for cryogenic fuel containment structures for future Air Force space operations vehicles. The S-beam induced cure mechanisms for cationic polymerized epoxides and free radical polymerized bismaleimides (BMI) were characterized in terms of processing variables, dissociation chemistry of the catalytic initiators, and inherent absorbed moisture. A general S-beam resin and composite cure model was developed as a function of S-beam processing variables. Stress-thermal cycling of BMI- Carbon fiber composites under cryogenic fuel simulated environments revealed that there is a high probability of microcracking with increasing number of thermo-cycles, higher pre-strain and humidity.

International Aerospace Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 1044 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Electron Beam Curing of Composites

Author : Felipe Wolff-Fabris
Publisher :
ISBN 13 : 9783446424050
Total Pages : 129 pages
Book Rating : 4.4/5 (24 download)

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Book Synopsis Electron Beam Curing of Composites by : Felipe Wolff-Fabris

Download or read book Electron Beam Curing of Composites written by Felipe Wolff-Fabris and published by . This book was released on 2011 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Electron beam curing technology for advanced composites has emerged as a credible and attractive alternative to thermal curing for most composite products. Technical advantages, such as aerospace structures, include curing at room temperature, using low-cost tooling, and the ability to fabricate large integrated structure including structures too large to fit inside autoclaves. Studies by aerospace companies have shown potential cost savings of 10-60% by using electron beam curing. In this book, both theoretical and practical aspects of electron beam curing of composites are presented, intending to build a bridge between the academic knowledge and the industrial applications."--Publisher.

Structure-Processing-Property Relationships at the Fiber-Matrix Interface in Electron-Beam Cured Composite Materials

Author :
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Structure-Processing-Property Relationships at the Fiber-Matrix Interface in Electron-Beam Cured Composite Materials by :

Download or read book Structure-Processing-Property Relationships at the Fiber-Matrix Interface in Electron-Beam Cured Composite Materials written by and published by . This book was released on 1998 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project was to characterize the properties of the resin and the fiber- resin interface in electron beam cured materials by evaluating several structural and processing parameters. The Oak Ridge National Laboratory (ORNL) has recently determined that the interlaminar shear strength properties of electron beam cured composites were 19-28% lower than for autoclave cured composites. Low interlaminar shear strength is widely acknowledged as the key barrier to the successfid acceptance and implementation of electron beam cured composites in industry. In this project we found that simple resin modification and process improvements are unlikely to substantially improve the interlaminar shear strength properties of electron beam cured composites. However, sizings and coatings were shown to improve these properties and there appears to be significant potential for further improvement. In this work we determined that the application of epoxy-based, electron beam compatible sizings or coatings onto surface- treated, unsized carbon fibers improved the composite interlaminar shear strength by as much as 55% compared to composites fabricated from surface-treated, unsized carbon fibers and 11 YO compared to composites made from surface-treated, GP sized carbon fibers. This work has identified many promising pathways for increasing the interlaminar shear strength of electron beam cured composites. As a result of these promising developments we have recently submitted a U.S. Department of Energy-Energy Research (DOE-ER) sponsored Laboratory Technical Research-Cooperative Research and Development Agreement (LTR- CRADA) proposal entitled, "Interracial Properties of Electron Beam Cured Composites", to continue this work. If funded, ORNL will lead a 3-year, $2.6 million effort involving eight industrial partners, NASA-Langley, and the U.S. Air Force. The principal objective of this CRADA is to significantly improve the interracial properties of carbon-fiber-reinforced composites beyond the current state-of-the art electron beam cured composites for use in several DOE, DoD, and industrial applications. In addition, several papers from this Laboratory Director's Research and Development (LDRD) project will be submitted to the Society for the Advancement of Materials and Process Engineering for oral presentations and publications.

High-Performance Structural Fibers for Advanced Polymer Matrix Composites

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309181836
Total Pages : 70 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis High-Performance Structural Fibers for Advanced Polymer Matrix Composites by : National Research Council

Download or read book High-Performance Structural Fibers for Advanced Polymer Matrix Composites written by National Research Council and published by National Academies Press. This book was released on 2005-05-09 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Military use of advanced polymer matrix composites (PMC)â€"consisting of a resin matrix reinforced by high-performance carbon or organic fibersâ€"while extensive, accounts for less that 10 percent of the domestic market. Nevertheless, advanced composites are expected to play an even greater role in future military systems, and DOD will continue to require access to reliable sources of affordable, high-performance fibers including commercial materials and manufacturing processes. As a result of these forecasts, DOD requested the NRC to assess the challenges and opportunities associated with advanced PMCs with emphasis on high-performance fibers. This report provides an assessment of fiber technology and industries, a discussion of R&D opportunities for DOD, and recommendations about accelerating technology transition, reducing costs, and improving understanding of design methodology and promising technologies.

Experimental and Modeling Analysis for Developing Improved Electron Beam Processing Capabilities for Precision Optical Coatings

Download Experimental and Modeling Analysis for Developing Improved Electron Beam Processing Capabilities for Precision Optical Coatings PDF Online Free

Author : Bing Xu
Publisher :
ISBN 13 :
Total Pages : 740 pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Experimental and Modeling Analysis for Developing Improved Electron Beam Processing Capabilities for Precision Optical Coatings by : Bing Xu

Download or read book Experimental and Modeling Analysis for Developing Improved Electron Beam Processing Capabilities for Precision Optical Coatings written by Bing Xu and published by . This book was released on 2007 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Electron beam (E-beam) vacuum deposition is extensively used for the production of multi-layered optical coatings. High precision optical coating designs for advanced applications entail complex layer structures that have tight error tolerances. The ability to achieve those designs while consistently producing large volumes is limited by the current E-beam process control capability. In particular, subliming materials pose significant challenges to obtain high yields for precision optical coatings. The focus of this dissertation is to investigate the critical issue required to develop enhanced E-beam processing capability for subliming materials. The primary material analyzed is fused silica (SiO 2) due to its importance in optical coating manufacturing and challenges in E-beam processing. This work, however, is applicable to other subliming material such as alumina (Al 2 O 3). Deposition rate control and electron beam sweep pattern design are identified as two critical aspects that can be optimized to significantly reduce process variations that lead to coating performance errors. A dynamic model of E-beam silica deposition is developed that captures both the complex process physics and critical equipment characteristics and used to obtain a better understanding of the fundamental sublimation dynamics and to develop improved sweep designs. Experimental characterization of commercial scale systems is performed to reveal major electron gun nonlinearities, important process disturbances, and controller tuning requirements that need to be considered for improving process capability. Model predictions are validated with experimental measurements of steady-state deposition rates, evaporation spot intensity distributions, and dynamic rate responses under the heating of both stationary beam and different sweep patterns. The model is used to understand the influence of sweep design parameters, electron beam focus nonlinearities, and the crucible attributes on the resulting source surface temperature and evaporation distributions. The nonlinear temperature dependences of the source surface thermal and deposition rate dynamics are obtained. The relation of sweep pattern design to the resulting deposition rate dynamics and melt surface uniformity are discussed. Improved deposition rate control strategies are experimentally evaluated and significant process and coating performance improvement is demonstrated.

SAMPE Symposium and Exhibition

Author : Linas Repecka
Publisher : Taylor & Francis
ISBN 13 : 0938994905
Total Pages : 2637 pages
Book Rating : 4.9/5 (389 download)

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Book Synopsis SAMPE Symposium and Exhibition by : Linas Repecka

Download or read book SAMPE Symposium and Exhibition written by Linas Repecka and published by Taylor & Francis. This book was released on 2001 with total page 2637 pages. Available in PDF, EPUB and Kindle. Book excerpt:

New Materials for Next-Generation Commercial Transports

Author : Committee on New Materials for Advanced Civil Aircraft
Publisher : National Academies Press
ISBN 13 : 0309588782
Total Pages : 99 pages
Book Rating : 4.3/5 (95 download)

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Book Synopsis New Materials for Next-Generation Commercial Transports by : Committee on New Materials for Advanced Civil Aircraft

Download or read book New Materials for Next-Generation Commercial Transports written by Committee on New Materials for Advanced Civil Aircraft and published by National Academies Press. This book was released on 1996-03-29 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major objective of this book was to identify issues related to the introduction of new materials and the effects that advanced materials will have on the durability and technical risk of future civil aircraft throughout their service life. The committee investigated the new materials and structural concepts that are likely to be incorporated into next generation commercial aircraft and the factors influencing application decisions. Based on these predictions, the committee attempted to identify the design, characterization, monitoring, and maintenance issues that are critical for the introduction of advanced materials and structural concepts into future aircraft.

SAMPE Symposium and Exhibition

Author : Benjamin M. Rasmussen
Publisher :
ISBN 13 :
Total Pages : 992 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis SAMPE Symposium and Exhibition by : Benjamin M. Rasmussen

Download or read book SAMPE Symposium and Exhibition written by Benjamin M. Rasmussen and published by . This book was released on 2002 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Low Energy Particle Accelerator-Based Technologies and Their Applications

Author : Vlado Valković
Publisher : CRC Press
ISBN 13 : 1000599353
Total Pages : 391 pages
Book Rating : 4.0/5 (5 download)

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Book Synopsis Low Energy Particle Accelerator-Based Technologies and Their Applications by : Vlado Valković

Download or read book Low Energy Particle Accelerator-Based Technologies and Their Applications written by Vlado Valković and published by CRC Press. This book was released on 2022-06-22 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low Energy Particle Accelerator-Based Technologies and Their Applications describes types of low energy accelerators, presents some of the main manufacturers, illustrates some of the accelerator laboratories around the globe and shows examples of successful transfers of accelerators to needed laboratories. Key Features: Presents new trends and the state of the art in a field that's growing Provides an overview of numerous applications of such accelerators in medicine, industry, earth sciences, nuclear non-proliferation and oil Fills a gap, with the author drawing on his own experiences with transporting such relatively large machines from one lab to the other that require a tremendous amount of planning, technical and engineering efforts This is an essential reference for advanced students as well as for physicists, engineers and practitioners in accelerator science. About the Author Dr. Vladivoj (Vlado) Valković, a retired professor of physics, is a fellow of the American Physical Society and Institute of Physics (London). He has authored 22 books (from Trace Elements, Taylor & Francis, 1975, to Radioactivity in the Environment, Elsevier, 1st Edition 2001, 2nd Edition 2019), and more than 400 scientific and technical papers in the research areas of nuclear physics, applications of nuclear techniques to trace element analysis in biology, medicine and environmental research. He has lifelong experience in the study of nuclear reactions induced by 14 MeV neutrons. This research has been done through coordination and works on many national and international projects, including US-Croatia bilateral, NATO, IAEA, EU-FP5, FP6 and FP7 projects. Cover photo credit: 3SDH 1 MV Pelletron system with RF source and analysis endstation designed with the intended purpose of aiding in fusion research. It is capable of Ion Beam Analysis (IBA) techniques such as RBS, ERD, PIXE and NRA. Further detectors could be added to the endstation to allow for other techniques. Installed in Japan in 2014. Courtesy of National Electrostatics Corp.

NASA Technical Memorandum

Author :
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis NASA Technical Memorandum by :

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1990 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

UV Coatings

Author : Reinhold Schwalm
Publisher : Elsevier
ISBN 13 : 0080466893
Total Pages : 323 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis UV Coatings by : Reinhold Schwalm

Download or read book UV Coatings written by Reinhold Schwalm and published by Elsevier. This book was released on 2006-12-21 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since UV curing (light induced polymerisation of multifunctional oligomers) is a very ecoefficient and energy saving curing method, the growth rates of UV curable coatings are in the range of 10% per year. The typical UV coatings are solvent free (100% solids), thus helping the industry and the environment to reduce significantly VOC (volatile organic compounds). Recently, the automotive industry has discovered that UV cured coatings are very scratch resistant, which stimulated very extensive work into the development of UV coatings for automotive applications. Since UV curing is very universal, also other systems besides the 100% solid (typical) UV coatings are developed, like waterbased UV- , UV powder and Dual cure (UV and thermal) systems. UV Coatings contains an overview of the technology, the curing process including the equipment necessary, the raw materials (resins, diluents, photoinitiators) used, the advantages and drawbacks of this fast emerging technology, as well as proposed technical solutions to tackle the disadvantages. Structure-property relationships will be given, especially regarding the mechanical properties of coatings as well as scratch resistance, mainly dealing with automotive performance criteria. The main part of the book will deal with new developments, like water-based UV coatings, UV powder coatings and dual cure systems, cured by UV and thermal energy, which have been developed to cure the coating on three dimensional substrates in shadow areas. The main applications of UV Coatings will be described, starting with the classical ones on temperature sensitive substrates, like wood, paper and plastics, where the UV curable coatings are already well established. * Looking at UV curing as a key to scratch resistant automotive clear coats * Ecoefficiency of UV Coatings * Comprehensive overview of the technology, materials and markets