Download or read book Environmental Durability of Graphite epoxy Composites written by Christopher C. Pauly and published by . This book was released on 2002 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing acceptance and incorporation of fiber-reinforced polymer matrix composites (PMCs) as engineering construction materials have led many to look to the infrastructure as an application for these versatile materials. One such system is pultruded graphite fiber-reinforced epoxy (graphite/epoxy). Some PMC systems degrade when subjected to environmental conditions (e.g., moisture, stress, UV light, electrochemical polarization). These variables are typically studied either singularly or in series, but in real applications (e.g., aerospace, marine, infrastructure), these materials are subjected to many of these conditions simultaneously. To simulate field conditions, this study investigated the combined effects of an aqueous environment, electrochemical polarization, and applied bending stress on the durability of a pultruded graphite/epoxy composite. The findings indicate that graphite/epoxy composites cannot be assumed to be insensitive to degradation by environmental variables. Further, electrochemical polarization, as might occur with contact with a metal such as a fastener, can accelerate degradation. This damage requires the presence of moisture. Chloride and sulfate concentrations in rain are sufficient to establish an electrolyte within creviced regions, but deicing salts would overtake these as a contributor to conductivity. Further findings may be summarized as follows: 1.) Application of polarization in an aerated 0.6M NaCl environment led to breakdown of the fiber/matrix interface. The high pH environment created during the oxygen reduction reaction was necessary but not sufficient to create this breakdown, as the unpolarized specimen exposed to a pH 13 environment did not degrade. Cathodic polarization as would occur by coupling to steel or aluminum is required. 2.)Application of cathodic polarization did not significantly alter strength. Average measurements of shear strength, however, did decrease with the application of cathodic polarization for 70 and 90 days.
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 Technical Abstract Bulletin written by and published by . This book was released on 1979 with total page 1186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Defects and Damage in Composite Materials and Structures written by Rikard Benton Heslehurst and published by CRC Press. This book was released on 2014-04-21 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advantages of composite materials include a high specific strength and stiffness, formability, and a comparative resistance to fatigue cracking and corrosion. However, not forsaking these advantages, composite materials are prone to a wide range of defects and damage that can significantly reduce the residual strength and stiffness of a structu
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Composites in a Marine Environment written by Peter Davies and published by Springer Science & Business Media. This book was released on 2013-10-31 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites are widely used in marine applications. There is considerable experience of glass reinforced resins in boats and ships but these are usually not highly loaded. However, for new areas such as offshore and ocean energy there is a need for highly loaded structures to survive harsh conditions for 20 years or more. High performance composites are therefore being proposed. This book provides an overview of the state of the art in predicting the long term durability of composite marine structures. The following points are covered: • Modelling water diffusion • Damage induced by water • Accelerated testing • Including durability in design • In-service experience. This is essential reading for all those involved with composites in the marine industry, from initial design and calculation through to manufacture and service exploitation. It also provides information unavailable elsewhere on the mechanisms involved in degradation and how to take account of them. Ensuring long term durability is not only necessary for safety reasons, but will also determine the economic viability of future marine structures.
Download or read book Durability of Composites for Civil Structural Applications written by Vistasp M. Karbhari and published by Elsevier. This book was released on 2007-07-25 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the increasing use of fibre-reinforced polymer (FRP) composites in structural civil engineering, there is a vital need for critical information related to the overall durability and performance of these new materials under harsh and changing conditions. Durability of composites for civil and structural applications provides a thorough overview of key aspects of the durability of FRP composites for designers and practising engineers.Part one discusses general aspects of composite durability. Chapters examine mechanisms of degradation such as moisture, aqueous solutions, UV radiation, temperature, fatigue and wear. Part two then discusses ways of using FRP composites, including strengthening and rehabilitating existing structures with FRP composites, and monitoring techniques such as structural health monitoring.Durability of composites for civil and structural applications provides practising engineers, decision makers and students with a useful and fundamental guide to the use of FRP composites within civil and structural engineering. - Provides a thorough overview of key aspects of the durability of composites - Examines mechanisms of degradation such as aqueous solutions, moisture, fatigue and wear - Discusses ways of using FRP composites, including strengthening and rehabilitating existing structures
Download or read book Research in progress written by United States. Army Research Office, Research Triangle Park, N.C. and published by . This book was released on 1978 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reinforced Plastics Durability written by Geoffrey Pritchard and published by CRC Press. This book was released on 1999-01-14 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced plastics are becoming widely adopted for long-term structural use-in everything from buildings and bridges to boats and swimming pools. However, the lifetimes being sought are far greater than the whole history of reinforced plastics production! Reinforced Plastics Durability explores the strength and weathering characteristics which make the material ideal for numerous applications, but also alerting the user of wear and corrosion-with studies of the processes and mechanisms which cause the deterioration. Written especially for first-time users of reinforced plastics-engineers, designers, and managers alike-Reinforced Plastics Durability offers substantial introductory information with key concepts. Subsequent chapters examine the long-term threats to the integrity of reinforced plastics: outdoor weathering, solvent/water attack, high temperatures, and repetitive stress. To maximize durability, contributors to the book report on experience with specific applications over time; the possibility of repair; and use of computer techniques to predict durability. Despite mentioning many possible threats to durability, Reinforced Plastics Durability emphasizes the fact that reinforced plastics composites have performed very well in most of the application areas. Readers will be able to take advantage of that success-and to possibly take steps toward the next phase of refinements and improvements.
Download or read book Nontraditional Methods of Sensing Stress Strain and Damage in Materials and Structures written by David A. Stubbs and published by ASTM International. This book was released on 1997 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: These facsimiles of 16 contributions from the symposium held in May 1996 in Orlando provide information on the behavior of materials and structures. The authors describe novel ways to measure point to point deformation (or strain, when normalized), procedures for measuring crack length and the stres
Download or read book Proceedings of Conference Environmental Degradation of Engineering Materials October 10 12 1977 College of Engineering Virginia Tech Blacksburg Virginia written by M. R. Louthan and published by . This book was released on 1977 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Epoxy Fiber Composites written by Sanjay Mavinkere Rangappa and published by Springer Nature. This book was released on 2022-08-01 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook presents the current state-of-knowledge in the area of epoxy fiber composites. The book emphasizes new challenges and covers synthesis, characterization, and applications of epoxy/fiber composites. Leading researchers from industry, academy, government and private research institutions across the globe have contributed to this book. The contents comprehensively cover the current status, trends, future directions, and application opportunities in the field. This highly application-oriented handbook will be of use to researchers and professionals alike.
Download or read book High Temperature and Environmental Effects on Polymeric Composites written by Charles E. Harris and published by ASTM International. This book was released on 1993 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerospace and naval applications of polymers in conditions once thought too harsh for them, take center stage in the survey of how polymer composites react to environmental conditions. A dozen papers from a symposium in San Diego, October 1991, describe damage mechanisms and failure, materials behavior under combined effects, and constitutive models, sometimes considering polymers as a whole, but more often specific groups or composites. No index. Annotation copyright by Book News, Inc., Portland, OR.
Download or read book Composite Materials written by S. W. Tsai and published by ASTM International. This book was released on 1979 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Composites for Extreme Environments written by N. R. Adsit and published by ASTM International. This book was released on 1987 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Effects in Polymers and Polymeric Composites written by Y. Jack Weitsman and published by Springer Science & Business Media. This book was released on 2011-11-18 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid Effects in Polymers and Polymeric Composites, written by the late Dr. Y. Jack Weitsman, addresses the wide range of parameters that affect the interaction of fluids with polymers and polymeric composites. The book aims at broadening the scope of available data, mostly limited up to this time to weight-gain recordings of fluid ingress into polymers and composites, to the practical circumstances of fluctuating exposure. Various forms of experimental data are given, in conjunction with theoretical models derived from basic scientific principles, and correlated with severity of exposure conditions and interpreted by means of rationally based theoretical models. The practical implications of the effects of fluids are discussed. The issue of fluid effects on polymers and polymeric composites is of concern to engineers and scientists active in aerospace and naval structures, as an increasing portion of these structures are made of polymeric composites and employ polymeric adhesives as a joining device. While the book is intended for this audience, it will also interest researchers and graduate students interested in the mechanics and materials aspects of this matter.
Download or read book Composites for Extreme Environments written by A. Adsit and published by ASTM International. This book was released on 1982 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
