Download or read book Environmental Effects on the Deformation of Polymers at Low Temperatures written by Norman Brown and published by . This book was released on 1977 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanical properties of every linear polymer are affected by liquid and gaseous nitrogen, Argon, and oxygen if the temperature is less than about 70 degrees above the boiling point. The tensile strength decreases and the creep rate increases with respect to an increase in the surface concentration of the gas. The surface concentration is related to the pressure and temperature by the parameter peQ/RT where Q was about equal to the heat of vaporization of the gas. The usual effect of the gas was to produce crazes. About 12 gases were tested and the only two gases that had no effect were helium and hydrogen because they have low heats of vaporization. The range of the experiments were from 78K to the glass transition temperature. The mechanical behavior was also found to depend on the size and shape of the specimen as measured by area per unit volume because crazes usually nucleate at the surface. It was found that the macroscopic mechanical behavior could be quantitatively derived from the measurable microscopic parameters of the crazes. The pressure range of 0-1 atmospheres was investigated. (Author).
Download or read book Research in Progress written by and published by . This book was released on 1975 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Behavior of Materials Temperature effects of metals Environmental effects Polymers written by and published by . This book was released on 1972 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Going to Extremes written by National Research Council and published by National Academies Press. This book was released on 2005-10-22 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced polymer matrix composites (PMC) have many advantages such as light weight and high specific strength that make them useful for many aerospace applications. Enormous uncertainty exists, however, in predicting long-term changes in properties of PMCs under extreme environmental conditions, which has limited their use. To help address this issue, the Department of Defense requested a study from the NRC to identify the barriers and limitations to the use of PMCs in extreme environments. The study was to focus on issues surrounding methodologies for predicting long-term performance. This report provides a review of the challenges facing application of PMCs in extreme environments, the current understanding of PMC properties and behavior, an analysis of the importance of data in developing effective models, and recommendations for improving long-term predictive methodologies.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deformation of Polymers written by and published by . This book was released on 1973 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deformation of linear polymers polymers was investigated from three viewpoints (1) the microscopic, involved measurements of free volume and the relationship of the intermolecular forces to the yield point, (2) the phenomenological, involved the prediction of non-linear viscoelastic programs of deformation in terms of the creep curves, and (3) environmental crazing at low temperatures, involved the effects of gases on the tensile deformation. Experiments and theories concerning these three viewpoints are presented.
Download or read book Localized Deformation of Polymers at Low Temperatures and High Loading Rates written by John Duncan Williams and published by . This book was released on 1978 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Phenomena in the Structural and Mechanical Behaviour of Solid Polymers written by L. Volynskii and published by CRC Press. This book was released on 2018-09-03 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Phenomena in the Structural and Mechanical Behaviour of Solid Polymers explores the role of various surface phenomena in the structural and mechanical behaviour of amorphous and semicrystalline polymers. This book: Discusses the development of the interfacial surface in the deformation of polymers Examines the healing of interfacial surfaces in polymers Inspects the structure and properties of polymers in thin films and surface layers Evaluates the mechanism of inelastic deformation in glassy amorphous polymers Investigates strain softening and the phenomena taking place upon deformation of polymers in active liquid media Covers the Rehbinder effect, or the adsorption reduction of the strength of solids Describes the properties of polymers in environmental or solvent crazing Analyses the interaction of the highly developed surface of crazed polymers with diverse low- and high-molecular mass components Addresses the instability and self-organisation of surface layers in polymers and diverse polymer systems Presents theoretical speculations concerning the structurally mechanical behaviour of ‘a rigid coating on a soft substratum’ (RCSS) systems Assesses the stress–strain properties of the thin surface layers of polymers and the nanometric coatings deposited on their surfaces Highlights the efficacy of the approaches developed for RCSS systems for the analysis and description of natural phenomena Details the applied aspects of surface phenomena in the structurally mechanical behaviour of polymers Thus, Surface Phenomena in the Structural and Mechanical Behaviour of Solid Polymers provides a useful framework for the development of new and innovative polymer-based materials.
Download or read book Polymers at Cryogenic Temperatures written by Susheel Kalia and published by Springer Science & Business Media. This book was released on 2013-03-26 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kalia and Fu's novel monograph covers cryogenic treatment, properties and applications of cryo-treated polymer materials. Written by numerous international experts, the twelve chapters in this book offer the reader a comprehensive picture of the latest findings and developments, as well as an outlook on the field. Cryogenic technology has seen remarkable progress in the past few years and especially cryogenic properties of polymers are attracting attention through new breakthroughs in space, superconducting, magnetic and electronic techniques. This book is a valuable resource for researchers, educators, engineers and graduate students in the field and at technical institutions.
Download or read book Environmental Effects on Materials and Equipment written by and published by . This book was released on 1962 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning in 1962 issued in sections A and B.
Download or read book The Physics of Deformation and Fracture of Polymers written by A. S. Argon and published by Cambridge University Press. This book was released on 2013-03-07 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: A physical, mechanism-based presentation of the plasticity and fracture of polymers, covering industrial scale applications through to nanoscale biofluidic devices.
Download or read book Plastic Deformation of Polymers written by Anton Peterlin and published by Marcel Dekker. This book was released on 1971 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 2006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalog of National Bureau of Standards Publications 1966 1976 written by United States. National Bureau of Standards. Technical Information and Publications Division and published by . This book was released on 1978 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalog of National Bureau of Standards Publications 1966 1976 pt 1 2 Key word index written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Polymers Abstracts written by and published by . This book was released on 1996 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene written by T. T. Jones and published by Elsevier. This book was released on 2013-10-22 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene presents the results of a study that investigated the effect of molecular orientation on the mechanical properties of polystyrene. Oriented sheets of two commercial homopolystyrenes (PSA and PSB) differing in molecular weight, rheological and glass transition temperature properties were prepared by sheet extrusion and drawing. The properties of the resulting sheets were examined at seven different laboratories in Europe. The study focused on length reversion ratio, birefringence, orientation stress, shrinkage stress, and various mechanical properties such as rupture stress and strain, the specific energy of rupture, and sonic modulus and relaxation modulus. Impact behavior and environmental stress cracking behavior were also evaluated. One of the findings was that oriented polymers subjected to lateral strains can develop catastrophic crack growth when immersed in an active liquid. The onset of the cracks depends on the lateral strain imposed as well as the degree of orientation. PSB was more resistant than PSA. This monograph should be a useful resource for chemists.
