Download or read book Surface Melting of Rotating Bands written by and published by . This book was released on 1975 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The point at which a complete molten film is formed on the surface of projectile rotating bands is very important because, when it is formed, sliding becomes lubricated and friction determined by hydrodynamic considerations alone. Furthermore, beyond this point, wear of a particular band material is dependent only on the amount of heat transferred to it. The first formation of the molten surface film for projectiles with gilding metal bands was estimated by observing the location of the drop in the coefficient of friction. This was reached well before the bands were completely engraved in the case of a 155mm howitzer firing at low zones. It would be reached even more rapidly in the case of tank guns or artillery firing at higher zones.
Download or read book Evidence for the Melt Lubrication of Projectile Bands written by and published by . This book was released on 1983 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the long-time acceptance of melt-lubrication of rotating bands by the Army scientific community, all of the evidence supporting this conclusion has not been collected and, indeed, some has never been published. The melt-lubrication of rotating bands is very important because the sliding is lubricated and friction and wear are determined only by the characteristics of the molten film and the amount of melting at the sliding interface. Melt- lubrication results in much less resistance and much less severe wear than would otherwise be the case. Friction, wear and metallographic evidence from examination of recovered projectiles and fired cannon tubes show the melt- lubrication of projectiles sliding on a gun bore. This melt-lubrication is caused by the production of a thin surface film of molten rotating band material. Such a molten surface layer can also be produced on the surface of materials other than copper alloys contacting the bore at high bearing loads.
Download or read book Projectile Lubrication by Melting Rotating Bands written by and published by . This book was released on 1976 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sliding experiments carried out in the laboratory with a pin-on-disk machine produced appreciably higher coefficients of friction than the actual values measured for projectiles sliding down cannon bores. Although the pin surface melted, the coefficient of friction was at least an order of magnitude higher than expected for liquid film lubrication. The sliders in the laboratory experiments were, of course, much smaller than actual rotating bands and the bearing pressure was limited by distortion of the sliding pin.
Download or read book Friction Science and Technology written by Peter J. Blau and published by CRC Press. This book was released on 2008-10-20 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Should have broad appeal in many kinds of industry, ranging from automotive to computers-basically any organization concerned with products having moving parts!"-David A. Rigney, Materials Science and Engineering Department, Ohio State University, Columbus, USAIn-Depth Coverage of Frictional ConceptsFriction affects so many aspects of daily l
Download or read book The Kolsky Hopkinson Bar Machine written by Ramzi Othman and published by Springer. This book was released on 2018-04-20 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading scientists share their vision on the Kolsky-Hopkinson bar technique, which is a well-established experimental technique widely used to characterize materials and structures under dynamic, impact and explosion loads. Indeed, the Kolsky-Hopkinson bar machine is not a simple experimental device. It is rather a philosophical approach to solve the problem of measuring impact events. The split Hopkinson pressure bar conventional device is mainly limited to test homogeneous ductile non-soft materials under uni-axial compression. Extending the use of this device to more versatile applications faces several challenges such as controlling the stress state within the specimen and mastering the measurement of forces and velocities at the specimen-bar interfaces and then the material properties. Thus, the topics discussed in this book mainly focused on the loading and processing parts.
Download or read book Tribocorrosion of Passive Metals and Coatings written by D Landolt and published by Elsevier. This book was released on 2011-10-12 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tribocorrosion causes the degradation or alteration of materials through the combined action of corrosion and wear. It limits the performance and life-time of installations, machines and devices with moving parts, and controls certain manufacturing processes such as chemical–mechanical polishing. The effects of tribocorrosion are most pronounced on passive metals which owe their corrosion resistance to a thin protecting oxide film. Most corrosion-resistant engineering alloys belong to this category.This book provides an introduction to the developing field of tribocorrosion and an overview of the latest research. Part one reviews basic notions of corrosion and tribology, before presenting the most recent results on the growth and structure of passive oxide films. Tribocorrosion mechanisms under fretting, sliding and erosion conditions, respectively, are then discussed. Part two focuses on methods for measuring and preventing tribocorrosion. It includes chapters on electrochemical techniques, the design of tribocorrosion test equipment, data evaluation and the optimisation of materials' properties for tribocorrosion systems. Part three presents a selection of tribocorrosion problems in engineering and medicine. Three chapters address the tribocorrosion of medical implants including test methods and clinical implications. Other chapters examine tribocorrosion issues in nuclear power plants, marine environments, automotive cooling circuits, elevated-temperature metal working and chemical–mechanical polishing.With its distinguished editors and international team of expert contributors Tribocorrosion of passive metals and coatings is an invaluable reference tool for engineers and researchers in industry and academia confronted with tribocorrosion problems. - Comprehensively reviews current research on the tribocorrosion of passive metals and coatings, with particular reference to the design of tribocorrosion test equipment, data evaluation and the optimisation of materials' properties for tribocorrosion systems - Chapters discuss tribocorrosion mechanisms under fretting, sliding and erosion conditions before focussing on methods for measuring and preventing tribocorrosion - Includes a comprehensive selection of tribocorrosion problems in engineering and medicine, such as the tribocorrosion of medical implants, and tribocorrosion issues in nuclear power plants, marine environments, automotive cooling circuits and elevated-temperature metal working
Download or read book Projecting the Climatic Effects of Increasing Carbon Dioxide written by Michael C. MacCracken and published by . This book was released on 1985 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Tribology written by Gwidon Stachowiak and published by Butterworth-Heinemann. This book was released on 2005-09-07 with total page 831 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excellent graphic approach and simplified text clearly facilitate understanding of this vital engineering discipline.
Download or read book Advances in Heat Transfer written by and published by Academic Press. This book was released on 1994-03-10 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Heat Transfer is designed to fill the information gap between the regularly scheduled journals and university level textbooks, allowing for in-depth review articles on a broader scope than is allowable in either journals or texts. - Reviews recent work on melt lubrication at the interface between two solid parts, one of which is at its melting point - Employs variational principle with vanishing parameter in the study of linear and nonlinear transient heat conduction through bodies of finite length - Reviews heat transfer in porous media and its rapidly growing body of literature - Emphasizes recent developments in handling complex geometry, treating wide flow speed variations, yielding accurate solutions, and producing results efficiently as illustrated throughout with many examples - Discusses unsteady convective situations which are generated in response to the time-dependent boundary conditions on the surface walls of a container, and its practical industrial applications
Download or read book Computational Contact and Impact Mechanics written by Tod A. Laursen and published by Springer Science & Business Media. This book was released on 2003-05-12 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many physical systems require the description of mechanical interaction across interfaces if they are to be successfully analyzed. Examples in the engineered world range from the design of prosthetics in biomedical engi neering (e. g. , hip replacements); to characterization of the response and durability of head/disk interfaces in computer magnetic storage devices; to development of pneumatic tires with better handling characteristics and increased longevity in automotive engineering; to description of the adhe sion and/or relative slip between concrete and reinforcing steel in structural engineering. Such mechanical interactions, often called contact/impact in teractions, usually necessitate at minimum the determination of areas over which compressive pressures must act to prevent interpenetration of the mechanical entities involved. Depending on the application, frictional be havior, transient interaction of interfaces with their surroundings (e. g. , in termittent stick/slip), thermo-mechanical coupling, interaction with an in tervening lubricant and/or fluid layer, and damage of the interface (i. e. , wear) may also be featured. When taken together (or even separately!), these features have the effect of making the equations of mechanical evolu tion not only highly nonlinear, but highly nonsmooth as well. While many modern engineering simulation packages possess impressive capabilities in the general area of nonlinear mechanics, it can be contended that methodologies typically utilized for contact interactions are relatively immature in comparison to other components of a nonlinear finite element package, such as large deformation kinematics, inelastic material modeling, nonlinear equation solving, or linear solver technology.
Download or read book Ballistics 2011 written by Ernest Baker and published by DEStech Publications, Inc. This book was released on 2011-09 with total page 2230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes papers that were first presented at a September 2011 conference organized by the National Defense Industrial Association and the International Ballistics Society. This title includes a CD-ROM that displays figures and illustrations in articles in full color along with a title screen and main menu screen.
Download or read book Engineering Tribology written by Gwidon W. Stachowiak and published by Elsevier. This book was released on 2001 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanisms of wear, friction and lubrication are comprehensively described in an accessible manner that is designed to be helpful to non-specialists. The control of wear is given extensive treatment with a thorough discussion of lubricant additives, solid lubricants and surface coatings. The effectiveness of coatings in suppressing specific forms of wear is described together with the methods of coating deposition. More than 1000 references are provided to give the reader access to more specialized information if required.
Download or read book Ammunition Demystified written by Jeff Siewert and published by Page Publishing Inc. This book was released on 2022-04-25 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ammunition, Demystified is Hatcher’s Notebook for the twenty-first century. It’s a “soft” technical document intended for small caliber ammunition design and production engineers, as well as more advanced shooters and reloaders who want a more in-depth understanding of how guns and ammunition work and interact with one another. There is very little that is truly simple about small arms ammunition due to the enormous stresses to which the bullet and cartridge case structures are subjected during the firing process and the nonlinear material properties of these ammunition components. Ammunition Demystified untangles these interactions and will help put you on the path of increased understanding of a simple yet complex topic. This book encapsulates the technical knowledge acquired on bullets, cartridge cases, barrels, and ammunition testing over a career spanning four decades. It is a useful reference for shooters, reloaders, and “ammo guys” to assist them when they troubleshoot the mechanical and dispersion performance of their firearms and ammunition. Ammunition Demystified topics covered are • cartridge cases and case-chamber interaction • propellants and interior ballistics • projectile design, aerodynamics, and stability • trajectory, dispersion, accuracy • barrel: manufacture, fatigue life • ammunition: pressure and velocity testing, and load development www.bulletology.com
Download or read book Gun Propulsion Technology written by Ludwig Stiefel and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1988 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Official Gazette of the United States Patent and Trademark Office written by United States. Patent and Trademark Office and published by . This book was released on 2001 with total page 1438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Purity Silicon VI written by Electrochemical Society. Meeting and published by The Electrochemical Society. This book was released on 2000 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: "... papers that were presented at the Sixth Symposium on High Purity Silicon held in Phoenix, Arizona at the 198th Meeting of the Electrochemical Society, October 22-27, 2000."--Preface.
Download or read book Wear of Materials written by American Society of Mechanical Engineers and published by . This book was released on 1979 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
