Download or read book Friction of Rotating Band Material During Engraving and Initial Projectile Travel written by R. S. Montgomery and published by . This book was released on 1978 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sliding characteristics and coefficients of friction of rotating band and potential rotating band material on steel were studied in the laboratory at velocities corresponding with projectile velocities near the origin-of-rifling. The band materials investigated were gilding metal, 7075 aluminum alloy, AZ61A magnesium alloy, sintered iron, soft iron, nylon 6-6, and vulcanized fiber. It is possible to draw a number of conclusions and make a number of conjectures about the engraving and initial travel of cannon projectiles from the results of this study. A comparison of the different sliding characteristics and laboratory friction coefficients provides insight into the behavior of projectiles and will help to allow the design of rotating bands without the expensive extensive firing of an actual cannon. (Author).
Download or read book Analysis of Engraving and Wear in a Projectile Rotating Band written by Peter Chen and published by . This book was released on 1999 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large deformation analysis of the engraving process and wear in a projectile rotating band is considered by using the finite element program ABAQUS. The tube and the projectile are assumed to be rigid. and the bore of the tube is assumed to be smooth and axisymmetric. An elastic-plastic material model is chosen for the copper band, which remains attached to the projectile, and an appropriate coefficient of sliding friction is chosen. The magnitude and distribution of the contact pressure between the band and the tube are obtained during engraving. The band pressure is large with severe plastic deformation occurring in the band.
Download or read book Wear of Materials 1983 written by K. C Ludema and published by . This book was released on 1983 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wear of Materials written by American Society of Mechanical Engineers and published by . This book was released on 1983 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The U S 37 mm Gun in World War II written by Charles C Roberts and published by Casemate. This book was released on 2023-11-30 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed history of the most widely used 37-mm gun of WWII and its applications. Developed in response to the 1899 Hague Convention, the 37-mm gun met the restrictions on the size of weapons that could fire explosive shells, yet was also light and lethal enough to be used in battle. After World War I, in which the French Model 1916 37-mm was used extensively, several countries developed or adopted the 37-mm gun. Behind in their development of an antitank gun, the United States relied on the German Pak 36 37-mm design as a basis for development. By the mid 1930s, the US Ordnance Department designed the M3 37-mm gun and M4 carriage resulting in a towed antitank gun, the first antitank gun in the US Army. This gun proved effective at the beginning of World War II, but as German armor protection increased, it could not penetrate the frontal armor of many German tanks and was relegated to lesser roles. However, the gun proved effective against the Japanese tanks and Japanese strong points in the Far East. The US military used the gun on several production and experimental armored vehicles including the M3 Lee Medium Tank, the M3 Stuart Light Tank, the M5 Stuart Light Tank, the M8 Armored Car, the T17E1 Staghound Armored Car and the M3A1E3 Scout Car. The gun was also used on several non-armored vehicles, the P39 Aeracobra, and selected naval vessels. Despite its small size, the US M3 37-mm gun served throughout the war, on many vehicles and performed exactly as designed. Fully illustrated, this is the first complete account of the development and use of the US 37-mm gun in World War II.
Download or read book Wear of Projectile Rotating Bands written by R. S. Montgomery and published by . This book was released on 1985 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotating or driving bands are bands relatively soft materials surrounding a projectile. They have a number of functions the chief of which is probably that they produce stabilizing rotating of the projectile when they are engraved or keyed into the rifling. These bands are used on spin-stabilized projectiles as small as 20 mm caliber, but this discussion concerns especially the larger cannon, i.e., in excess of 105 mm. Excess wear of projectile rotating bands has a number of important negative consequences including inaccuracy and short rounds. There are two distinctly different mechanisms of wear. At low speeds near the beginning of motion, wear is by adhesion, abrasion, and even under some conditions, scuffing. After a few centimeters of sliding, a thin surface film of molten band material is formed and the remainder of the sliding is melt-lubricated. While metal-on-metal sliding is limited to the first few centimeters, it is very important and can result in serious wear problems down bore. The exact wear of rotating bands depends on the motion of the projectile in the bore of the cannon. Therefore, this motion can be inferred from the wear.
Download or read book Modeling of Barrel Projectile Interaction in a Rotating Band written by and published by . This book was released on 2001 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ABAQUS program was used and a refined finite element mesh was chosen to complete the modeling of the barrel/projectile interaction in a rotating band. The calculations for the engraving processes proceeded until the projectile had passed completely through the forcing cone in the land and groove. The axially symmetric cases were considered and the elasticity of the tube and projectile was neglected. Sliding friction was considered and the copper band was either elastic-plastic or ideally plastic. The magnitude and distribution of the contact pressure between the band and the tube were obtained during and after engraving. For the first time we have observed the opening of a gap between the band and the bore after engraving was completed, even when we observed full contact in the forcing cone.
Download or read book 11th International Symposium on Ballistics Propulsion dynamics launch dynamics flight dynamics written by and published by . This book was released on 1989 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1978 with total page 1716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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 Friction and Wear at High Sliding Speeds written by and published by . This book was released on 1975 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The wear of rotating band materials and projectile steel at very high sliding speeds is of great importance in the development of improved cannon. This is especially true for the large caliber, high muzzle velocity weapons where excess wear on the bore near the muzzle can limit their useful lives. An extensive experimental study by The Franklin Institute was supported by the Army from about 1946 to 1956 with a great deal of data collected at sliding speeds up to 1800 fps using a sophisticated high-speed-pin-on-disk test device. These data indicated that the mechanism of wear at high sliding speeds is surface melting followed by subsequent removal of a portion of the melted surface layer. This means that a rotating band material must be high melting if it is to have good wear resistance at high sliding speeds although, of course, wear can be decreased by design changes such as increased bearing area, etc. This does not mean, however, that compatibility, crystal structure, hardness, etc. have no effect because, for a short distance down the bore, the surface of the rotating bands is not completely melted. It could be that excessive bore wear near the muzzle actually is caused by severe wear of the rotating bands occurring near the origin-of-rifling in some cases.
Download or read book Fused on Rotating Bands for Projectiles written by and published by . This book was released on 1974 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was to determine the feasibility of a new idea for applying rotating bands to projectiles. The idea is the in-situ fusion of the rotating band material in a graphite crucible fitted around the projectile. Various heating and shielding methods were explored. It was found that several materials could be successfully deposited using induction or furnace heating in an Argon atmosphere. Metallographic studies and post- application, heat treating studies were carried out. Several bands 'fused on' 30 mm projectiles were successfully fired through a 30 mm cannon.
Download or read book Computers in Engineering 1982 Mesh generation Finite elements Computers in structural optimization Computers in engineering workplace Computers in energy systems Personal computing written by and published by . This book was released on 1982 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computers in Engineering written by and published by . This book was released on 1982 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Artillery Manual Cannon Gunnery written by Department of the Army and published by . This book was released on 2017-08-19 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: Training Circular (TC) 3-09.81, "Field Artillery Manual Cannon Gunnery," sets forth the doctrine pertaining to the employment of artillery fires. It explains all aspects of the manual cannon gunnery problem and presents a practical application of the science of ballistics. It includes step-by-step instructions for manually solving the gunnery problem which can be applied within the framework of decisive action or unified land operations. It is applicable to any Army personnel at the battalion or battery responsible to delivered field artillery fires. The principal audience for ATP 3-09.42 is all members of the Profession of Arms. This includes field artillery Soldiers and combined arms chain of command field and company grade officers, middle-grade and senior noncommissioned officers (NCO), and battalion and squadron command groups and staffs. This manual also provides guidance for division and corps leaders and staffs in training for and employment of the BCT in decisive action. This publication may also be used by other Army organizations to assist in their planning for support of battalions. This manual builds on the collective knowledge and experience gained through recent operations, numerous exercises, and the deliberate process of informed reasoning. It is rooted in time-tested principles and fundamentals, while accommodating new technologies and diverse threats to national security.
Download or read book The Encyclop dia Britannica written by Hugh Chisholm and published by . This book was released on 1926 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
