Download or read book Numerical Analyses of Penetration Dynamics in Support of Investigations of Scaling Relations for Earth Penetrators written by Mark H. Wagner and published by . This book was released on 1977 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two finite-difference WAVE-L code solutions of projectile penetration have been conducted to assess the effect of projectile sectional pressure (W/A) on penetration dynamics. The results are being used in an investigation of penetration scaling relations underway at the Waterways Experiment Station. The penetrator problems consisted of the normal impacts of rigid-body projectiles into sand targets at a velocity of 200 ft/sec. The projectiles were 6 in. in diameter with a 6-in. long, ogive nose (CRH = 1.25). Two penetrator weights were selected, 141.4 lb (Case 1) and 424.1 lb (Case 2), to give projectile sectional pressures of 5 psi for Case 1 and 15 psi for Case 2. Detailed results of the numerical solutions, including time histories of the penetration dynamics variables, force loading distributions, and field plots of the target response, are presented in the report.
Download or read book Rapid Penetration into Granular Media written by Magued Iskander and published by Elsevier. This book was released on 2015-07-10 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid Penetration into Granular Media: Visualizing the Fundamental Physics of Rapid Penetration introduces readers to the variety of methods developed to visualize, observe, and model the rapid penetration of natural and man-made projectiles into earth materials while providing seasoned practitioners with a standard reference that showcases the topic's most recent developments in research and application. There has been a flurry of recently funded research both in the U.S. and Europe on studying the behavior of projectiles in granular media. This book compiles the findings of recent research on the subject and outlines the fundamental physics of rapid earth penetration, and assembles a comprehensive collection of experimental and numerical techniques to study the problem. - Presents a comprehensive interdisciplinary review of the latest research developments in the response of granular media to impact and impulsive loading - Combines the experience of prominent researchers from different disciplines focusing on the challenges presented by impact loading of granular media - Introduces recently developed methods for visualizing the fundamental physics of rapid penetration into granular media
Download or read book Summary of Numerical Analyses of the Effect of W A in Earth Penetration written by Mark H. Wagner and published by . This book was released on 1978 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of three finite-difference WAVE-L code solutions of projectile penetration has been conducted to assess the effect of projectile sectional pressure (W/A) on penetration dynamics. The analysis of the third case is presented in this report, using comparisons with the results of the first two cases, which were analyzed in a previous program. The program results are being used in an investigation of penetration scaling relations under way at the U.S. Army Engineer Waterways Experiment Station.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1204 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 Government Reports Annual Index written by and published by . This book was released on 1975 with total page 882 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 1992-12 with total page 2022 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Finite Difference Code Analyses of Earth Penetrator Dynamics in Rock Media written by M. H. Wagner and published by . This book was released on 1976 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical analyses of penetration dynamics have been performed in support of a program to develop technology for earth penetrating weapons. The emphasis in this program has been to apply calculational techniques to the analysis of projectile penetrations in rock media. Observations from penetrator firings into rock show that there is a region of highly comminuted rock surrounding the penetrator and the penetrator cavity. Since the penetration dynamics are sensitive to the physical properties of the material next to the penetrator, it becomes important to account for the breakup and fracture of the rock in the analysis techniques. Accordingly, material models were developed that included fracture and a post-fracture process which degrades the physical properties to that of a comminuted rock. The penetration analyses were performed with WAVE-L, a two-dimensional Lagrangian finite-difference code. A decoupled calculational method is employed, wherein the penetrator is treated as a rigid body to compute the penetration dynamics. Using the force loadings on the penetrator obtained from this solution, subsequent analysis may be made of the interior response of the penetrator. To test and demonstrate the code, pre-event calculations of a specific rock penetration field test were made. The field experiment consisted of the vertical firing of a 400 pound steel penetrator into a massive welded tuff site at a velocity of 1500 ft/sec. (Author).
Download or read book Three Dimensional Numerical Analyses of Earth Penetration Dynamics written by Y. Marvin Ito and published by . This book was released on 1979 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new three-dimensional numerical code, TRIFLE, is described which provides, for the first time, a rigorous yet efficient analytical tool to investigate the penetration dynamics of semi-rigid projectiles under asymmetric (non-normal) impact conditions. This is a key development since most real impacts and penetrations involve at least some degree of both yaw and obliquity, and since small degrees of asymmetry can have significant effects on the design environment of earth penetrating systems. In the TRIFLE code formulation, the full three-dimensional equations of motion are solved using a moving polar cylindrical coordinate reference frame aligned with the projectile, a Fourier representation of circumferential variation to couple together several r-z finite-difference planes in the target media, an arbitrary Lagrangian/Eulerian transformation to allow these planes to remain planes, and a momentum exchange procedure to determine forces on the penetrator. The circumferential Fourier representation in TRIFLE provides highest resolution near the penetrator, and hence, TRIFLE is more efficient and practical than a three-dimensional cartesian finite-difference formulation.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Velocity Impact Phenomena written by Ray Kinslow and published by Elsevier. This book was released on 2012-12-02 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-Velocity Impact Phenomena covers a wide range of pertinent topics dealing with impact phenomena. The book discusses hypervelocity accelerators; stress wave propagation in solids; and the theory of impact. The text also describes the application of the theory of impact on thin targets and shields and correlation with experiment; the numerical evaluation of hypervelocity impact phenomena; and analytical studies of impact-generated shock propagation. The equation of state of solids from shock wave studies; metallurgical observations and energy partitioning; and engineering considerations in hypervelocity impact are also encompassed. Design engineers will find the book invaluable.
Download or read book Regions and Powers written by Barry Buzan and published by Cambridge University Press. This book was released on 2003-12-04 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book develops the idea that since decolonisation, regional patterns of security have become more prominent in international politics. The authors combine an operational theory of regional security with an empirical application across the whole of the international system. Individual chapters cover Africa, the Balkans, CIS Europe, East Asia, EU Europe, the Middle East, North America, South America, and South Asia. The main focus is on the post-Cold War period, but the history of each regional security complex is traced back to its beginnings. By relating the regional dynamics of security to current debates about the global power structure, the authors unfold a distinctive interpretation of post-Cold War international security, avoiding both the extreme oversimplifications of the unipolar view, and the extreme deterritorialisations of many globalist visions of a new world disorder. Their framework brings out the radical diversity of security dynamics in different parts of the world.
Download or read book Petroleum Abstracts written by and published by . This book was released on 1979 with total page 1268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Weapons Earth Wars written by Robert Preston and published by Rand Corporation. This book was released on 2002-02-13 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This overview aims to inform the public discussion of space-based weapons by examining their characteristics, potential attributes, limitations, legality, and utility. The authors do not argue for or against space weapons, nor do they estimate the potential costs and performance of specific programs, but instead sort through the realities and myths surrounding space weapons in order to ensure that debates and discussions are based on fact.
Download or read book A Directory of Computer Software Applications written by and published by . This book was released on 1978 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Directory of Computer Software Applications Civil Structural Engineering 1978 September 1980 written by United States. National Technical Information Service and published by . This book was released on 1981 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Directory of Computer Software Applications Civil Structural Engineering 1978 September 1980 written by and published by . This book was released on 1981 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
