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in subjects: "Projectiles"

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Numerical simulations of gun-launched kinetic energy projectiles subjected to asymmetric projectile base pressure

Three-dimensional numerical simulations were performed to determine the effect of an asymmetric base pressure on kinetic energy projectiles during launch. A matrix of simulations was performed in two separate launch environments. One launch environment represented a severe lateral load environment, while the other represented a nonsevere lateral load environment based on the gun tube straightness. The orientation of the asymmetric pressure field, its duration, the projectile's initial position,… more

Date: January 1, 1991

Creator: Rabern, D.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Explosive shaped charge penetration into tuff rock

Analysis and data for the use of Explosive Shaped Charges (ESC) to generate holes in tuff rock formation is presented. The ESCs evaluated include Conical Shaped Charges (CSC) and Explosive Formed Projectiles (EFP). The CSCs vary in size from 0.158 to 9.1 inches inside cone diameter. The EFPs were 5.0 inches in diameter. Data for projectile impact angles of 30 and 90 degrees are presented. Analytically predicted depth of penetration data generally compared favorably with experimental data. Predi… more

Date: October 1, 1988

Creator: Vigil, M.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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AC-130H Gunship Armor Upgrade Project

This report covers the test methods and equipment for testing aircraft armor both hard and soft. The hard armor are the typical ceramic type while the soft armor are various types of layered composite materials. 10 figs. (JEF)

Date: September 19, 1990

Creator: Shell, T. E. & Landingham, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Investigation of electromagnetic launcher behavior for impact fusion. Annual report, May 1, 1984-April 30, 1985

The second year of a 4-year program to develop an ultra-high velocity electromagnetic launcher has been completed, with significant progress made in the key technical areas. This lays firmly the cornerstone for major progress in Year 3 of the program. The launcher instrumentation and diagnostics system was developed. More than 20 launcher experiments were conducted using the SUVAC-I augmented launcher system. We tested our novel plasma generation technique using a lithium seeded propellant with… more

Date: May 1, 1985

Creator: Thio, Y. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Devices for launching 0. 1-g projectiles to 150 km/s or more to initiate fusion. Part 2. Railgun accelerators

The possibility of using a railgun accelerator to launch 0.1-g projectiles to hypervelocities (150 km/s or more) to initiate thermonuclear fusion is studied. The analysis revealed that a railgun with a plasma-arc armature is a viable approach to the goal. When calculating the railgun's probable performance, it was discovered that this launch system might possibly be designed to avoid adverse effects from boundary layer drag. An appendix provided by A.C. Buckingham summarizes his calculations th… more

Date: July 6, 1979

Creator: Hawke, R. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Stress fields generated by kinetic energy projectile interaction with ceramic targets

Two-dimensional axisymmetric calculations were performed with the Eulerian hydrocode MESA2D and the Lagrangian structural analysis code PRONTO2D. The calculated stress distributions were compared shortly after impact and found to be similar in magnitude and profile. For certain geometric configurations, the interaction of the kinetic energy penetrators with the ceramic targets produce high compressive principal stresses as well as, significant tensile principal stresses ahead of the projectile/… more

Date: January 1, 1991

Creator: Burkett, M. W. & Rabern, D. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Axially accelerated saboted rods subjected to lateral forces

Considerable effort has been dedicated to ensuring the structural integrity of long rods during axial acceleration, but little work has addressed the subject of lateral acceleration of the sabot/rod package while it is still in-bore. Drysdale states ''Certainly the most pressing unsolved problem facing the projectile designer at the present time does not involve structural integrity directly. Rather it is the development of a methodology which allows the rational design of in-bore configuration… more

Date: January 1, 1989

Creator: Rabern, D.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fabrication of uranium and uranium--titanium alloy penetrators of differential hardnesses

Penetrators of three different hardness levels were fabricated using unalloyed U and U--Ti alloys. Extrusion processes are described along with quenching and swaging. (JRD)

Date: January 1, 1976

Creator: Muller, J. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

HERMES: A Model to Describe Deformation, Burning, Explosion, and Detonation

HERMES (High Explosive Response to MEchanical Stimulus) was developed to fill the need for a model to describe an explosive response of the type described as BVR (Burn to Violent Response) or HEVR (High Explosive Violent Response). Characteristically this response leaves a substantial amount of explosive unconsumed, the time to reaction is long, and the peak pressure developed is low. In contrast, detonations characteristically consume all explosive present, the time to reaction is short, and p… more

Date: November 22, 2011

Creator: Reaugh, J E

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Production of high intensity radioactive beams

The production of radioactive nuclear beams world-wide is reviewed. The projectile fragmentation and the ISOL approaches are discussed in detail, and the luminosity parameter is used throughout to compare different production methods. In the ISOL approach a thin and a thick target option are distinguished. The role of storage rings in radioactive beam research is evaluated. It is concluded that radioactive beams produced by the projectile fragmentation and the ISOL methods have complementary ch… more

Date: April 1, 1990

Creator: Nitschke, J.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD

Initial- and final-state rescattering, neglected in the parton model, have a profound effect in QCD hard-scattering reactions, predicting single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam Tung relation in Drell-Yan reactions, and nuclear shadowing and non-universal antishadowing--leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also discuss the use of diffrac… more

Date: November 12, 2008

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radiation characterization, and exposure rate measurements from cartridge, 105-mm, APFSDS-T, XM774

In response to a recommendation from the Joint Technical Coordinating Group for Munitions Effectiveness, Working Group on Depleted Uranium Munitions, the Department of the Army contracted with Pacific Northwest Laboratory (PNL) to investigate the health physics problems associated with the assembly, storage, and use of 105-mm, APFSDS-T, XM774 ammunition. Each round of this ammunition contains a penetrator rod of 3.4 kg of depleted uranium (DU), which is classified as a radioactive source materi… more

Date: November 1, 1979

Creator: Bartlett, W. T.; Gilchrist, R. L.; Endres, G. W. R. & Baer, J. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Penetration of yawed projectiles

We used computer simulations and experiment to study the penetration of tungsten-alloy projectiles into a thick, armored steel target. These projectiles, with length-to-diameter ratios of 4, strike the target with severe yaws, up to 90{degree}(side-on-impact), such as might be induced in an originally longer projectile by a multiple-spaced plate array. In this study, we focus on the terminal ballistics of these projectiles and ignore how the yaw was induced. We found that the minimum penetratio… more

Date: October 8, 1990

Creator: Reaugh, J.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Terra-Drill program: progress report and program plan. [Prefracturing using 50 caliber steel projectiles]

This report presents the status of the Terra-Drill development program as of May 31, 1976. The Terra-Drill system uses high velocity projectiles to prefracture the rock in front of a conventional rotary bit. The significant progress is reviewed and a long-range program plan is developed to indicate the level of effort required to bring this system to commercial production.

Date: June 1, 1976

Creator: Newsom, M. M.; Alvis, R. L. & Dardick, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Finite element models to predict the structural response of 120-mm sabot/rods during launch

Numerical modeling techniques in two- and three-dimensions were used to predict the structural and mechanical behavior of sabot/rod systems while inbore and just after muzzle exit. Three-dimensional transient numerical simulations were used to predict the rod deformations and states of stress and strain caused by axial and lateral accelerations during launch. The numerical models include the launch tube, recoil motion, and sabot/rod system modeled as it transits the launch tube and exits. The s… more

Date: January 1, 1990

Creator: Rabern, D. A. (Los Alamos National Lab., NM (USA)) & Bannister, K. A. (Army Armament Research and Development Command, Aberdeen Proving Ground, MD (USA). Ballistics Research Lab.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Secondary Neutron-Production Cross Sections from Heavy-IonInteractions between 230 and 600 MeV/nucleon

Secondary neutron-production cross-sections have beenmeasured from interactions of 230 MeV/nucleon He, 400 MeV/nucleon N, 400MeV/nucleon Kr, 400 MeV/nucleon Xe, 500 MeV/nucleon Fe, and 600MeV/nucleon Ne interacting in a variety of elemental and compositetargets. We report the double-differential production cross sections,angular distributions, energy spectra, and total cross sections from allsystems. Neutron energies were measured using the time-of-flighttechnique, and were measured at laborato… more

Date: October 4, 2006

Creator: Heilbronn, L.H.; Zeitlin, C.J.; Iwata, Y.; Murakami, T.; Iwase,H.; Nakamura, T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Devices for launching 0. 1-g projectiles to 150 km/s or more to initiate fusion. Part 1. Magnetic-gradient and electrostatic accelerators

The feasibility of using magnetic-gradient and electrostatic accelerators to launch a 0.1-g projectile to hypervelocities (150 km/s or more) is studied. Such hypervelocity projectiles could be used to ignite deuterium-tritium fuel pellets in a fusion reactor. For the magnetic-gradient accelerator, several types of projectile were studied: shielded and unshielded copper, ferromagnetic, and superconducting. The calculations revealed the superconducting projectile to be the best of those materials… more

Date: May 1, 1979

Creator: Brittingham, J.N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analytical and experimental evaluation of a proposed self-forging fragment munition

Analytical and experimental tools have been used to study the formation of a proposed self-forging fragment projectile. The primary objective of this study is the determination of the interior and exterior shape of the fully formed fragment, and to determine if the fragment tumbles in flight. In addition, it is of interest to compare computer predictions to experimental results. An experiment was performed using high speed photography and high-energy flash x-ray radiography to study liner and c… more

Date: December 27, 1982

Creator: Tuft, D.B. & Folsom, E.N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Adaptation of an Industrial Application for an Instructional Laboratory in Mechanical Vibrations

Extensive theoretical treatment is given to damping as the process of energy dissipation during mechanical vibration. The challenge in the classroom is to adequately convey this concept and extend it by teaching students practical applications in engineering analysis and design. Students are motivated by real-world problems; applying these types of problems with strong instructional classroom content significantly enhances the learning environment. This paper proposes the adaptation of an actua… more

Date: January 1, 1990

Creator: Whiteman, W. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Polarization phenomena in projectile fragmentation process

The nuclear spin polarization of beta-emitting fragments {sup 37}K and {sup 39} Ca has been measured at around the grazing angle of the {sup 40}Ca + Au collision at 106 MeV/u. Momentum dependence of the observed fragment polarization supports the idea that the origin of the polarization is the orbital angular momentum held by the fragment part of the projectile before the collision takes place. The sizable polarization of about 5% that was observed for the fragments will be a powerful tool for … more

Date: March 1, 1992

Creator: Matsuta, K.; Ozawa, A.; Nojiri, Y.; Minamisono, T.; Fukuda, M.; Kitagawa, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Novel QCD Phenomena

I discuss a number of novel topics in QCD, including the use of the AdS/CFT correspondence between Anti-de Sitter space and conformal gauge theories to obtain an analytically tractable approximation to QCD in the regime where the QCD coupling is large and constant. In particular, there is an exact correspondence between the fifth-dimension coordinate z of AdS space and a specific impact variable {zeta} which measures the separation of the quark constituents within the hadron in ordinary space-t… more

Date: July 6, 2007

Creator: Brodsky, Stanley J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Odd-Z Transactinide Compound Nucleus Reactions Including the Discovery of 260Bh

Several reactions producing odd-Z transactinide compound nuclei were studiedwith the 88-Inch Cyclotron and the Berkeley Gas-Filled Separator at the LawrenceBerkeley National Laboratory. The goal was to produce the same compound nucleus ator near the same excitation energy with similar values of angular momentum via differentnuclear reactions. In doing so, it can be determined if there is a preference in entrancechannel, because under these experimental conditions the survival portion of Swiatec… more

Date: May 14, 2008

Creator: Nelson, Sarah L & Nelson, Sarah L

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Benchmarking numerical predictions with force and moment measurements on slender, supercavitating bodies

High-speed water-entry is a very complex, dynamic process. As a first attempt at modeling the process, a numerical solution was developed at Sandia National Laboratories for predicting the forces and moments acting on a body with a steady supercavity, that is, a cavity which extends beyond the base of the body. The solution is limited to supercavities on slender, axisymmetric bodies at small angles of attack. Limited data were available with which to benchmark the axial force predictions at zer… more

Date: January 1, 1991

Creator: Hailey, C.E.; Clark, E.L. & Cole, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Performance of a 100-kV, 78-kJ electric-gun system

A new electric gun system was constructed for use in high-pressure EOS studies. The system is powered by a 100 kV, 15.6 ..mu..F capacitor bank. At 100 kV charging voltage the system inductance is 23 nH. This system has driven 0.3 mm-thick Kapton projectiles to > 20 km/s and 0.3 mm Kapton/30 ..mu..m Ta projectiles to approx. 10 km/s. Projectile velocity is modeled phenomenlogically by an electrical Gurney model.

Date: June 15, 1981

Creator: Chau, H.; Dittbenner, G.; Mikkelsen, K.; Weingart, R.; Froeschner, K. & Lee, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department