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Fabrication of uranium and uranium--titanium alloy penetrators of differential hardnesses
Description:
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.
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Phase detonated shock tube (PFST)
Description:
The simple, cylindrically imploding and axially driven fast shock tube (FST) has been a basic component in the high velocity penetrator (HVP) program. It is a powerful device capable of delivering a directed and very high pressure output that has been successfully employed to drive hypervelocity projectiles. The FST is configured from a hollow, high-explosive (HE) cylinder, a low-density Styrofoam core, and a one-point initiator at one end. A Mach stem is formed in the core as the forward-propa…
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Date:
January 1, 1993
Creator:
Zerwekh, W. D.; Marsh, S. P. & Tan, Tai-Ho.
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H-Division quarterly report, April--June 1976. [Lawrence Livermore Laboratory]
Description:
The purview of H-Division is the mechanics of fluids and solid bodies. Concise status reports of the projects undertaken by the various groups in the division are given. Representative topics studied include equations of state of various materials, fracture mechanics, penetration of armor by projectiles, turbulence generation, and the development of dynamics computer codes. 31 figures, 2 tables. (RWR)
Date:
July 14, 1976
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Report
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Terra-Drill program: progress report and program plan. [Prefracturing using 50 caliber steel projectiles]
Description:
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.
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Report
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New LANL Group M-7 two-stage gun: Double-diaphragm and wrap-around gas breech
Description:
A new two-stage gun is being installed in a high explosive testing facility at Los Alamos National Laboratory for the purpose of subjecting insensitive high explosives to controlled projectile impacts so that shock-to-detonation transition can be studied in detail. This gun has been patterned after guns designed by Alois Stilp at Ernst Mach Institut (EMI) in Freiburg and Wintersweiler, Germany. Several changes were made to adapt the design to our needs. The gun has a 100-mm diameter pump tube a…
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Date:
January 1, 1992
Creator:
Sheffield, S. A. & Martinez, A. R.
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Transverse energy scaling and energy density estimates from sup 16 O- and sup 32 S-induced reactions
Description:
We discuss the dependence of transverse energy production on projectile mass, target mass, and on the impact parameter of the heavy ion reaction. The transverse energy is shown to scale with the number of participating nucleons. Various methods to estimate the attained energy density from the observed transverse energy are discussed. It is shown that the systematics of the energy density estimates suggest averages of 2--3 GeV/fm{sup 3} rather than the much higher values attained by assuming Lan…
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Date:
January 1, 1989
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Fluid-structure-interaction analyses of reactor vessel using improved hybrid Lagrangian Eulerian code ALICE-II
Description:
This paper describes fluid-structure-interaction and structure response analyses of a reactor vessel subjected to loadings associated with postulated accidents, using the hybrid Lagrangian-Eulerian code ALICE-II. This code has been improved recently to accommodate many features associated with innovative designs of reactor vessels. Calculational capabilities have been developed to treat water in the reactor cavity outside the vessel, internal shield structures and internal thin shells. The obje…
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Date:
January 1, 1993
Creator:
Wang, C. Y.
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Effectiveness of alumina armor plate against high velocity projectiles
Description:
The thickness of alumina armor plate is determined which will stop a 10-g steel projectile traveling at 2.1 and 3.0 mm/s.
Date:
June 22, 1976
Creator:
Hord, B. L.
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Report
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Dynamic impact analysis of the M1 105mm projectile
Description:
Evaluation of the effects of [open quotes]rough-handling[close quotes]-induced stresses in the nose region of a 105mm artillery projectile was performed to determine if these stresses could have contributed to the premature explosion of a projectile during a Desert Shield training mission of the 101st Army Airborne in Saudi Arabia. The rough-handling evaluations were simulated by dynamic impact analysis. It was concluded that the combined residual stress and dynamic impact-induced stress would …
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Date:
June 1, 1993
Creator:
Walls, J. C. & Webb, D. S.
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Report
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Measurement of Low Level Explosives Reaction in Gauged Multi-Dimensional Steven Impact Tests
Description:
The Steven Test was developed to determine relative impact sensitivity of metal encased solid high explosives and also be amenable to two-dimensional modeling. Low level reaction thresholds occur at impact velocities below those required for shock initiation. To assist in understanding this test, multi-dimensional gauge techniques utilizing carbon foil and carbon resistor gauges were used to measure pressure and event times. Carbon resistor gauges indicated late time low level reactions 200-540…
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Date:
May 31, 2001
Creator:
Niles, A M; Garcia, F; Greenwood, D W; Forbes, J W; Tarver, C M; Chidester, S K et al.
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Photographic instrumentation for the skid test. Period covered: October--December 1976
Description:
Fastax camera film records were obtained on each skid test. The film records are used to: (1) provide an indication of the reaction level obtained, (2) provide an indication of whether the skid test sample (billet) impacted the target properly, (3) provide the final velocity of rotation of the billet after the impact, and (4) provide the coefficient of restitution of the billet after the impact. Items 1 and 2 provide only qualitative data. The reliability of the data obtained in items 3 and 4 i…
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Date:
January 1, 1977
Creator:
Van Velkinburgh, J. H.
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Report
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Plan of Action: JASPER Management Prestart Review (Surrogate Material Experiment)
Description:
The Lawrence Livermore National Laboratory (LLNL) Joint Actinide Shock Physics Experimental Research (JASPER) Facility is being developed at the Nevada Test Site (NTS) to conduct shock physics experiments on special nuclear material and other actinide materials. JASPER will use a two-stage, light-gas gun to shoot projectiles at actinide targets. Projectile velocities will range from 1 to 8 km/s, inducing pressures in the target material up to 6 Mbar. The JASPER gas gun has been designed to matc…
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Date:
December 5, 2000
Creator:
Cooper, W E
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High Explosive Deonation Threshold Sensitivity Due to Multiple Fragment Impacts
Description:
Fragments, bullets or projectiles can initiate a detonation in a high explosive (HE). For this to happen certain critical conditions need to be exceeded. For a given explosive, these critical conditions are the projectile velocity, the projectile size and shape, and the projectile material properties. A lot of work has been done in the area of metal shaped charge jets and individual fragments impacting the HE. One major gap in understanding initiation phenomena is the effect of multiple fragmen…
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Date:
January 7, 2004
Creator:
Georgevich, V; Pincosy, P & Chase, J
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Investigation of Steven Impact Test Using a Transportation Hook Projectile with Gauged Experiments and 3D Modeling
Description:
The Steven Impact Test and associated modeling offer valuable practical predictions for evaluating numerous safety scenarios involving low velocity impact of energetic materials by different projectile geometries. One such scenario is the impact of energetic material by a transportation hook during shipping, which offers complexity because of the irregular hook projectile shape. Experiments were performed using gauged Steven Test targets with PBX9404 impacted by a transportation hook projectile…
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Date:
July 2, 2003
Creator:
Vandersall, K S; Murty, S S; Chidester, S K; Forbes, J W; Garcia, F; Greenwood, D W et al.
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Dynamics of Collisions Revealed by Classical Methods
Description:
Single ionization of helium by impact of 3.6 MeV/u Au{sup 53+} ions is investigated by means of quantum and classical methods. Calculation of fully-differential cross sections are compared to recently published data for ionization of low-energy electrons as a function of the momentum transferred by the projectile to the target system. The results show that inclusion of the resolution and uncertainties present in the experiment has a major influence on both the shape and magnitude of the calcula…
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Date:
October 1, 2004
Creator:
Olson, R E; Fiol, J; Perez, J & Beiersdorfer, P
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Threshold Studies of Heated HMX-Based Energetic Material Targets Using the Steven Impact Test
Description:
Impact tests performed at low velocity on heated energetic material samples are of interest when considering the situation of energetic materials involved in a fire. To determine heated reaction thresholds, Steven Test targets containing PBX 9404 or LX-04 samples heated to the range of 150-170 C were impacted at velocities up to 150 m/s by two different projectile head geometries. Comparing these measured thresholds to ambient temperature thresholds revealed that the heated LX-04 thresholds wer…
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Date:
July 1, 2003
Creator:
Switzer, Lori L.; Vandersall, Kevin S.; Chidester, Steven K.; Greenwood, Daniel W. & Tarver, Craig M.
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Finite element models to predict the structural response of 120-mm sabot/rods during launch
Description:
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…
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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.)
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Long-rod projectiles against oblique targets: analysis and design recommendations
Description:
Computer calculations provide an understanding of impact phenomena associated with long rod penetrators striking targets at oblique angles. The rod and target material behaviors are described by elastic-plastic work-hardening constitutive models. Ductile fracture is simulated by setting all tensile and shear stresses to zero when the calculated plastic deformation reaches a critical value. The important penetration material properties to defeat a given target are identified. There is no single …
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Date:
April 16, 1976
Creator:
Norris, D. M.; McMaster, W. H. & Wilkins, M. L.
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Report
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Recent Progress in the Scale-Up of TATB by the VNS Method
Description:
The explosive TATB is used in the Department of Energy's main charges and boosters, where its extraordinary insensitivity to impact, spark and heat make it highly advantageous. This IHE is also used in booster applications in naval weapons, and is being tested as a main charge fill for hard target penetrator projectiles. (Slides 2-5) In order to meet demand, a continuing supply of TATB will be required. However, no production base exists in the U.S. for TATB production, and processes once used …
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Date:
August 23, 2001
Creator:
Schmidt, R. D.; Mitchell, A. R.; Lee, G. S.; Quinlin, W. T.; Cates, M. & Coburn, M. D.
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NADS: A Web Applet for Manipulation and Graphical Viewing of Nuclear Data
Description:
We have developed a program called NADS (Nuclear and Atomic Data System) which provides a web-based, user-friendly interface for viewing nuclear data. NADS uses a client/server model. The client is a Java applet that runs in a web browser. The server is a Python code that delivers pointwise data to the applet per user request and then plots the data. The data is also stored in tables for viewing and modifying. NADS can display 2-D, 3-D and 4-D (time sliced) data in a powerful, user-friendly env…
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Date:
November 30, 2004
Creator:
McKinley, M S; Beck, B R & McNabb, D P
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Direct Energy Exchange Enhancement in Distributed Injection Light Gas Launchers
Description:
It is not widely acknowledged or appreciated that conventional, two-stage light-gas launchers do not efficiently apply their high breech pressures to the design intent: accelerating the projectile. Our objective in this project was to carry out the analysis, design, construction, and testing of a new class of launchers that will address this limitation. Our particular application is to expand the pressure range of the conventional, two-stage gas launcher to overlap and validate the pressure reg…
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Date:
April 6, 2000
Creator:
Alger, T W; Finucane, R G; Hall, J P; Penetrante, B M & Uphaus, T M
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LLNL Modeling Calculations in Support of the NMD EOS Program: FY01 3Q Report (U)
Description:
A program to examine equation-of-state (EOS) issues of interest to the National Missile Defense (NMD) program has been underway for a couple of years. There are current plans to conduct experiments at Sandia National Laboratory in Albuquerque. The initial experiments will be two-dimensional: a thin flyer will normally impact a target at two nominal velocities 6 km/s and 11 km/s. A witness plate is placed parallel to the target, separated from it by a 75 mm gap. Several channels of VISAR measure…
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Date:
July 1, 2001
Creator:
Gerassimenko, M.
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Modeling of measured target pressure profiles in three hypervelocity impact experiments
Description:
A 24 g aluminum sphere was shot at a sparse array of cylinders with nominal initial projectile velocity of 4 and 5 km/s. Pressure profiles were measured with cased carbon resistor gages at two locations in a projectile impacted water filled cylinder and two of its neighbors on three shots. The pressure maxima were in the 1-13 kbars range. The experiments are modeled with the ALE3D code and several techniques are used to concentrate zoning at places of interest. There is excellent agreement betw…
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Date:
October 11, 2000
Creator:
Gerassimenko, Michel
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