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SHOCK INITIATION EXPERIMENTS ON PBX 9501 EXPLOSIVE AT PRESSURES BELOW 3 GPa WITH ASSOCIATED IGNITION AND GROWTH MODELING

Description: Shock initiation experiments on the explosive PBX 9501 (95% HMX, 2.5% estane, and 2.5% nitroplasticizer by weight) were performed at pressures below 3 GPa to obtain in-situ pressure gauge data, run-distance-to-detonation thresholds, and Ignition and Growth modeling parameters. Propellant driven gas guns (101 mm and 155 mm) were utilized to initiate the PBX 9501 explosive with manganin piezoresistive pressure gauge packages placed between sample slices. The run-distance-to-detonation points on t… more
Date: June 13, 2007
Creator: Chidester, S K; Thompson, D G; Vandersall, K S; Idar, D J; Tarver, C M; Garcia, F et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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DYNAMIC LOADING OF TEFLON AT 200?C

Description: Dynamic loading experiments were performed on inert Teflon (Polytetrafluoroethylene) samples, initially heated to the temperature of 200 C, to test its behavior under these conditions for its use in other heated experiments. Tests were performed in the 100 mm diameter bore propellant driven gas gun with piezo-resistive manganin pressure gauges imbedded into the samples to measure loading pressures. Experimental data provided new information on the shock velocity - particle velocity relationship… more
Date: June 13, 2007
Creator: Urtiew, P A; Forbes, J W; Tarver, C M; Vandersall, K S & Garcia, F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Initiation of Heated PBX-9501 Explosive When Exposed to Dynamic Loading

Description: Shock initiation experiments on the heated PBX9501 explosive (95% HMX, 2.5% estane, and 2.5% nitro-plasticizer by weight) were performed at temperatures 150 C and 180 C to obtain in-situ pressure gauge data. A 101 mm diameter propellant driven gas gun was utilized to initiate the PBX9501 explosive and manganin piezo-resistive pressure gauge packages were placed between sample slices to measure time resolved local pressure histories. The run-distance-to-detonation points on the Pop-plot for thes… more
Date: August 16, 2005
Creator: Urtiew, P A; Vandersall, K S; Tarver, C M & Garcia, F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Threshold Studies on TNT, Composition B, and C-4 Explosives Using the Steven Impact Test

Description: Steven Impact Tests were performed at low velocity on the explosives TNT, Comp B, and C-4 in attempts to obtain a threshold for reaction. A 76 mm helium driven gas gun was used to accelerate the Steven Test projectiles up to approximately 200 m/s in attempts to react (ignite) the explosive samples. Blast overpressure gauges, acoustic microphones, standard video and high-speed photography were used to characterize the level of any high explosive reaction violence. No bulk reactions were observed… more
Date: September 26, 2005
Creator: Vandersall, K S; Switzer, L L & Garcia, F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SHOCK INITIATION EXPERIMENTS ON THE LLM-105 EXPLOSIVE RX-55-AA AT 25?C AND 150?C WITH IGNITION AND GROWTH MODELING

Description: Shock initiation experiments on the LLM-105 based explosive RX-55-AA (95% LLM-105, 5% Viton by weight) were performed at 25 C and 150 C to obtain in-situ pressure gauge data, run-distance-to-detonation thresholds, and Ignition and Growth modeling parameters. A 101 mm diameter propellant driven gas gun was utilized to initiate the explosive sample with manganin piezoresistive pressure gauge packages placed between sample slices. The run-distance-to-detonation points on the Pop-plot for these exp… more
Date: June 15, 2007
Creator: Garcia, F; Vandersall, K S; Tarver, C M & Urtiew, P A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Isentropic Compression Experiments Performed By LLNL On Energetic Material Samples Using The Z Accelerator

Description: Several experiments have been conducted by LLNL researchers using isentropic compression experiments (ICE) on energetic materials as samples from Fiscal Year 2001 (FY01) to Fiscal Year 2005 (FY05). Over this span of time, advancements of the experimental techniques and modeling of the results have evolved to produce improved results. This report documents the experiments that have been performed, provides details of the results generated, and modeling and analysis advances to fully understand t… more
Date: October 25, 2007
Creator: Vandersall, K S; Reisman, D B; Forbes, J W; Hare, D E; Garcia, F; Uphaus, T M et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pressure Measurements in a PBX 9501 Gauged Acceptor When Impacted by a Steel Plate that is Accelerated by a Thermally Cooked Off PBX 9501 Charge

Description: Measuring the violence of a thermal explosion of a cased explosive is important for evaluating safety issues of explosive devices in fires. A sympathetic initiation scenario was studied here where a 9.0 cm diameter by 2.5 cm thick disc of PBX 9501 donor charge encased in a 304 stainless steel assembly was heated on top and bottom flat surfaces until it thermally exploded. The initial heating rate at the metal/explosive interface was 5 C per minute until it reaches 170 C; then this temperature i… more
Date: March 11, 2002
Creator: Forbes, J W; Garcia, F; Urtiew, P A; Vandersall, K S; Greenwood, D W & Tarver, C M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Thermal Cook-off of an HMX Based Explosive: Pressure Gauge Experiments and Modeling

Description: Safety issues related to thermal cook-off are important for handling and storing explosive devices. Violence of event as a function of confinement is important for prediction of collateral events. There are major issues, which require an understanding of the following events: (1) transit to detonation of a pressure wave from a cook-off event, (2) sensitivity of HMX based explosives changes with thermally induced phase transitions and (3) the potential danger of neighboring explosive devices bei… more
Date: April 2, 2002
Creator: Urtiew, P A; Forbes, J W; Tarver, C M; Garcia, F; Greenwood, D W & Vandersall, K S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mesoscale Modeling of LX-17 Under Isentropic Compression

Description: Mesoscale simulations of LX-17 incorporating different equilibrium mixture models were used to investigate the unreacted equation-of-state (UEOS) of TATB. Candidate TATB UEOS were calculated using the equilibrium mixture models and benchmarked with mesoscale simulations of isentropic compression experiments (ICE). X-ray computed tomography (XRCT) data provided the basis for initializing the simulations with realistic microstructural details. Three equilibrium mixture models were used in this st… more
Date: March 6, 2010
Creator: Springer, H K; Willey, T M; Friedman, G; Fried, L E; Vandersall, K S & Baer, M R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Summary of Shock Initiation Data for TATB-based Explosives

Description: This short summary of previously published data was compiled to provide the actual in-situ gauge data to allow modeling of these experiments. Although the purpose here is to fulfill a deliverable for a JOWOG 9 Focused Exchange (09-006), it is just as applicable to other exchanges as well. The TATB materials described here are Ultra Fine (UF) TATB and LX-17 (92.5% TATB and 7.5% Kel-F by weight), with the details of the experiments provided in the prior publications. The data is provided in the a… more
Date: April 3, 2010
Creator: Vandersall, K S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SHOCK INITIATION OF COMPOSITION B AND C-4 EXPLOSIVES; EXPERIMENTS AND MODELING

Description: Shock initiation experiments on the explosives Composition B and C-4 were performed to obtain in-situ pressure gauge data for the purpose of providing the Ignition and Growth reactive flow model with proper modeling parameters. A 100 mm diameter propellant driven gas gun was utilized to initiate the explosive charges containing manganin piezoresistive pressure gauge packages embedded in the explosive sample. Experimental data provided new information on the shock velocity--particle velocity rel… more
Date: August 18, 2006
Creator: Urtiew, P A; Vandersall, K S; Tarver, C M; Garcia, F & Forbes, J W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SHOCK INITIATION EXPERIMENTS ON THE HMX BASED EXPLOSIVE LX-10 WITH ASSOCIATED IGNITION AND GROWTH MODELING

Description: Shock initiation experiments on the HMX based explosives LX-10 (95% HMX, 5% Viton by weight) and LX-07 (90% HMX, 10% Viton by weight) were performed to obtain in-situ pressure gauge data, run-distance-to-detonation thresholds, and Ignition and Growth modeling parameters. A 101 mm diameter propellant driven gas gun was utilized to initiate the explosive samples with manganin piezoresistive pressure gauge packages placed between sample slices. The run-distance-to-detonation points on the Pop-plot… more
Date: June 15, 2007
Creator: Vandersall, K S; Tarver, C M; Garcia, F; Urtiew, P A & Chidester, S K
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

THERMAL COOK-OFF EXPERIMENTS OF THE HMX BASED HIGH EXPLOSIVE LX-04 TO CHARACTERIZE VIOLENCE WITH VARYING CONFINEMENT

Description: Thermal cook-off experiments were carried out using LX-04 explosive (85% HMX and 15% Viton by weight) with different levels of confinement to characterize the effect of confinement on the reaction violence. These experiments involved heating a porous LX-04 sample in a stainless steel container with varying container end plate thickness and assembly bolt diameter to control overall confinement. As expected, detonation did not occur and reducing the overall confinement lowered the reaction violen… more
Date: July 25, 2005
Creator: Garcia, F; Vandersall, K S; Forbes, J W; Tarver, C M & Greenwood, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SHOCK INITIATION EXPERIMENTS AND MODELING OF COMPOSITION B AND C-4

Description: Shock initiation experiments on the explosives Composition B and C-4 were performed to obtain in-situ pressure gauge data for the purpose of determining the Ignition and Growth reactive flow model with proper modeling parameters. A 101 mm diameter propellant driven gas gun was utilized to initiate the explosive charges containing manganin piezoresistive pressure gauge packages embedded in the explosive sample. Experimental data provided new information on the shock velocity versus particle velo… more
Date: June 13, 2006
Creator: Urtiew, P A; Vandersall, K S; Tarver, C M; Garcia, F & Forbes, J W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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LX-04 VIOLENCE MEASUREMENTS- STEVEN TESTS IMPACTED BY PROJECTILES SHOT FROM A HOWITZER GUN

Description: Characterization of the reaction violence of LX-04 explosive (85% HMX and 15% Viton A by weight) was obtained from Steven Impact Tests performed above the reaction initiation threshold. A 155 mm Howitzer propellant driven gas gun was used to accelerate the Steven Test projectiles in the range of approximately 170-300 m/s to react (ignite) the LX-04 explosive. Blast overpressure gauges, acoustic microphones, and high-speed photography characterized the level of high explosive reaction violence. … more
Date: July 18, 2005
Creator: Chidester, S K; Vandersall, K S; Switzer, L L & Tarver, C M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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LOW AMPLITUDE SINGLE AND MULTIPLE SHOCK INITIATION EXPERIMENTS AND MODELING OF LX-04

Description: Shock initiation experiments were performed on the plastic bonded explosive (PBX) LX-04 (85% HMX, 15% Viton binder) using single and multiple low amplitude shocks to obtain pressure history data for use in Ignition and Growth reactive flow modeling parameterization. A 100 mm diameter propellant driven gas gun was utilized to initiate the LX-04 explosive charges containing manganin piezoresistive pressure gauge packages placed between explosive discs. In the single shock experiments, the run dis… more
Date: June 27, 2006
Creator: Vandersall, K S; Tarver, C M; Garcia, F; Chidester, S; Urtiew, P A & Forbes, J W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

THRESHOLD STUDIES ON TNT, COMPOSITION B, C-4, AND ANFO EXPLOSIVES USING THE STEVEN IMPACT TEST

Description: Steven Impact Tests were performed at low velocity on the explosives TNT (trinitrotolulene), Composition B (63% RDX, 36% TNT, and 1% wax by weight), C-4 (91% RDX, 5.3% Di (2-ethylhexyl) sebacate, 2.1% Polyisobutylene, and 1.6% motor oil by weight) and ANFO (94% ammonium Nitrate with 6% Fuel Oil) in attempts to obtain a threshold for reaction. A 76 mm helium driven gas gun was used to accelerate the Steven Test projectiles up to approximately 200 m/s in attempts to react (ignite) the explosive s… more
Date: June 20, 2006
Creator: Vandersall, K S; Switzer, L L & Garcia, F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Dynamic Characterization of Mock Explosive Material Using Reverse Taylor Impact Experiments

Description: The motivation for the current study is to evaluate the dynamic loading response of an inert mock explosive material used to replicate the physical and mechanical properties of LX-17-1 and PBX 9502 insensitive high explosives. The evaluation of dynamic material parameters is needed for predicting the deformation behavior including the onset of failure and intensity of fragmentation resulting from high velocity impact events. These parameters are necessary for developing and validating physicall… more
Date: March 25, 2010
Creator: Ferranti, L; Gagliardi, F J; Cunningham, B J & Vandersall, K S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Carbon Resistor Pressure Gauge Calibration at Stresses Up to 1 GPa

Description: Calibration of the 470-Ohm carbon resistor gauge is desired in the low stress region up to 1 GPa. A split-Hopkinson pressure bar, drop tower apparatus, gas pressure chamber, and gas gun have been used to perform the calibration experiments. The gauge behavior at elevated temperature was also investigated by heating the resistors to 200 C at atmospheric pressure while observing the resistance change. The motivation for this calibration work arises from the desire to increase the number of data p… more
Date: March 5, 2002
Creator: Vandersall, K S; Niles, A M; Greenwood, D W; Cunningham, B; Garcia, F & Forbes, J W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

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… more
Date: July 2, 2003
Creator: Vandersall, K S; Murty, S S; Chidester, S K; Forbes, J W; Garcia, F; Greenwood, D W et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New 100 mm Gun Assembly Installation at Lawrence Livermore National Laboratory High Explosives Applications Facility

Description: A new 100mm gun assembly was recently installed and tested at Lawrence Livermore National Laboratories located in the High Explosives Applications Facility (HEAF). Thiot Ingenierie performed the design of the replacement barrel, based on improvements to the initial design. This design incorporated barrel and breech sections forged from CLARM series high-strength alloys obtained from Tecphy Corporation and machined by Manufacture de Forage. Part of the improvement of the design was implementing … more
Date: October 28, 2003
Creator: Vandersall, K S; Lee, R A; Chiao, P I; Garcia, F; Travis, J O & Forbes, J W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pressure Wave Measurements from Thermal Cook-off of an HMX Based Explosive

Description: A better understanding of thermal cook-off is important for safe handling and storing explosive devices. A number of safety issues exist about what occurs when a cased explosive thermally cooks off. For example, violence of the events as a function of confinement are important for predictions of collateral damage. This paper demonstrates how adjacent materials can be gauged to measure the resulting pressure wave and how this wave propagates in this adjacent material. The output pulse from the t… more
Date: May 9, 2001
Creator: Forbes, J W; Tarver, C M; Urtiew, P A; Garcia, F; Greenwood, D W & Vandersall, K S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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