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Title: Porting Inition and Failure to Linked Cheetah

Abstract

Linked CHEETAH is a thermo-chemical code coupled to a 2-D hydrocode. Initially, a quadratic-pressure dependent kinetic rate was used, which worked well in modeling prompt detonation of explosives of large size, but does not work on other aspects of explosive behavior. The variable-pressure Tarantula reactive flow rate model was developed with JWL++ in order to also describe failure and initiation, and we have moved this model into Linked CHEETAH. The model works by turning on only above a pressure threshold, where a slow turn-on creates initiation. At a higher pressure, the rate suddenly leaps to a large value over a small pressure range. A slowly failing cylinder will see a rapidly declining rate, which pushes it quickly into failure. At a high pressure, the detonation rate is constant. A sequential validation procedure is used, which includes metal-confined cylinders, rate-sticks, corner-turning, initiation and threshold, gap tests and air gaps. The size (diameter) effect is central to the calibration.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
921163
Report Number(s):
UCRL-CONF-232938
TRN: US200804%%1484
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 2007 APS SCCM Hawai'i, Mauna Lani Resort, HI, United States, Jun 23 - Jun 29, 2007
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AIR; CALIBRATION; EXPLOSIONS; EXPLOSIVES; FLOW RATE; KINETICS; PRESSURE RANGE; SIMULATION; VALIDATION

Citation Formats

Vitello, P, and Souers, P C. Porting Inition and Failure to Linked Cheetah. United States: N. p., 2007. Web.
Vitello, P, & Souers, P C. Porting Inition and Failure to Linked Cheetah. United States.
Vitello, P, and Souers, P C. Wed . "Porting Inition and Failure to Linked Cheetah". United States. https://www.osti.gov/servlets/purl/921163.
@article{osti_921163,
title = {Porting Inition and Failure to Linked Cheetah},
author = {Vitello, P and Souers, P C},
abstractNote = {Linked CHEETAH is a thermo-chemical code coupled to a 2-D hydrocode. Initially, a quadratic-pressure dependent kinetic rate was used, which worked well in modeling prompt detonation of explosives of large size, but does not work on other aspects of explosive behavior. The variable-pressure Tarantula reactive flow rate model was developed with JWL++ in order to also describe failure and initiation, and we have moved this model into Linked CHEETAH. The model works by turning on only above a pressure threshold, where a slow turn-on creates initiation. At a higher pressure, the rate suddenly leaps to a large value over a small pressure range. A slowly failing cylinder will see a rapidly declining rate, which pushes it quickly into failure. At a high pressure, the detonation rate is constant. A sequential validation procedure is used, which includes metal-confined cylinders, rate-sticks, corner-turning, initiation and threshold, gap tests and air gaps. The size (diameter) effect is central to the calibration.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {7}
}

Conference:
Other availability
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