Characterization of initiation and detonation by Lagrange gage techniques. Final report

Technical Report · Tue Apr 01 04:00:00 EST 1980

OSTI ID:5376876

Cowperthwaite, M; Rosenberg, J T

SRI International performed theoretical studies on the Lagrange gage analysis techniques for determining flow fields and energy release rates in shocked explosives. Lagrange analyses were performed using as input the multiple Lagrange pressure histories recorded in shocked PBX 9404 at Lawrence Livermore Laboratory (LLL). The particle velocity histories calculated in these analyses were compared with those recorded in shocked PBX 9404 at LLL. The agreement between these calculated and measured particle velocity histories demonstrates the consistency of the stress and particle velocity measurements in shocked PBX 9404 and validates the use of both stress and particle velocity gages in the explosive environment. A more realistic model was developed for describing a shocked reacting explosive and calculating the energy release rate from the flow parameters provided by a Lagrange analyses. The model is based on the assumption that the explosive and its reaction products attain mechanical equilibrium but have different temperatures. Equations expressing the first and second laws of thermodynamics for such a reacting explosive mixture were derived and interpreted physically to provide an understanding of the implicit assumptions made in formulating the constitutive relationships for calculating the reaction coordinate or reaction rate in the last step of a Lagrange analysis.

• Research Organization: SRI International, Menlo Park, CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5376876
• Report Number(s): UCRL-15240
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100* -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
CHEMICAL EXPLOSIVES
DATA
DETONATION WAVES
DETONATIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
EXPERIMENTAL DATA
EXPLOSIVES
INFORMATION
LAGRANGE EQUATIONS
NUMERICAL DATA
PARTICLES
PRESSURE DEPENDENCE
SHOCK WAVES
THEORETICAL DATA
VELOCITY