Modeling of pulverulent ceramic jets with CALE: Final report
The intent of this work is to provide an accurate, predictive description of the formation and evolution of pulverulent (consisting of finely divided grains) ceramic jets. The present phase of this effort is devoted to validation and optimization of the intact and powder ceramic material models by comparison of calculated model performance with experimental data. Physically reasonable parameters were chosen for the model which was optimized by comparison of the calculated results with experimental flash X-ray density data. Optimization parameters included jet tip velocity, jet density distributions, jet radius, and penetration depth. The optimized jets were tested in configurations similar to those of experiment and reproduced the data adequately. Jet formation from intact ceramic liners is a complicated physical process which is not yet completely understood. Models have been developed to describe this process at the level of current understanding. The models account for such processes as fracture of the solid ceramic by the high explosive detonation shock front, loss of yield strength as the resulting pulverized ceramic is decompressed and flows into the jet, dilatation and expansion of the pulverized ceramic as jet formation proceeds, and entrainment of air into the voids between the grains of the pulverized ceramic as the jet stretches and expands. The description of the behavior of ceramics under shock loading consists of four models (equation of state model, dilatancy model, air diffusion model, and strength model) which are incorporated into a special version of LLNL`s CALE, a C-language-based, two-dimensional Arbitrary Lagrangian-Eulerian hydrocode that is portable to Unix systems. Despite the interdependence of the model components, it is possible to determine reasonable values for the model parameters which allow quantitative agreement with the existing experimental data. These are briefly described and compared to the results of CALE simulations.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10115330
- Report Number(s):
- UCRL-ID-114570; ON: DE94005314; TRN: 94:001240
- Resource Relation:
- Other Information: PBD: 31 Dec 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
CERAMICS
SOLIDS FLOW
JETS
PROGRESS REPORT
COMPUTERIZED SIMULATION
C CODES
POWDER METALLURGY
SHOCK WAVES
EQUATIONS OF STATE
DILATANCY
FRACTURE MECHANICS
420400
360202
990200
HEAT TRANSFER AND FLUID FLOW
STRUCTURE AND PHASE STUDIES
MATHEMATICS AND COMPUTERS