التفاصيل البيبلوغرافية
| العنوان: |
Compaction of granular HMX: P-α porosity model in CTH hydrocode. |
| المؤلفون: |
Mahon, K. S.1 Kelly.S.Mahon@raytheon.com, Leeb, T. -W.2 attwl@asu.edu |
| المصدر: |
AIP Advances. 2015, Vol. 5 Issue 12, p127121-1-127121-11. 11p. |
| مصطلحات موضوعية: |
*GRUNEISEN equation of state, *POROSITY, *MICROSTRUCTURE |
| مستخلص: |
Compaction waves traveling through porous cyclotetramethylene-tetranitramine (HMX) are computationally modeled using the Eulerian hydrocodeCTHand validated with gas gun experimental data. The method employed use of a newly generated set of P-α parameters for granular HMX in a Mie-Gruneisen equation of state. The P-α model adds a separate parameter to differentiate between the volume changes of a solid material due to compression from the volume change due to compaction, void collapse in a granular material. Computational results are compared via five validation schema for two different initial-porosity experiments. These schema include stress measurements, velocity rise times and arrival times, elastic sound speeds though the material and final compaction densities for a series of two different percent Theoretical Maximum Density (TMD) HMX sets of experimental data. There is a good agreement between the simulations and the experimental gas gun data with the largest source of error being an 11% overestimate of the peak stress which may be due to impedance mismatch on the experimental gauge interface. Determination of these P-α parameters are important as they enable modeling of porosity and are a vital first step in modeling of precursory hotspots, caused by hydrodynamic collapse of void regions or grain interactions, prior to deflagration to detonation transition of granular explosives. [ABSTRACT FROM AUTHOR] |
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