Accession Number:

ADA394713

Title:

Modeling and Analysis of Reactive Compaction for Granular Energetic Solids

Descriptive Note:

Final rept May-Aug 2001

Corporate Author:

LOUISIANA STATE UNIV BATON ROUGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2001-09-01

Pagination or Media Count:

26.0

Abstract:

A technique is described for modeling mechanically induced localized heating and ignition at the grain scale meso-scale of granular reactive solids that maintains proper consistency with the experimentally characterized bulk macro-scale material behavior. The technique is illustrated for the dynamic compaction, localized heating, and ignition of granular HMX due to mild impact of a constant speed piston 86 ms. Guided by basic principles of contact mechanics, bulk dissipated mechanical energy is thermalized at localization sites hot-spots within the material meso-structure which are centered at intergranular contact points surfaces. The evolution of bulk quantities is tracked at the macro-scale and the evolution of hot-spot temperature, mass fraction, and reaction progress are tracked at the meso-scale. Model predictions indicate that the onset of sustained combustion occurs for a piston speed that agrees well with confined Defiagration-to-Detonation Transition DDT experiments. This result suggests that the coupling technique may provide a rational framework for the development of improved energy localization, and ignition models for heterogeneous reactive solids. Results of a parametric sensitivity analysis show that the model is reasonably insensitive to variation in key energy localization parameters.

Subject Categories:

  • Miscellaneous Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE