- Author
-
Kooker, D. E.
|
Anderson, R. D.
- Title
- Modeling of Hivelite Solid Propellant.
- Coporate
- Army Ballistic Research Lab., Aberdeen Proving Ground, MD
- Report
-
BRL-TR-2649,
April 1985,
71 p.
- Keywords
-
combustion models
|
mechanical properties
|
solid propellants
|
numerical analysis
- Abstract
- A modeling study has attempted to simulate the closed-bomb combustion behavior of Hivelite propellants (trade-name of Teledyne McCormick Selph), some of which have apparent linear burning rates up to 500 m/s. Recent high-speed photography by White (BRL) indicates a unique combustion mechanism involving propagation of an in-depth reaction followed by mechanical disintegration of a porous char. An earlier proposal for the combustion mechanism captures much of the basic concept, but is missing some important elements. The model based on the original mechanism shows that initial fragment size is the controlling influence. A parallel effort is development of a constitutive model for unburned Hivelite propellant; this model provides reasonable correlation of new mechanical property data measured by Costantino (LLNL). The constitutive model finds that Hivelite propellant is a compacted granular material where the compressible but rate-independent solid particles are involved in a rate-dependent pore collapse.