Random initiation and reaction propagation in energetic materials
Abstract
Main challenges in modeling and simulations of the physical processes leading to reaction initiation in granular energetic materials include the lack of both a general model for heterogeneous particulate media under compaction and a reliable multiscale discrete-to-continuum framework for describing diffusion-advection-reaction processes in complex materials with defects. Most conventional models of visco-plastic deformations of granular media under shear and compression ignore the effects of spatial heterogeneity, which often violate the foundational assumptions ofcontinuum descriptions. This heterogeneity plays a major role in stress and heat localization events responsible for initiating reactions in energetic materials. We posit that multiscale effects leading to localization events cannot be modeled deterministically due to (i) uncertainty in the specific microscopic structure of the material at initial conditions and (ii) the chaotic/unpredictable nature of particulate systems in dynamic regimes. Despite the large amount of experimental studies of granular media under diverse conditions, multiscale interactions are intrinsically hard to measure. Therefore, computer simulations of stochastic models that account for uncertainty and random heterogeneity are necessary to predict and compare macroscopic artifacts that arise as a result of microscopic fluctuations.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501710417
Entities
People
- Daniel M. Tartakovsky
Organizations
- Air Force Office of Scientific Research
- Stanford University
- United States Air Force