Proceedings Paper for the 60th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference at AIAA SciTech 2020 Orlando, Florida, USA 6-10 January 2020 2020

AIAA 2020-2108

Effective Properties of Granular Composites as a Function of Relative Damage Evolution in Constituent Phases

Stefan Povolny, Gary D. Seidel, and Daniel Hammerand
Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0203, USA

High explosives or energetic materials are designed to undergo a chemical reaction in response to a trigger, releasing a large amount of energy quickly. With the potential for inadvertent detonation associated with accidental low velocity impact there is clearly a need to establish safety tests and procedures. Currently, many different safety related tests must be run to characterize its safety and handling characteristics, again with observations typically taking place at the macroscale. Such tests offer a relative measure of the probability of ignition by accidental stimuli that may result in a violent reaction or even detonation, but are unable to correlate such observations with the mesoscale structural details/processes. As such, there is considerable interest in developing physics-based computational models for energetic materials which can capture mesoscale structural influences on macroscale observable response and be able to predict both safe handling limits as well as to provide insight on energetic design. This work seeks to characterize the mesoscale damage mechanisms present, including interfacial damage modeled using cohesive zones and binder and grain damage using continuum damage mechanics.