|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Method and Experimental Approaches for Model Development and Validation, Uncertainty Quantification, and Stochastic Predictions
||Dynamic Failure of High Energy Materials: Uncertainty Quantification and Stochastic Predictions
||Marisol Koslowski, Nicolo Grilli, Camilo Duarte Cordon, Akshay Dandekar
|On-Site Speaker (Planned)
Polymer bonded explosives consist of high energy particles in a polymeric binder. When they are subjected to heat, impact, or other stimulus, they undergo a rapid chemical change. The sensitivity to initiation depends on the amount of energy available in the system and on the rate at which it is released and localized in regions known as “hot spots”. However, this process is not repeatable. For example, in the same sample some particles initiate while others do not.
Finite element simulations that explicitly describe particles, are performed to study the sensitivity of the microstructure to initiation and to identify the mechanisms of hot spot formation under a range of mechanical stimulus. The finite element model incorporates plasticity, fracture and heat transport. Different microstructures with initial defects are analyzed. Our work suggests that heat generated by friction at preexisting microcracks and at particle binder interfaces are key hot-spot mechanism formation.
||Planned: Supplemental Proceedings volume