Microstructure Dependant Reactive Flow Model for Heterogeneous Energetic Materials

摘要

A new reactive flow model for heterogeneous energetic materials has been developed based the physical and chemical parameters of the material as much as possible rather than solely relying on empirical constants to determine the reaction rates behind the shock wave Firstly this report presents an extended viscoplastic pore collapse (hot spot) model based on previous models presented in the literature. Results from this hot spot model are then used to develop a reactive flow model embedded into the multi-material hydrocode, MULTI, using an Induction-Parameter- Model to describe the thermomechanical processes of pore collapse in a computationally efficient manner. One and two-dimensional hydrocode results are presented for the energetic material HMX undergoing bare and cased projectile impact. The results show- the importance of microstructure in determining the shock ignition and subsequent growth behavior in energetic materials. Thus, a new capability- is described for determining the effects of varying porosity (due to manufacture aging damage, etc) on shock sensitivity and can be used to help evaluate the Insensitive Munitions (IM) qualities of weapon systems.