Abstract
Deformation induced heating of reactive solids is a physically complex process. As such, the effects of meso-structure, component thermomechanical properties, component mass fractions, and porosity on their impact response is not well-understood. In this study, an explicit, 2-D, Lagrangian finite and discrete element technique is used to examine thermomechanical fields in metal-explosive (aluminum-HMX) particle mix- tures due to piston supported uniaxial deformation waves. The meso-scale description uses a plane strain, thermoelastic-viscoplastic and friction constitutive theory to describe the motion and deformation of individual particles, and an energy consistent, penalty based method to describe inter-particle contact. The deformation response of material having an initial solid volume fraction of φ 0 s = 0.835 is characterized for different metal mass fractions and wave strengths. Predictions indicate that the response can be classified into strength dominated and pressure dominated regions depending on wave strength. Average thermomechanical fields that define the macro-scale wave structure are found to differ both qualitatively and quantitatively between the two regions.
Highlights
Reactive solids often consist of mixtures of high-explosive, metal, and oxidizer particles embedded within a polymeric binder
It has been shown that inclusion of metal in explosive mixtures can affect their impact sensitivity, detonation, and post-detonation behavior, though it remains fundamentally unclear how meso-structure, component thermomechanical properties, and metal mass fraction, affect the impact sensitivity of the mixture
The first objective is important for identifying physical mechanisms responsible for ignition, whereas the second objective is important for developing macro-scale, multiphase constitutive theories to accurately assess the performance of reactive solids in practice [1, 2]
Summary
Reactive solids often consist of mixtures of high-explosive, metal, and oxidizer particles (size ≈ 10–200 μm) embedded within a polymeric binder. Multiphase theories are routinely posed in terms of phase interaction terms that implicitly account for particle-scale phenomena that are difficult to experimentally resolve. In the vicinity of sharp particle corners that are impossible to numerically resolve This simplified initial configuration still enables leading-order effects of viscoplastic deformation and interparticle friction to be assessed.
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