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An Adaptive Numerical Methodology for Mesoscale Binder-Crystal Interactions and Damage Propagation in Impact Loaded Energetic Materials

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Technical Report,15 Dec 2016,14 Jun 2017

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The University of Oxford Oxford United Kingdom

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The ability to model the stress concentration, strain localization, crack initiation and propagation at mesoscopic length scales of heterogeneous materials such as polymer bonded explosives is critical to preventing undesirable ignitions. The research conducted in this study addresses the ability to model the strain localization, crack initiation and propagation by using explicit Lagrangian solution of the underlying partial differential equations within domains of interest discretized using finite elements and initially rigid cohesive elements. This approach is superior in its ability to model stress wave propagation excited by rapidly applied loads along model boundaries as it does not suffer from inaccuracies imposed by numerically generated internal impedance boundaries to their propagation. New criteria for detection of the onset of strain localisation, new algorithms for activation of initially rigid cohesive elements, strain softening, crack initiation and crack propagation have been implemented within in-house software DEST Discrete Elements Simulation Tools in order to enable existing and new experimental data to be used to enable further improvements of both the understanding of the underlying physical process as well as thus motivated further improvements of related modelling capabilities. The developed algorithms are presented alongside benchmarks which confirm their effectiveness.

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