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1	CRYSTAL PLASTICITY OF PENTAERYTHRITOL TETRANITRATE (PETN) Jennifer Oai Lai (17677422) 24 April 2024 (has links) <p dir="ltr">We investigate the crystal plasticity and shock response of single crystal and polycrystalline pentaerythritol tetranitrate (PETN) using mesoscale finite element simulations. The model includes the Mie-Grüneisen Equation of State and a single crystal plasticity model. Simulations with single crystals with different orientations are tested using our plasticity model under shock compression to explore shear stress and slip. Parameters regarding the Mie-Grüneisen Equation of State are also verified in various orientations from 0.50 to 1.75 km/s. A polycrystalline PETN sample with varying grain sizes and orientations are subjected to shock loading with impact velocities ranging from 0.25 to 0.75 km/s. We study how differences in shock orientation affect slip and stress in PETN at different shock strengths.</p> Structure and dynamics of materials Aerospace materials Aerospace structures Solid mechanics energetic materials PETN crystal plasticity modeling crystal orientation shock single crystal polycrystal material finite elements simulations Continuum & Computational Mechanics slip systems equation of state (EoS)