1. Deep-release of Epon 828 Epoxy from the Shock-driven Reaction Product Phase.
- Author
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Lang, John M., Fredenburg, D. Anthony, Coe, Joshua D., and Dattelbaum, Dana M.
- Subjects
- *
EPOXY resins , *LITHIUM fluoride , *EQUATIONS of state , *BIOCHEMICAL substrates , *DOPPLER velocimetry - Abstract
A series of gas-gun experiments was conducted to obtain product isentropes for 70/30 weight percent Epon 828 epoxy resin/Jeffamine T-403 curing agent. Thin epoxy flyers backed by a low-density syntactic foam impacted lithium fluoride (LiF) windows at velocities up to 6.3 km/s, creating stresses in excess of those required for reaction (~25 GPa). Following this, a rarefaction fan from the back of the thin flyer reduced the pressure in the epoxy products. VISAR and PDV were used to measure the velocity of the epoxy/LiF interface. Numerical simulations using several different treatments for the reactant-to-product transformation were conducted and the results compared with measured wave profiles. The best agreement with experiment was obtained using separate tabular equations of state for the reactants and products and an irreversible transformation to products. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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