Dynamic Properties of Poly(methylmethacrylate) (PMMA) (Plexiglas)
GENERAL MOTORS TECHNICAL CENTER WARREN MI MATERIALS AND STRUCTURES LAB
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Uniaxial stress behavior, elastic constants, equation of state, compressive and release wave characteristics, and spall fracture of PMMA are investigated. The material showed viscoelastic response under uniaxial stress conditions, and was strain rate sensitive at 20 and 82 C. Longitudinal and shear wave velocities at 20 C were 2.746 and 1.392 mm microsec, and temperature dependence was also measured. The shock wave equation of state was determined up to 20 Kbar and showed a complex form in the stress-particle velocity plane that is indicative of non- linear shock-velocity-particle velocity behavior. Complete wave profiles were obtained showing compressive wave and release wave development. Spall fracture velocity showed a slight pulse-width dependence and the fracture surface showed a granular-type appearance with extensive crazing.