Large Amplitude Compression and Shear Wave Propagation in Impact-Loaded PMMA

摘要

The goal of this research was to develop an improved understanding of the high strain rate material response of polymers by studying the propagation of large-amplitude, one-dimensional compression and shear waves in impact-loaded polymethyl methacrylate (PMMA). Experimental techniques were designed and developed to permit measurement of large-amplitude shear waves. Measurements were made of the shear particle velocity at the impact surface and in the sample interior. The measurement of shear wave velocities permitted the first determination of the shear and bulk modulus in the shocked state. The shear wave profiles measured at several gage locations in the sample were integrated (using a Lagrangian analysis for compression and shear waves) to provide shear stress-strain response in the shocked state. These results are the first of their kind and provide an important constraint on the shear (or deviator) response of the material. (Author)