Local acoustoelasticity in poly(methyl methacrylate) by Brillouin scattering

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Abstract
The Brillouin scattering technique was used to study the local mechanical deformation of poly(methyl methacrylate) (PMMA). The extent of local stress concentration could be determined by measuring longitudinal hypersonic velocities in the close vicinity of a circular hole and a sharp single-edge-notch (SEN) in panel PMMA specimens under uniaxial tensile stress. Craze formation in PMMA is also briefly discussed in association with such a local deformation. Present studies demonstrate that the Brillouin scattering technique is a new and effective probe for such an investigation in transparent materials.