Determine mechanical properties of particulate composite using ultrasound spectroscopy.
It is known that microscopic spherulite growth plays an important role in macroscopical properties such as elastic moduli of some semicrystalline polymers. Ultrasonic spectroscopy can be used to quantitatively determine the role of spherulites. As a first approximation, spherulitic polymers are modeled as a material with spherical inclusions in an amorphous matrix. This two-phase composite model is then physically realized by embedding glass micro-spheres in an epoxy. The dynamic mechanical properties of these composites are experimentally determined by measuring their acoustic properties such as phase velocity and attenuation. Acoustic scattering theories are then applied to this model to test their predictive capabilities for the real composite's mechanical properties.
Wu
Junru
J
Department of Physics, University of Vermont, Burlington, VT 05405, USA. jwu@zoo.uvm.edu <jwu@zoo.uvm.edu>
Layman
Christopher
C
Murthy
Sanjeeva
S
Yang
Ruey-Bin
RB