24-10-2012, 11:08 AM
The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite Materials
ABSTRACT
Multilayer materials consisting of ceramic and glass/epoxy with a rubber interlayer have been subjected to a high strain
rate compression using a split-Hopkinson Pressure Bar (SHPB). The feasibility of modeling stress wave propagation in
complex multilayer materials has been demonstrated. It has been shown that the effects of lateral confinement of a normally
low-modulus interlayer material can significantly affect the response to wave propagation. Numerical modeling clearly shows
that severe stress inhomogeneities and discontinuities exist, and theses may have serious consequences for the mechanical and
other properties. The one-dimensional stress state usually assumed for conventional SHPB testing is therefore inapplicable,
and both numberical and experimental results have to be coupled for a complete understanding of the wave propagation
characteristics. In this study, both methods were used, and the stress states inside the components were presented.