The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite Materials

Report No. ARL-CR-550
Authors: Alper Tasdemirci, Ian W. Hall, Bazle A. Gama, and Mustafa Guden
Date/Pages: September 2004; 44 pages
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 these 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 numerical 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.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2004