Experimental Determination of Shock Structures in Hetrogeneous Layered Material Systems
Abstract
In the present study, in an attempt to better understand the dynamic response of heterogeneous materials, a combined analytical and experimental study is conducted on elastic-elastic and elastic-viscoelastic bilaminates. The analytical approach makes use of the Laplace transform and Floquet theory for ODE with periodic coefficients. The effects of material impedance mismatch, layer density and material inelasticity on shock wave propagation through elastic-elastic and elastic-viscoelastic bilaminates were studied. Besides the study on bilaminates, several series of plate impact experiments were performed on glass fiber-reinforced polymer(GRP). By varying the shock compression stress and GRP specimen thicknesses, the structure of shock waves in GRP were investigated. From the measurements of the free surface particle velocity history, the Equation of State, Hugoniot Elastic Limit and Hugoniot curve of GRP were determined. The spall strength of GRP was also studied by conducting a series of both normal-impact and combined pressure-shear plate impact experiments. The spall strength was found to decrease dramatically with increasing compression stress and increasing shear strain. Shock-reshock and shock-release experiments were performed to determine the dynamic yield strength of GRP. The calculated dynamic yield strength was found to increase by approximately a factor of 10 within the test range.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 19, 2005
- Accession Number
- ADA447270
Entities
People
- Liren Tsai
- Vikas Prakash
Organizations
- Case Western Reserve University