Classification of Materials by Shock Properties
Abstract
A new experimental technique was developed for determining load and unloading stress-volume paths directly from gage measurements; theoretical models were formulated for stress relaxation and the Bauschinger effect; Hugoniot information was generated from impact experiments on aluminum alloys, titanium alloys, and a woven quartz-phenolic; and the new experimental technique and Bauschinger calculations were applied to the aluminum alloys. The new experimental technique provides for measurement of complete loading and unloading paths rather than the discrete Hugoniot or release points previously obtained. The technique is applicable to the examination of nonsteady-state, nonisentropic flow, yield point phenomena, strain-hardening, the Bauschinger effect, and strain-rate (or stress-relaxation) effects. The technique is based on the entire stress or particle-velocity records obtained from a series of gages embedded in a specimen. Four stress relaxation models were implemented in the SRI PUFF wave propagation code, and computations were made to obtain representative results. The Bauschinger model implemented in the SRI PUFF code exhibits the smooth unloading adiabat and high rarefaction velocity observed in our experiments on 6061-3A1 titanium served to map Hugoniots from 15 to 750 kbar, indicate Hugoniot elastic limits, and show an alpha to omega phase transformation at 50 kbar. Preliminary experiments on a three-dimensional woven quartz phenolic resulted in Hugoniot data from 10 to 200 kbar and indicated a shock-wave structure that is very different from that observed in homogeneous solids.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1969
- Accession Number
- AD0865505
Entities
People
- D. C. Erlich
- J. T. Rosenberg
- L. Seaman
- R. F. Williams
- R. K. Linde
Organizations
- SRI International