DURIP/ARO Program on Time-Resolved Pressure-Measurement Instrumentation for High-Strain Rate Materials Synthesis.
Abstract
In this program, advanced diagnostic instrumentation was developed for time-resolved pressure measurements for experimentation involving materials synthesis by shock-compression of powders and their mixtures. The instrumentation has been developed with the objective of (a) allowing to determine the shocked state of material in real time with nanosecond resolution, to quantitatively correlate the loading histories with post-shock characteristics of materials produced using recovery experiments; and (b) monitoring the shock-initiated transformation or chemical reaction processes in real time by observing the response of in-situ probes to obtain a detailed understanding of the mechanisms and kinetics of processes occurring during the shock-compression state. The instrumentation developed is based on tune-resolved stress-wave measurements using the piezoelectric polyvinylidene-flouride (PVDF) gages, and includes: two Tektronix 784A digital oscilloscopes (1 GHz bandwidth, 1 GS/s rate, and 4 channels) and the associated hardware including high-frequency low-loss coaxial transmission cables, HP pulse and delay generator, HP electronic counters, and an independent circuitry several sets of gages. The instrumentation will be extensively useful for enhancing the quality of on-going research supported by ARO under Grant No. DAAH04-94-G-0192, entitled 'An Investigation of the Mechanisms, Kinetics, and Energetics of Shock-induced Chemical Reactions in the Ti-Al/Si/B System,' and the AASERT program on 'Combustion Synthesis of High-density Powder Mixture Compacts under Conditions of Dynamic Stress and Electric Field.'
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1996
- Accession Number
- ADA313525
Entities
People
- K. Vandersall
- N. N. Thadhani
- Rebecca L. Russell
Organizations
- Georgia Tech