Stress Pulse Tail Experiments with Electron Beams and Underground Test
Abstract
The Split-Hopkinson bar technique has been used to study the late time stress amplitude from blow-off of quartz phenolic, tape wrapped carbon phenolic, and phenolic resin by pulsed electron beams and underground test irradiation. In all cases, the stress decreased to less than 10 bars within 10 to 20 microseconds after the main stress peak. There is no late time stress of sufficient amplitude to significantly affect material or structural response. This result indicates that the prompt impulse, not total impulse, should be used for calculations, correlations and above ground simulations. The thin piezoelectric crystal was also used in a new gauge design (CMX gauge) for long time stress recording in one-dimensional strain geometry with high frequency response and very high stress sensitivity. The one-dimensional read time is limited only by the size of the irradiated area. The gauge was tested with simultaneous laser velocity interferometer measurements. The limited data obtained with the CMX gauge indicated that the stress history is recorded in detail permitting integration to determine the impulse generation as a function of time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 30, 1979
- Accession Number
- ADA080550
Entities
People
- David A. Rice
- Donald V. Keller