Nondestructive Testing of Graphite for the REVMAT Program,
Abstract
Radiographic technique and sensitivity curves for graphite thicknesses from 0.200 inches to 3.0 inches have been established. The resolution limits for the radiography of graphite, which had not previously been established, were measured and found to be an 0.007 inches diameter spherical void for 0.2 inches thickness increasing to an 0.020 inches diemater void for 0.3 inches thickness. Microradiography has been shown to be useful for the measurements of voids and inclusions in graphite. Ultrasonic velocity measurements have indicated a 15% lower velocity in the direction of compression than in the direction normal to this axis. This implies an equally lower value of the bulk modulus. Radiation gauging of an 0.600 inched sample of ATJ-S indicated that 1% change in thickness could be detected at a 98% confidence level. A description of radiation gauging equipment suitable for gauging graphite thicknesses up to 1.0 inches is included.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 12, 1973
- Accession Number
- AD0913754
Entities
People
- Daniel Polansky
- Edward L. Criscuolo
- Robert A. Youshaw
Organizations
- Naval Ordnance Laboratory