Some Mechanical Properties of Graphite at Elevated Temperatures
- North American Aviation, Inc., Downey, CA (United States)
The short-time tensile breaking strength of various grades of graphite was measured as a function of temperature from room temperature to the sublimation point. A characteristic, common to all the strength versus temperature curves, is that the strength approximately doubles in going from roan temperature to about 2500° C and then decreases rapidly to zero near the sublimation point. The dependence of strength on room temperature, bulk density and the density distribution within an original block is given for grade EBP graphite. The creep characteristics of grade EGA graphite under tensile stress at elevated temperatures were investigated. The testing temperature ranged from 2200° C to 2900° C while the applied stress varied from 500 psi to 5,500 psi. The range of "steady" creep rates measured extended from 3 x 10-8 to 2 x 10-4 inches per inch per second. The activation energy and change in entropy defined by rate theory were calculated for the above conditions. Low frequency dynamic measurements of the Young's modulus of grade EGA graphite made at temperatures from 1000° C to 2000° C showed an increase of the modulus with temperature.
- Research Organization:
- North American Aviation, Inc., Downey, CA (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AT(11-1)-GEN-8
- NSA Number:
- NSA-05-000393
- OSTI ID:
- 4391492
- Report Number(s):
- NAA-SR--79
- Country of Publication:
- United States
- Language:
- English
Similar Records
MEASUREMENTS OF MECHANICAL PROPERTIES OF PURE AND URANIUM-LOADED GRAPHITES AT ELEVATED TEMPERATURES. Final Report for June 27, 1957 through December 15, 1958
Characterization of carbide--graphite composite material. First progress report