EFFECTS OF TEMPERATURE AND STRAIN RATE ON TRANSVERSE TENSILE PROPERTIES OF H4LM GRAPHITE TESTED IN HELIUM AND IN VACUUM
Curves are presented showing the ultimate tensile strength of molded H4LM graphite in the transverse orientation (with the grain) as a function of temperature, for tests made in vacuum and in static helium at nominal engineering strain rates of 0.005, 0.5, and 2.0/min. Temperature ranges considered are ambient to 2000 deg C for tests in vacuum, and ambient to 2500 deg C for those in helium. A general increase of strength occurs as temperature rises; however, the magnitude of the strength increase is reduced by testing at the higher strain rates. Fracturing of graphite is discussed, and it was concluded that the results can best be explained in terms of a selective mass-transport mechanism that heals, or at least blunts, dormant cracks formed early in the fracture history. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- DOE Contract Number:
- W-7405-ENG-36
- NSA Number:
- NSA-18-018349
- OSTI ID:
- 4033976
- Report Number(s):
- LADC-5779
- Country of Publication:
- United States
- Language:
- English
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