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Effects of temperature and strain rate on transverse tensile properties of H4LM graphite tested in helium and in vacuum

✍ Scribed by Morton C Smith

Publisher
Elsevier Science
Year
1964
Tongue
English
Weight
716 KB
Volume
1
Category
Article
ISSN
0008-6223

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✦ Synopsis

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 2000Β°C for tests in vacuum, and ambient to 2500Β°C for those in helium.

A general increase in 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 is concluded that these results can best be explained in terms of a selective mass-transport mechanism which heals, or at least blunts, dormant cracks formed _ early in the fracture history.

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