Abstract
The behavior of isotropic pyrolytic carbons irradiated free from stress is compared with that of the same carbons when the irradiation-induced shrinkage is prevented by an unyielding substrate. Failure of the restrained specimens cannot be predicted from the irradiation-induced dimensional changes of the unrestrained specimens, and fracture strengths do not appear to decrease during irradiation in either a restrained or an unrestrained state. However, restraint and the resulting irradiation-induced creep produce an increase in the preferred orientation of the carbon cystallites. This increase in preferred orientation results in increased irradiation-induced dimensional change rates which can explain the discrepancies in the irradiation behavior of the restrained and unrestrained carbons.
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