超電導マグネット含浸材 (エポキシ樹脂) に対する照射効果の一考察
1977 年 12 巻 2 号 p. 65-69
詳細
1977 年 12 巻 2 号 p. 65-69
An organic potting material, Epoxy Resin, was exposed to γ-rays at the liquid nitrogen temperature 77K and its mechanical properties such as elastic modulus, breaking stress, and breaking strain, were measured at the same temperature.
The gamma-irradiation exceeding 107R led to small reduction of elastic modulus, which was concluded due to the cleavage of principal chain of polymer. The frequency distribution of the measured values concerning structure-sensitive properties such as breaking stress and/or breaking strain was found not to fit the Gaussian curve after irradiation. This distribution had a tail component in the lower region, which suggested an introduction of “local” weak spots in potting material of the superconducting magnets during operation under irradiation.
