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The effect of fast neutron irradiation on the compressive stress-strain relationships of graphite

โœ Scribed by M. Birch; D.J. Bacon

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
513 KB
Volume
21
Category
Article
ISSN
0008-6223

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โœฆ Synopsis

A study of the effects of fast neutron irradiation on the mechanical properties of polycrystalline graphite is reported. Irradiation to a maximum dose of 1.14 x 10" n/cm2 at -50ยฐC increased the Young's modulus by 140%. The linearity of the compressive stress-strain curve increased and the hysteresis losses decreased. The fracture stress doubled, whilst the fracture strain decreased by -24%. Measurements of the total energy absorbed in compression indicated an average increase in the energy required for failure after irradiation. A constant elastic strain to failure criterion was found to be applicable for these irradiation conditions. Upon subsequent thermal annealing the Young's modulus decreased and had almost reached its unirradiated value by [email protected]. The fracture stress also decreased towards its unirrad~ted value and the hysteresis losses increased.

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