Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-04-12
Physics
Nuclear Physics
Nuclear Experiment
26 pages, 9 figures
Scientific paper
On the basis of studies of radiation-induced shape-change of reactor graphite GR-280, through the series of measurements of samples with different orientation of cutting with respect to the direction of extrusion, a conclusion is made about the existence of polycrystal substructural elements - domains. Domains, like graphite as a whole, possess the property of transverse isotropy, but have different amplitudes of shape-change and random orientations of the axes of axial symmetry. The model of graphite, constructed on the basis of the concept of domains allowed to explain from a unified point of view most of existing experimental data. It is shown that the presence of the disoriented domain structure leads to the development of radiation-induced stresses and to the dependence of the shape-change on the size of graphite samples. We derive the relation between the shape-change of finite size samples and the actual shape-change of macro-graphite.
Arjakov M. V.
Ivanov O. V.
Kharkov D. V.
Panyukov S. V.
Pokrovskii A. S.
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