Abstract
POCO HPD-1 graphite is a very fine-grained, high-density, nearly isotropic graphite. However, it becomes less isotropic and less dense during high temperature creep deformation. Changes in crystallographic orientation, density, and modulus were measured as functions of creep strain. The modulus changes induced by creep seem to be related to the orientation and density changes. Modulus values were intermediate between calculated values based on the constant-stress model and those based on the constant-strain model.
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