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Abstract
Fracture toughness and crack growth characteristics of stress corrosion cracking and fatigue were investigated for an isotropic fine grain size graphite, IG-11, one of the candidates for the core components of High Temperature Gas Cooled Reactors. The results obtained are summarized as follows:(1) The fracture toughness and the fracture resistance were reasonably described by using the stress intensity factor. Introduction of the J-integral as a parameter did not bring an increase in accuracy.(2) The plain strain fracture toughness KIc values for the fatigue precracked specimens were 0.93-1.00MPa√m. Without fatigue precracking, 10-20% decrease in fracture toughness was observed. In both cases, further crack growth brought an increase in the fracture resistance KR up to 1.05-1.25MPa√m.(3) The stress corrosion cracking did not occur in the material tested. On the other hand, the fatigue crack growth below KIc was observed although the crack growth mechanism is quite different from that for conventional metallic materials.
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