高強度黒鉛材料IG-11の破壊力学的特性の評価

概要

論文の詳細を見る
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 K~ values for the fatigue precracked specimens were 0.93-1.00 MPa√<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 K_R up to 1.05-1.25 MPa√<m>. (3) The stress corrosion cracking did not occur in the material tested. On the other hand, the fatigue crack growth below K<IC> was observed although the crack growth mechanism is quite different from that for conventional metallic materials.
社団法人日本材料学会の論文
1988-08-15