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- W141103383 abstract "The characteristics of fracture toughness, fracture resistance and fatigue crack growth were investigated for three isotropic fine grain size graphites, IG-11, IG-110 and IG-110U, the candidates for the core components of High Temperature Gas Cooled Reactors. The results obtained are summarized as follows: The fracture toughness and fracture resistance are reasonably described by using the stress intensity factor. Consideration of the elastic-plastic behavior by the J-integral does not make any difference in accuracy. A conventional specimen size requirement for the metallic materials can be extended to the graphite materials by replacing the yield stress with the tensile strength. The crack initiates from a corner of the notch root near the specimen surface. If this effect is considered in the stress intensity factor, K, calculation, the fracture resistance becomes almost constant except for the final stage of crack growth where the specimen size requirements are not satisfied. The KIC values in vacuum increase slightly with increasing temperature up to 820 ° C. At room temperature, the fracture toughness, KIc, in air is lower than that in vacuum. So, the former can be used for the conservative estimation of the structural integrity under the service conditions. The fatigue crack grows below KIc. The crack growth mechanism proved quite different from that for conventional metallic materials." @default.
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- W141103383 date "1992-01-01" @default.
- W141103383 modified "2023-10-18" @default.
- W141103383 title "Evaluation of Fracuture Mechanics Characteristics of High Strength Graphites IG-11" @default.
- W141103383 doi "https://doi.org/10.1016/b978-0-08-037890-9.50414-2" @default.
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