| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1564648 | Journal of Nuclear Materials | 2016 | 10 Pages |
Abstract
The fracture behaviors of six nuclear graphite grades for a high-temperature gas-cooled reactor (HTGR), which differed in coke particle size and forming method, were characterized based on the ASTM standard graphite fracture toughness test method (ASTM D 7779-11) at room temperature. The G appeared to show good correlation with the fracture surface roughness and the G-Îa curves appeared to describe the fracture process well from crack initiation to failure. Comparison of the local (KIC) and gross (GIC, G-Îa) fracture parameters showed that the resistance to crack initiation and propagation was higher in the extruded or vibration molded medium particle size grades (PCEA, NBG-17, NBG-18: EVM group) than in the iso-molded fine particle size grades (IG-110, IG-430, NBG-25: IMF group). The ASTM may need to provide a guideline for G-Îa curve analysis. The KIC appeared to increase with specimen thickness (size).
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Se-Hwan Chi,