Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7965411 | Journal of Nuclear Materials | 2015 | 6 Pages |
Abstract
Changes in flexural strength and Weibull modulus due to specimen size were investigated for three nuclear graphite grades, IG-110, NBG-18, and PCEA, using four-point-1/3 point (4-1/3) loading with specimens of three different sizes: 3.18 (Thickness) Ã 6.35 (Width) Ã 50.8 (Length), 6.50 (T) Ã 12.0 (W) Ã 52.0 (L), 18.0 (T) Ã 16.0 (W) Ã 64 (L) (mm) (total: 210 specimens). Results showed some specimen size effects were grade dependent: While NBG-18 (a) showed rather significant specimen size effects (37% difference between the 3 T and 18 T), the differences in IG-110 and PCEA were 7.6-15%. The maximum differences in flexural strength due to specimen size were larger in the PCEA and NBG-18 having larger sized coke particles (medium grain size: >300 μm) than the IG-110 with super fine coke particle size (25 μm). The Weibull modulus showed a data population dependency, in that it decreased with increasing numbers of data used for modulus determination. A good correlation between the fracture surface roughness and the flexural strength was confirmed.
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Nuclear Energy and Engineering
Authors
Se-Hwan Chi,