Effect of Stress Ratio on Crack Extension Rate of Fine-Grained Isotronic Nuclear Granhite

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概要

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• Effect of stress ratio on the crack extension rate da/dN was examined for an isotropic nuclear graphite IG-11, using tapered double cantilever beam specimens. Loads were applied to the specimens cyclically at a loading rate of 251 N/s in the load range where the stress ratio R range of 00.8. Here R is defined as the ratio of the minimum stress intensity factor K<SUB>min</SUB> to the maximum stress intensity factor K<SUB>max</SUB>. The rate da/<BR>dN was measured optically using a comparator. Conclusions derived as <BR>(1) For a given value of R, crack extension rate da/dN can be expressed as da/dN-=C(ΔK)<SUP>n</SUP>, <BR>here, ΔK is a stress intensity factor range, i.e. ΔK=K<SUB>max</SUB>-K<SUB>min</SUB>, and C and n are constants and strongly dependent on R value respectively. <BR>(2) Threshold stress intensity factor range ΔK<SUB>lh</SUB> which was defined as the point below which no crack extension more than 10 μm was observed after loadings of 10<SUP>5</SUP> cycles was related with R -values as <BR>ΔK<SUB>lh</SUB>/ΔK<SUB>lho</SUB>=(1-R)<SUP>0.89</SUP>, (ΔK<SUB>lho</SUB>=ΔK<SUB>lh</SUB> at R=0).

• 一般社団法人 日本原子力学会の論文

著者

• Eto Motokuni

  Department Of Materals Science And Engineering Tokai Research Estoblishment Japan Atomic Energy Rese

• Oku Tatsuo

  Department Of Biology Faculty Of Science Kyushu University

• ISHIYAMA Shintarou

  Department of High Temperature Engineering, Tokai Research Establishment, Japan Atomic Energy Research Institute

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