Abstract
Fracture behavior of nuclear grade graphites was investigated under tensile-compressive stress distribution or stress gradient in front of inherent flaws in graphite materials, using the tension-bending bimodal strength test machine.Tensile, three and four point bending tests and fracture toughness test were carried out with notched specimens (width×thickness×gage length=20mm×10mm×60mm, notch length=0-5.2mm) made of fine grade isotropic graphite, IG-110 and coarse grained quasi-isotropic graphite, PGX, and the following conclusions were derived;(1) The following relationship between notch length, a and fracture strength, σf was well expressed as;σf=Aa-1/2, where A: constant.(2) Fracture toughness estimated by ASTM standard decreases as ligament ratio, a/W decrease in the range of a/W<0.05.(3) The highest fracture resistivity was observed in 3 point bending test and the lowest one was in tensile test.(4) Fracture toughness defined by on-set point of fracture can be evaluated in unique in these strength tests.
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