Fracture Toughness and Crack Growth Resistance of the Fine Grain Isotropic Graphite

Three point bending tests of single edge notched beam (SENB) specimens were carried out to evaluate the fracture behavior of the fine-grain isotropic nuclear grade graphite, IG-11. To measure the crack initiation point and the subsequent crack growth, the direct current potential drop (DCPD) method and a traveling microscope were used. The effects of test variables like initial crack length, specimen thickness, notch type and loading rate on the measured fracture toughness, $K_Q$, were investigated. Based on the test results, the ranges of the test variables to measure the reliable fracture toughness value were proposed. During the crack growth, the rising R-curve behavior was observed in IG-11 graphite when the superficial crack length measured on the specimen surface was used. The increase of crack growth resistance was discussed in terms of crack bridging, crack meandering, crack branching, microcracking and crack deflection, which increase the surface energy and friction force.
Publisher
한국탄소학회
Issue Date
2006-10
Language
ENG
Citation

CARBON LETTERS , v.7, no.1, pp.19 - 26

ISSN
1229-9103
URI
http://hdl.handle.net/10203/6181
Appears in Collection
NE-Journal Papers(저널논문)
Files in This Item
2006Carbon Science_KAIST_final.pdf(718.44 kB)Download
  • Hit : 576
  • Download : 524
  • Cited 0 times in thomson ci

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0