The effects of specimen geometry and size on the fracture toughness of nuclear graphites

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In a joint Oak Ridge National Laboratory (ORNL)/Japan Atomic Energy Research Institute (JAERI) study, various fracture toughness techniques were applied to Toyo Tanso grade IG-110 graphite to establish if specimen geometry influences on fracture toughness. The test geometries investigated were: compact tension (CT), disc compact tension (DCT), short rod (SR), chevron-notched short-red (CNSR), cylindrical bend specimen (BS), and centrally slotted disc (CSD). Specimen geometries which allow slow crack propagation, such as the CNSR and CT, yielded higher fracture toughness values than those where fracture is very rapid, e.g., the CSD. In a further ORNL study, the CNSR specimen geometry was ... continued below

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Romanoski, G.R. & Burchell, T.D. January 1, 1991.

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In a joint Oak Ridge National Laboratory (ORNL)/Japan Atomic Energy Research Institute (JAERI) study, various fracture toughness techniques were applied to Toyo Tanso grade IG-110 graphite to establish if specimen geometry influences on fracture toughness. The test geometries investigated were: compact tension (CT), disc compact tension (DCT), short rod (SR), chevron-notched short-red (CNSR), cylindrical bend specimen (BS), and centrally slotted disc (CSD). Specimen geometries which allow slow crack propagation, such as the CNSR and CT, yielded higher fracture toughness values than those where fracture is very rapid, e.g., the CSD. In a further ORNL study, the CNSR specimen geometry was selected to investigate the effect of specimen size on fracture toughness. Three specimen sizes and three grades of graphite were examined: Great Lakes Carbon grade H-451, Stackpole grade 2020, and Toyo Tanso grade IG-110. Grade H-451 was the toughest graphite, while Stackpole 2020 was the least tough. Fracture toughness increased with increasing specimen size for all graphites tested. This result was attributed to rising R-curve behavior. 13 refs., 8 figs., 3 tabs.

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Pages: (14 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • International Atomic Energy Agency (IAEA) specialists meeting on status of graphite development for gas-cooled reactors, Tokai (Japan), 9-12 Sep 1991

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  • Other: DE92000056
  • Report No.: CONF-9109266-1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5289011
  • Archival Resource Key: ark:/67531/metadc1068872

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  • January 1, 1991

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 2, 2018, 7:58 p.m.

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Romanoski, G.R. & Burchell, T.D. The effects of specimen geometry and size on the fracture toughness of nuclear graphites, article, January 1, 1991; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1068872/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.