Loading rate dependency of dynamic fracture toughness of rocks

Sang Ho Cho, Min Seong Kim, Hyeong Min Kang, Minami Kataoka, Yuzo Obara, Kwangmin Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


In this study, straight notched disk bending (SNDB) specimens of Yeongju granite were used to determine the fracture toughness with wide range of loading velocity from 0.01 to 680, 000 mm/mm. The SNDB specimens were dynamically loaded with the split Hopkinson pressure bar (SHPB) system. Static fracture toughness values of the granites were also determined to compare with the dynamic fracture toughness. The measured fracture toughnesses K1c under the static and dynamic loading condition were plotted against the loading rate v on a logarithmic graph. The crack opening behavior around the tip of the notch during dynamic loading was observed by using a high speed digital camera. The fracture planes around the notch tip inside the tested samples were observed by a high-resolution microfocus X-ray CT scanner.

Original languageEnglish (US)
Title of host publication49th US Rock Mechanics / Geomechanics Symposium 2015
PublisherAmerican Rock Mechanics Association (ARMA)
Number of pages5
ISBN (Print)9781510810518
StatePublished - 2015
Event49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States
Duration: Jun 29 2015Jul 1 2015


Other49th US Rock Mechanics / Geomechanics Symposium
Country/TerritoryUnited States
CitySan Francisco

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology


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