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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

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Comments on chevron bend specimen for
determining fracture toughness of rock
SUN Zong-qi(孙宗颀), CHEN Feng(陈 枫), XU Ji-cheng(徐纪成)

Instrument Test and Analysis, Central South University,
Changsha 410083, P.R.China

Abstract:Based on a number of tests on different rocks, Suggested Methods for Determining the Fracture Toughness of Rock (SMs) was reviewed. The advantages of SMs are obvious, but some problems are also discovered. A serious one is that the nonlinear corrected fracture toughness of chevron bend specimens, KCCB , is less than the uncorrected one, KCB , for hard rock like granite, marble and others. The reason is discussed and the proposal is given.

 

Key words: fracture toughness; nonlinear correction

ISSN 1672-7029
CN 43-1423/U

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