BEM Analysis of a Cylindrical Three Point Bend Specimen with a Chevron Crack for Fracture Toughness Test of Rock

Kazuo Hayashi, Akihiko Ono, Hiroyuki AbÉ

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The stress intensity factor along the periphery of a chevron crack in a cylindrical three point bend specimen (CB) is evaluated by BEM for the establishment of the rock fracture toughness test using CB specimens. So far, in the test, the stress intensity factor is assumed to be constant along the front edge of the crack and is evaluated by the compliance method. It is revealed from the present analysis that the stress intensity factor takes a minimum value at the center of the front edge so that the crack growth during the fracture toughness test makes the front edge of the crack concave. It is also shown that the stress intensity factor evaluated by the compliance method is larger than that of the concave crack with a homogeneous distribution of the stress intensity factor along the front edge. This implies that the fracture toughness test leads to over estimation.

Original languageEnglish
Pages (from-to)1541-1545
Number of pages5
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Volume54
Issue number504
DOIs
Publication statusPublished - 1988

Keywords

  • CB specimen
  • Elasticity
  • chevron crack
  • fracture
  • fracture toughness of rock
  • fracture toughness test
  • stress intensity factor

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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