Subcritical crack growth of rocks using the double torsion method with consideration of the crack length

K. W. Kwok, R. H.C. Wong, Kam Tim Chau, T. F. Wong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The double torsion (DT) load relaxation test method has been widely used to study the subcritical crack growth (SCG) of rocks because the determination of the stress intensity factor KIis independent of the crack length. However, such disregard of the crack length may affect the results of SCG parameters obtained from the typical double torsion test seriously. Based on the analytical method with consideration of the crack length, the experimental results of this paper show that the stress corrosion index n and the logarithm of SCG parameter ν0are adjusted up to a factor of 2.2 and 2.0 respectively when the crack length is considered. As such influence on SCG parameters will affect the prediction of the long-term subcritical cracking of materials, it is concluded that DT data should be analyzed with consideration of the crack length. However, the corrective method of Ciccotti et al. (2001) requires complicated interpolations when analyzing double torsion test data. This paper simplifies the corrective method to predict the SCG parameters of rocks with suggested specimen sizes by developing charts and tables.
Original languageEnglish
Title of host publicationProceedings of the 1st Canada-US Rock Mechanics Symposium - Rock Mechanics Meeting Society's Challenges and Demands
Pages607-615
Number of pages9
Volume1
Publication statusPublished - 1 Dec 2007
Event1st Canada-US Rock Mechanics Symposium - Rock Mechanics Meeting Society's Challenges and Demands - Vancouver, BC, Canada
Duration: 27 May 200731 May 2007

Conference

Conference1st Canada-US Rock Mechanics Symposium - Rock Mechanics Meeting Society's Challenges and Demands
Country/TerritoryCanada
CityVancouver, BC
Period27/05/0731/05/07

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Civil and Structural Engineering

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