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    ISRM-Suggested Method for Determining the Mode I Static Fracture Toughness Using Semi-Circular Bend Specimen

    197537_197537.pdf (841.9Kb)
    Access Status
    Open access
    Authors
    Kuruppu, Mahinda
    Obara, Yuzo
    Ayatollahi, Majid
    Chong, Ken
    Funatsu, Takahiro
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kuruppu, Mahinda and Obara, Yuzo and Ayatollahi, Majid and Chong, Ken and Funatsu, Takahiro. 2014. ISRM-Suggested Method for Determining the Mode I Static Fracture Toughness Using Semi-Circular Bend Specimen. Rock Mechanics and Rock Engineering. 47: pp. 267-274.
    Source Title
    Rock Mechanics and Rock Engineering
    DOI
    10.1007/s00603-013-0422-7
    ISSN
    07232632
    URI
    http://hdl.handle.net/20.500.11937/46814
    Collection
    • Curtin Research Publications
    Abstract

    The International Society for Rock Mechanics has so far developed two standard methods for the determination of static fracture toughness of rock. They used three different core based specimens and tests were to be performed on a typical laboratory compression or tension load frame. Another method to determine the mode I fracture toughness of rock using semicircular bend specimen is herein presented. The specimen is semicircular in shape and made from typical cores taken from the rock with any relative material directions noted. The specimens are tested in three-point bending using a laboratory compression test instrument. The failure load along with its dimensions is used to determine the fracture toughness. Most sedimentary rocks which are layered in structure may exhibit fracture properties that depend on the orientation and therefore measurements in more than one material direction may be necessary. The fracture toughness measurements are expected to yield a size-independent material property if certain minimum specimen size requirements are satisfied.

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      A number of standard methods have been proposed to determine the Mode I fracture toughness of rock. They include those based on short rod (SR) specimen, chevron bend (CB) specimen and cracked chevron-notched Brazilian ...
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