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    Development of a standard method for determining the plane strain fracture toughness of rock

    Access Status
    Fulltext not available
    Authors
    Kuruppu, Mahinda
    Funatsu, T.
    Date
    2012
    Type
    Conference Paper
    
    Metadata
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    Citation
    Kuruppu, Mahinda and Funatsu, Takahiro. 2012. Development of a standard method for determining the plane strain fracture toughness of rock, in Kotousov, A. and Das, R. and Wildy, S. (ed), 7th Australasian Congress on Applied Mechanics (ACAM7), Dec 9-12 2012, pp. 877-883. Adelaide, SA: Engineers Australia.
    Source Title
    Advances in Applied Mechanics Research
    Source Conference
    7th Australasian Congress on Applied Mechanics
    ISBN
    9781922107619
    URI
    http://hdl.handle.net/20.500.11937/26763
    Collection
    • Curtin Research Publications
    Abstract

    A number of standard methods have been proposed to determine the Mode I plane strain fracture toughness of rock. The semi-circular bend (SCB) specimen has been widely used for fracture toughness determination of geomaterials owing to inherent favourable properties such as its simplicity, minimal requirement of machining and the convenience of testing. However, measurements of Mode I fracture toughness using SCB specimen have shown variability with specimen size. The minimum size requirements suggested by many theories are usually too large for practical applications. This research suggests an approximate, but relatively easily applied method, to satisfy the minimum size requirement. Fracture toughness of Kimachi sandstone was determined using the SCB specimen. By testing specimens of varying size, it was confirmed that the apparent fracture toughness increases with the specimen size. The trend line of the apparent fracture toughness displayed eventual stabilisation giving a value that can be considered as specimen size-corrected fracture toughness. This paper describes the method of determining the SCB specimen size-corrected fracture toughness and also highlights the advantages of using the SCB method over the other suggested standard methods.

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