Effects of strain rate and surface cracks on the mechanical behaviour of Balmoral Red granite

Ahmad Mardoukhi, Yousof Mardoukhi, Mikko Hokka, Veli-Tapani Kuokkala

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)

    Abstract

    This work presents a systematic study on the effects of strain rate and surface cracks on the mechanical properties and behaviour of Balmoral Red granite. The tensile behaviour of the rock was studied at low and high strain rates using Brazilian disc samples. Heat shocks were used to produce samples with different amounts of surface cracks. The surface crack patterns were analysed using optical microscopy, and the complexity of the patterns was quantified by calculating the fractal dimensions of the patterns. The strength of the rock clearly drops as a function of increasing fractal dimensions in the studied strain rate range. However, the dynamic strength of the rock drops significantly faster than the quasi-static strength, and, because of this, also the strain rate sensitivity of the rock decreases with increasing fractal dimensions. This can be explained by the fracture behaviour and fragmentation during the dynamic loading, which is more strongly affected by the heat shock than the fragmentation at low strain rates.
    Original languageEnglish
    JournalPhilosophical Transactions of the Royal Society A: Mathematical Physical and Engineering Sciences
    Volume375
    Issue number2085
    Early online date12 Dec 2016
    DOIs
    Publication statusPublished - 28 Jan 2017
    Publication typeA1 Journal article-refereed

    Keywords

    • Split Hopkinson Pressure Bar
    • rock
    • granite
    • dynamic loading
    • fractal dimension
    • surface cracks

    Publication forum classification

    • Publication forum level 2

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