Rock fracture toughness study using cracked chevron notched Brazilian disc specimen under pure modes I and II loading – A statistical approach

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Application of an average strain energy density criterion to obtain the mixed mode fracture load of granite rock tested with the cracked asymmetric four-point bend specimens (2017, background): “mixed mode I/II or mixed mode I/III fracture behaviour) of rocks [1-15].”
Rock Fracture Toughness Study Under Mixed Mode I/III Loading (2017, methodology): “…2015b, 2017) obtained from different conventional mode I test specimens such as SCB (Aliha and Ayatollahi 2013; Aliha et al. 2012a), straight centre cracked Brazilian disc (Aliha et al. 2012a) and the ISRM suggested chevron-notched Brazilian disc (Aliha and Ayatollahi 2014; Aliha et al. 2017).”
A Further Improved Maximum Tangential Stress Criterion for Assessing Mode I Fracture of Rocks Considering Non-singular Stress Terms of the Williams Expansion (2018, methodology): “2016a) SR method Direct tension Cracked chevron-notched Brazilian disc method (Fowell 1995; Xu and Fowell 1994; Aliha and Ayatollahi 2014; Dai et al. 2015,2016; Xu et al. 2016a, b; Chang et al. 2002) CCNBD method Brazilian-type compression”