The flattened Brazilian disc specimen used for testing elastic modulus, tensile strength and fracture toughness of brittle rocks; analytical and numerical results

By Q. Wang, X. Jia, S. Kou, Z. Zhang, P. Lindqvist. 2004

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Measurement of mode I and mode II rock dynamic fracture toughness with cracked straight through flattened Brazilian disc impacted by split Hopkinson pressure bar (2011, background): “1), where two parallel flat ends are introduced to the circumference of CSTBD for load appliance [8], the flat ends cut on the disc periphery make the dynamic mode II loading especially favorable and convenient.”
Determination of mechanical properties and full-field strain measurements of rock material under dynamic loads (2013, methodology): “Compression BD st [21] std [11] UC suc [22] sucd [11] FBD st [33] std [34] HCFBD K IC [35] K Id [9] Finite element method Strain gauge SR K IC a [36] K Id [3] Quasi-static theory Moiré method CCNBD K IC a [23] K Id [37]”
Modified Formula for the Tensile Strength as Obtained by the Flattened Brazilian Disk Test (2016, methodology): “Based on the above analysis and results from previous studies (Wang et al. 2004; Yu et al. 2009), we used these three factors: 2a (loading angle), l (Poisson’s ratio), and h/r (thickness-toradius ratio), which were chosen as the experimental fac-”
Experimental and Numerical Studies on Development of Fracture Process Zone (FPZ) in Rocks under Cyclic and Static Loadings (2016, background): “With increasing load, secondary cracks develop and propagate until they reach the boundary, leading to final failure, or until they act as a ligament between primary cracks to cause a final failure plane (Wang et al. 2004).”