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    Experimental and numerical investitaions on mixed mode fracturing of concrete and rocks by using semi-Circular Disc (SCD) and Disc Specimens
    (American Rock Mechanics Association (ARMA), 2015) Erarslan, N.; Obligado, R.; Li, Z.; Ghamgosar, M.
    Sudden and violent fracturing of brittle materials, such as natural-forming rocks and artificial aggregates like concretes, still remain one of the leading causes of fatalities in mining, civil and geotechnical industries today. The primary aim of this research work is to investigate the mixed modes I (tensile) and II (shearing) fracturing mechanisms of Brisbane Tuff rock and prepared concrete samples using Semi-Circular Disc (SCD) and Cracked Chevron-Notched Brazilian Disk (CCNBD) specimen geometries. In order to create various mixed mode loading conditions, the chevron notch cracks of the CCNBD specimens were oriented at notch crack inclination angles, ?, of 0°, 30°, 45°, and 70° as part of the diametral testing procedure, whilst the SCB specimens were cut at the same ?s prior to conducting the three-point bending tests. The experimental study revealed that the CCNBD geometry and the Brisbane Tuff rock have higher failure loads than the SCD geometry and concrete sample counterparts. Following the experiments, a series of numerical analyses were then performed using FRANC2D software to simulate the stress distributions and fracturing behaviour of the samples at different ? values. Overall, this investigation showed ?, and hence the mixed mode loading condition, is a function of failure load, stress distributions, position of the pre-existing cracks relative to the major principal stress and fracturing behaviour of brittle materials. Copyright 2015 ARMA, American Rock Mechanics Association.