Trajectories of unstably growing cracks in mixed mode I?II loading of marble beams

Evaluating the Applicability of Fracture Criteria to Predict the Crack Evolution Path of Dolomite Based on SCB Experiments and FEM

“…Many researches have been conducted to describe crack initiation and crack propagation under mixed-mode loading. For example, Jia et al [3] conducted a series of mixedmode fracture experiments using center cracked circular disc (CCCD) specimens to observe the fracture path of concrete under mixed mode I/II loading; Xeidakis et al [4] investigated the trajectory of crack growth for marble using antisymmetric three-point bend specimens under different mixed mode loading conditions; Bobet and Einstein [5] studied the fracture initiation, propagation, and, ultimately, coalescence (which plays an important role in the behavior of brittle materials) by loading prefractured specimens of gypsum, used as the rock model material, in uniaxial and biaxial compression; Chen et al [6] conducted a set of fracture experiments on anisotropic shale by using CCCD specimens under different mixed mode loading conditions for studying the fracture initiation path and also employed the numerical technique of boundary element method to simulate the observed fracture paths. Vásárhelyi and Bobet [7] investigated the crack initiation stress, direction, and propagation of newly generated cracks for both open and closed fractures; Wong et al [8] numerically investigated the crack initiation, propagation, and coalescence of rock specimens containing preexisting crack-like flaws under compression by using Rock Failure Process Analysis (RFPA 2D ); Al-shayea [9] studied the crack initiation angle and subsequent crack propagation path experimentally for notched Brazilian disk specimens of limestone; Liu et al [10] used a numerical method for modeling the mixed mode fracture process of heterogeneous rocks using different test samples including CCCD specimens.…”

Brittle fracture of rock under combined tensile and compressive loading conditions

“…The theoretical predictions presented in this study move one step forward than the available analytical solutions for the angled crack subjected to general bi-axial load and agree well with those from experimental tests. (Aliha et al 2012;Amarasiri et al 2011;Bakuckas et al 1993;Broberg 1987;Castro et al 2016;Eftis and Subramonian 1978;Erarslan and Williams 2013;Funatsu et al 2014;Mirsayar 2014;Park and Bobet 2009;Wu and Wong 2012;Wu and Wong 2013;Xeidakis et al 1997). However, relatively little is known about cracking phenomena in brittle materials such as rock under combined tensile and compressive loads.…”

Determination of crack initiation and propagation in two disc shaped specimens using the improved maximum tangential stress criterion

“…Therefore, investigating the crack initiation angle and the crack propagation path under the mixed loading mode are favorite subjects for researchers in the field of rock mechanics. There are a large number of theoretical models (Erdogan and Sih, 1963;Hussain et al, 1974;Nuismer, 1975;Palaniswamy and Knauss, 1972;Sih, 1974;Theocaris and Andrianopoulos, 1982) and experimental techniques (Grassl and Rempling, 2007;Isaksson and Ståhle, 2002;Lin et al, 2009;Song et al, 2004;Xeidakis et al, 1997) for investigating the mixed mode of crack growth in rock materials. Theoretical failure criteria such as the Maximum Tangential Stress (MTS) criterion (Erdogan and Sih, 1963), the minimum strain energy density criterion (Sih, 1974), and the maximum energy release rate criterion (Hussain et al, 1974) have been frequently used by researchers working on rock and geo-material fields in order to estimate the direction of the mixed mode in the crack growth process.…”