... Abstract The pseudo-compact tension ( p CT) method recently proposed by Muñoz-Ibáñez et al. (2020) is a satisfactory approach to measure mode I fracture toughness ( K IC ) in rocks and other materials using disc-shaped samples loaded under pure tensile conditions. In contrast to other methods...

... (e.g. experimental configuration), the analyses of homogenous and isotropic materials is an useful approach. We have performed a series of mode I fracture toughness ( K IC ) tests using polymethyl methacrylate (PMMA) samples, which has the advantage of allowing photoelastic stress analysis based...

... Abstract It is essential to understand the mode I fracture toughness of rock under in situ conditions found underground, such as confining pressure, for assessment of the stability of underground rock structures. Some researchers have performed several types of fracture toughness tests...

... Abstract The objective of this study is to examine any variation from micro to macro scale mode-I fracture toughness of granite using micro-sized specimen and semi-circular specimen. The rock used in the tests is Iksan granite (Korea) which is composed of minerals, such as plagioclase...

... on their strength anisotropy. In the article, the anisotropy of a mechanical property, i.e. the fracture toughness, of migmatized gneiss is discussed. For this purpose, series of semi-circular bend tests were carried out on specimens of migmatized gneiss with a metamorphic foliation. The methodology used...

... geomechanical properties of rocks such as tensile strength (σ t ) and mode I fracture toughness ( K IC ). To validate the indirect tensile test by using the complete Brazilian disc, the crack must be initiated from the central region of the specimen, and the loading angle that corresponds to the arc...

... monsonite Ghamgosar toughness Erarslan hydraulic fracturing Brazilian test specimen fracture toughness test tensile strength Upstream Oil & Gas fracture toughness investigation rock type mechanics Engineering Rock mechanics tensile stress Laboratory Result Rock Mechanics...

... ABSTRACT: Mode I fracture toughness was determined under confining pressure for various rock types using sleeve fracturing laboratory experiments. In these experiments, a confining pressure was applied to rock cores with central axial boreholes. A polymer sleeve was pressurized inside...

... ABSTRACT: A brittle fracture of rocks occurs under subjected stress state. What parameters govern fracture in rock? It is considered that the fracture is dependent on not only distribution, orientation, size, shape and deformability of grains but also fracture toughness of grains and grain...

... were carried out using MTS rock test system with a loading rate of 0.002 mm/sec. Mean value of mode II fracture toughness of granite showed 2.33 MPa m 0.5 . Mode I toughness of the same granite was 1.12 MPa m 0.5 , determined by Brazilian disk test and K IIC /K IC = 2.08. The smooth fracture...

... Abstract Anisotropy of the physical properties such as elastic wave velocity, elastic modulus, strength, and fracture toughness of rocks should be understood to design and construct rock structures and estimate its stability. To investigate anisotropy in mode I fracture toughness ( K Ic...

... with uniaxial compressive strength; at larger depth of cut, brittle failure is dominant and the fracture toughness control the force responses. This study aims at assessing the strength within the ductile-mode cutting and the fracture toughness within brittle failure via rock scratching tests. First, we apply...

... Design reservoir geomechanics hydraulic fracturing injection pressure Upstream Oil & Gas fracture growth borehole SF experiment breakdown pressure ff experiment fracture length fracture mechanical evaluation diameter wellbore integrity stress intensity factor fracture toughness...

... Abstract The Cracked Chevron Notch Brazilian Disc (CCNBD) method has been used to determine rock fracture toughness value of rocks in rock mechanics since many years. The CCNBD method has advantages over the other proposed fracture toughness tests in terms of the simplicity of sample...

...Rock Engineering and Rock Mechanics: Structures in and on Rock Masses Alejano, Perucho, Olalla & Jiménez (Eds) © 2014 Taylor & Francis Group, London, 978-1-138-00149-7 Experimental evaluation of the fracture toughness on a limestone G. Suhett Helmer, J. Sulem & S. Ghabezloo Laboratoire Navier...

...), for the determination of quasi- static fracture toughness. However, the studies on fracture behaviours under dynamic loading have been less investigated. The testing methods are basically extended from the corresponding quasi-static ones and categorized approximately into Brazilian disc (BD), compact tension (CT...

.... Earlier measurements of rock fracture toughness followed the ASTM-E399 stan- dard method. Because most rock are brittle, fatigue pre-cracking required in ASTM standard has been found to be very difficult to produce (Chen, Pan & Amadei 1998). To solve rock fracture problems, The International Society...

... fracturing CCNBD specimen failure load foliation-loading angle phyllite Reservoir Characterization fracture core sample anisotropic brisbane phyllite fracture toughness tensile foliation plane splitting anisotropy Brisbane phyllite tensile strength Rock Mechanics for Resources, Energy...

... to investigate the influence of the surrounding water vapor environment on uniaxial compressive strength, tensile strength and fracture toughness. The rocks used in this paper were Kumamoto andesite, African granodiorite and Korean granite. It was made clear that rock strengths and fracture toughness...

... on Linear Elastic Fracture Mechanics (LEFM), if KI is equal to fracture toughness, KIC, the crack will propagate. By means of ABAQUS software, initiation and propagation of crack has been modeled. The crack tip elastic singularity (1/ r) has been taken into account by the use of the special crack tip...