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Keywords: tensile crack
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0210
... brittle rock-like geomaterials. Upstream Oil & Gas Reservoir Characterization strength structural geology Williams Brazilian tensile strength determination ring test Queensland Alehossein metals & mining hard rock test method tensile crack brittle material tensile strength...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0366
... measurements allowed for the detection of crack initiation at the tip of the pre-existing flaw. The normalized wave amplitude was observed to decrease at initial loading stages because of micro-cracking followed by a sharp decrease in the rate of amplitude reduction due to tensile crack initiation. Digital...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0388
... state bottom flaw different uniaxial compression load Reservoir Characterization roughness specimen coalescence stress tensile crack fluid modeling frictionless interface oblique shear crack Coalescence geometry crack initiation Upstream Oil & Gas frictional interface shear crack...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-292
... boundary Microstructural Heterogeneity tensile crack grain-based model fracture 1. INTRODUCTION Microstructual heterogeneity plays a key role in controlling both the micromechanical behavior and the phenomenal response of crystalline rocks when subjected to external loadings. In crystalline...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0655
... tensile crack Reservoir Characterization Wellbore Design numerical analysis water pressure hydraulic fracturing mechanics geomechanics symposium specimen wellbore integrity inner flaw tip june 2016 Gonçalves da Silva geomechanics symposium geothermal reservoir experiment American Rock...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0504
... propagation on the specimen surface by measuring displacements during loading. The experimental results indicate that specimens with the smooth interface have lower initiation and coalescence stresses than with the rough interface. Also, a smooth interface seems to arrest tensile cracks reaching the interface...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-110
..., how properties of damaged materials (reduced elastic moduli and/or thermal conductivities) could affect damage evolution and tensile cracking in cement. It should be noted that, even though measuring elastic and thermal properties of intact cement, steel and rock is trivial, only an educated guess can...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-245
... plane shear) [1 11]. Two types of cracks have been observed in these experiments: tensile (wing) and shear (secondary) cracks, which are shown in Fig. 1. Tensile cracks initiate at or near the tip of the flaw. They propagate toward the direction of maximum compression and they are stable (i.e. further...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-675
... and are always caused by tensile failure, and the secondary cracks first emanate from the tips of the pre-existing flaw due to shear failure and then develop to a mixed shear and tensile cracking zone. analyzes the behavior of rock by treating it as an assembly of bonded particles [4-7]. Using simple...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7208
... follows the linear elastic relation. A parallel bond approximates the mechanical behavior of brittle elastic cement joining the two bonded particles. Bond will break once either the normal stress or shear stress exceeds the corresponding strength. For the former case, it is called a tensile crack and for...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7068
... material on crack propagation was analysed numerically. This characteristic has not yet been studied in crack propagation studies. The results obtained from open and closed flaws were in good agreement with experimental ones. All cracks mentioned in experimental literatures such as wing (tensile) cracks...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-339
... on the crack growth from a closed flaw (crack) under compression are investigated. The NMM can not only accurately predict the pure tensile or pure shear crack growth, but also satisfactorily predict the development of mixed shear-tensile crack types. The crack type is strongly influenced by the...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-593
... tensile crack inner flaw tip inner tip stress field hydraulic fracturing propagation marble specimen shear crack flaw tip crack initiation 1. INTRODUCTION The study of crack initiation and propagation is important for the understanding of rock mass behavior which affects many rock engineering...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-449
... coalescence tensile crack matrix 1. INTRODUCTION The cracking processes in a brittle material consisting of a matrix with inclusions are important mechanisms for both natural materials (rocks) as well as synthetic composite materials (e.g. concrete). There have been many past studies regarding the...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-369
... geomechanics flaw inclination angle construction materials Upstream Oil & Gas specimen Coalescence tensile crack flaw geometry right tip Reservoir Characterization inclination angle shear crack horizontal flaw coalescence crack coalescence stress flaw double-flawed specimen crack...
Proceedings Papers

Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-037
... followings were found. When the low viscous fluid is used, the fluid is infiltrated into the fracture instantaneously. On the other hand, when the highly viscous fluid is used, the fluid is infiltrated slowly into the crack after the fracture elongates first. Although the tensile cracks are dominantly...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-023
..., two types of anti-wing crack development were found which was not reported by the previous studies. One of the crack types was formed by the growth of petal cracks extending from the interior of the specimen to the surface, whiles the other crack type was formed by the growth of tensile cracks from...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-899
... failure TWC construction materials inclination angle initiation tensile crack tensile wing crack propagation 1. INTRODUCTION Systematic studies on prismatic pre-cracked molded Hydrocal-B11 gypsum specimens regarding crack propagation and coalescence patterns have been conducted over the past...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0731
... ABSTRACT: Two types of cracks are observed in brittle materials in compression: wing cracks and secondary cracks. Wing cracks are tensile cracks that initiate at the tips of pre-existing cracks (flaws) and propagate in a stable manner towards the direction of maximum compression. Secondary...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0843
... tensile cracks) could develop in the strained zone near the shear failure plane. Savilahti et al (1990) performed some direct shear tests to study the pattern of coalescence and shear strength of bridged rock mass using modelling material. The separation of joints was varied in both horizontal and...

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