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Keywords: secondary crack
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Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1357
... ON THE FAILURE MODE OF SAMPLES Prefabricated joints play a vital important role in the fail- ure of the specimen. Previous experimental and numeri- cal results showed that three types of cracks develop from the pre-existing fissure (Fig. 3): wing cracks, quasi- coplanar secondary cracks, and oblique...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-629
... significant flow rate increase can be achieved through the fracture network generation in the process of fracture propagation and coalescence. In addition, both tensile wing cracks, shear and/or mixed-mode propagated secondary cracks can form during shear stimulation. These observations show that the so...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-179
... investigated. The propagating cracks contain first cracks and secondary cracks. Both first cracks and secondary cracks will disturb the stress field and displacement field. The DEM simulation explains the initiation position of secondary cracks observed in experiments, which is not necessarily located at the...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-675
... to be categorized, and the stress field inside the specimen is never fully revealed [1]. Most researchers simply describe them as secondary cracks without implying the mode of crack initiation. In this way the first cracks are commonly referred as primary cracks. So the words primary and secondary...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-252
... ABSTRACT: When cold fluid is injected into a hot reservoir, secondary cracks may be created perpendicular to the main crack. The difference between the temperature of the fluid in the main crack and the temperature of the formation along with the increase of pressure due to poroelasticity...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-134
... typical of tension cracks, and by the complete absence of pulverized material, which indicates the absence of shearing. Secondary cracks are shear cracks that initiate from the tips of a flaw and propagate in a stable manner. The surface of shear cracks is very rough and composed of crushed material...
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-06-930
... secondary cracks are observed in both monotonic and cyclic tests. Wing cracks, which are tension cracks, initiate at (or near) the tips of the flaws and propagate parallel to the compressive loading axis. Secondary cracks always appear after wing crack initiation and lead to final failure. Secondary cracks...
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 The 33rd U.S. Symposium on Rock Mechanics (USRMS), June 3–5, 1992
Paper Number: ARMA-92-0797
...: significant growth of the secondary cracks from i) pre-existing cracks (thin voids, which surfaces can contact due to loading) and ii) initial pores. It has been shown that initial pores are significantly weaker sources of the long secondary cracks than pre-existinH cracks and cannot be considered as the...
Proceedings Papers

Paper presented at the The 28th U.S. Symposium on Rock Mechanics (USRMS), June 29–July 1, 1987
Paper Number: ARMA-87-0383
... and ductile samples, secondary cracks developed from the tips of the original crack. The secondary cracks did not follow the plane of the original crack but formed an angle a with this plane. The angle of crack propagation a was greater in the brittle samples than in the ductile samples. The brittle...
Proceedings Papers

Paper presented at the 20th U.S. Symposium on Rock Mechanics (USRMS), June 4–6, 1979
Paper Number: ARMA-79-0153
... ABSTRACT ABSTRACT The large difference between material compressive and tensile strength plays the dominant role in the evolution of fracture in compressively loaded rock structures. The result of this strength mismatch, the strength-ratio effect, is the initiation of secondary cracks...
Proceedings Papers

Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0088
... from a combined analytical-finite element algorithm. This comparison showed that two types of cracking, primary and secondary, were responsible for structural failure. The mixed-mode propagation of primary cracks was well modeled by two of the theories. Secondary cracking could be predicted on the...

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