Fracture toughness testing of geomaterials using semicircular specimen
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© 2018 ISRM International Symposium 2000, IS 2000. All rights reserved. Fracture mechanics is primarily used to predict the failure of structures made of engineering materials. Principles of fracture mechanics are applicable for improving the strength and stability of mine structures. However, fracturing is considered to be favourable in certain other applications such as blasting and comminution in mining and mineral processing. Fracture properties such as fracture toughness are useful for the fracture characterisation of a material irrespective of the type of application. Mode I fracture toughness is a material property that is related to the critical stress intensity factor in the crack opening mode. In this investigation, semi-circular bend test specimens having a chevron notch are used to determine the fracture toughness. The relationship between the stress intensity factor and crack length is determined using the finite element method. The fracture toughness is shown to correspond to the minimum level of the stress intensity factor associated with crack extension. Fracture toughness is evaluated in a number of rock types using the experimentally determined fracture load and the normalised stress intensity factor.
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Kuruppu, Mahinda; Obara, Y.; Ayatollahi, M.; Chong, K.; Funatsu, T (2014)A number of standard methods have been proposed to determine the Mode I fracture toughness of rock. They include those based on short rod (SR) specimen, chevron bend (CB) specimen and cracked chevron-notched Brazilian ...
Determination of Fracture Toughness of Anisotropic Rocks Under Water Vapour Pressure by Semi-Circular Bend TestKuruppu, Mahinda; Obara, Y.; Kataoka, M. (2010)Failure of rock materials is a process of crack propagation. Crack initiation takes place when the crack tip stress intensity K reaches a critical value called fracture toughness, K1C. The rock fracture toughness is known ...
He, J.; Pasternak, Elena; Dyskin, A.; Lebedev, Maxim; Gurevich, Boris (2017)© 2017 National Committee on Applied Mechanics. All Rights Reserved. Bridges which are unbroken materials connecting the opposite fracture faces usually exist in the hydraulic fractures as well as other cracks in geomaterials. ...