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Griffith locus describing non-elastic behavior of hard rock is derived according to particular model of crack extension; general basis of theory is that elastic potential energy is converted to surface energy during failure of rock, by inefficient conversion process in which energy is dissipated by friction forces; most important aspects of this concept are that amounts of energy, large in relation to stored elastic strain energy, are necessarily dissipated during failure of rock, and that failed rock retains strength and cohesion during extensive non-elastic deformation; results imply that in drilling it is necessary to supply more energy to fracture and destroy cohesion of rock than to stress rock to point of failure.
Griffith locus describing non-elastic behavior of hard rock is derived according to particular model of crack extension; general basis of theory is that elastic potential energy is converted to surface energy during failure of rock, by inefficient conversion process in which energy is dissipated by friction forces; most important aspects of this concept are that amounts of energy, large in relation to stored elastic strain energy, are necessarily dissipated during failure of rock, and that failed rock retains strength and cohesion during extensive non-elastic deformation; results imply that in drilling it is necessary to supply more energy to fracture and destroy cohesion of rock than to stress rock to point of failure.
Failure of rock
Int J Rock Mechanics Min Sciences
Cook, N.G.W. (author)
1965
15 pages
Article (Journal)
English
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