Abstract
Pressure Stimulated Current (PSC) experiments were conducted on marble samples to correlate PSC with the damage parameter, D. The phenomena and procedures taking place in the vicinity of the fracture limit were observed and analytically described. PSC recordings were conducted by application of uniaxial compressional stress, both at a constant stress rate and at a constant deformation rate. A linear relationship was shown to exist between the emitted PSC and the damage parameter which quantifies the deviation from linear elasticity and the concentration of microcracks.
Highlights
IntroductionIn order to understand the mechanisms that produce these electric signals, a number of laboratory experiments of mechanical distress to fracture have been conducted on minerals and rocks (dry and saturated) (Nitsan, 1997; Ogawa and Miura, 1985; Enomoto and Hashimoto, 1990; Hadjicontis and Mavromatou, 1994; O’Keefe and Thiel, 1995; Takeuchi and Nagahama, 2001)
Phenomena associated with fracture, those concerning materials of inhomogeneous structure, such as geomaterials, in combination with occurring transient electric phenomena, have always attracted the interest of the scientific community (Hayakawa and Fujinawa, 1994; Hayakawa, 1999)
These experiments have been combined with numerous studies and recordings of acoustic emissions (Tonolini et al, 1987) due to mechanical stress cause microcracking in rocks as well as the Kaiser effect which takes place in rocks and materials subjected to cyclic loading/unloading (Kaiser, 1953; Beattie, 1983; Lavrov, 2003)
Summary
In order to understand the mechanisms that produce these electric signals, a number of laboratory experiments of mechanical distress to fracture have been conducted on minerals and rocks (dry and saturated) (Nitsan, 1997; Ogawa and Miura, 1985; Enomoto and Hashimoto, 1990; Hadjicontis and Mavromatou, 1994; O’Keefe and Thiel, 1995; Takeuchi and Nagahama, 2001) These experiments have been combined with numerous studies and recordings of acoustic emissions (Tonolini et al, 1987) due to mechanical stress cause microcracking in rocks as well as the Kaiser effect which takes place in rocks and materials subjected to cyclic loading/unloading (Kaiser, 1953; Beattie, 1983; Lavrov, 2003).
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