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- W2019077509 abstract "ABSTRACT The effectiveness of percussive impacts when employed in mechanical rock excavation processes depends largely on the level of applied energy, relative to rock strength. Each brittle rock has its characteristic failure impact energy, herein christened the critical impact energy, at which fractures develop intensively. For a brittle rock, critical impact energy depends on its flaw size distribution and total porosity. Rebound measurements conducted with a specially designed fracture hammer on a variety of rocks correlated with ultrasonic pulse velocities as regards the indication of the regime of the critical impact energy for each rock tested. Single subcritical energy impacts deform rocks elastically, with minor crushing in the vicinity of the bit tip. Above the critical impact energy, deformation is largely plastic, manifested as intensive fracturing and crushing. The relationship between impact hammer rebound and rock failure phenomena conforms to the law of conservation of energy. The findings of this investigation have relevance to machinery development and improvement of mechanical excavation efficiency for surface mines, trenches and tunnels in hard rock." @default.
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- W2019077509 date "1991-01-01" @default.
- W2019077509 modified "2023-09-23" @default.
- W2019077509 title "Elastic to plastic impact transition in rock deformation" @default.
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- W2019077509 doi "https://doi.org/10.1080/09208119108944300" @default.
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