Measurement of Stress Waves Propagation in Percussive Drilling [PDF]
Sensors, 2021 This work describes the results of a test campaign aimed to measure the propagation of longitudinal, torsional, and flexural stress waves on a drill bit during percussive rock drilling.
Diego Scaccabarozzi, Bortolino Saggin
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Evaluation of the energy efficiency of rotary percussive drilling using dimensionless energy index
Journal of Rock Mechanics and Geotechnical Engineering, 2022 This paper sets forth a geomechanics framework for assessing the energy efficiency of rotary percussive drilling using the energy criterion, which has been proposed by Victor Oparin for volumetric destruction of high-stress rocks having nonuniform ...
Vladimir Karpov, Anton Konurin
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Impacted Bones: Can Extant Primates Help Identify Tool Use in Early Hominins? [PDF]
Evol AnthropolABSTRACT Despite recent advances pushing back the earliest record of tool use, how and when it first emerged in hominins, and the extent to which it featured amongst the numerous co‐existing species, remain critical questions in paleoanthropology. In addition to analyzing fossils and lithic toolkits, novel strides in understanding this might be made by
Hurwitz RM +3 more
europepmc +2 more sources
Bioinspired Drilling for Extraterrestrial Applications [PDF]
BiomimeticsThis review presents the novel synthesis of nature-inspired drilling strategies specifically tailored for extraterrestrial environments, where conventional technologies fail under the environmental conditions and power and mass constraints.
Gal-Erdene Battsengel +3 more
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Theoretical analysis and design of hydro-hammer with a jet actuator: An engineering application to improve the penetration rate of directional well drilling in hard rock formations. [PDF]
PLoS ONE, 2018 Rapid horizontal directional well drilling in hard or fractured formations requires efficient drilling technology. The penetration rate of conventional hard rock drilling technology in horizontal directional well excavations is relatively low, resulting ...
Jiang-Fu He +3 more
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Experimental-numerical method for evaluation of energy consumption in percussive drilling of granite [PDF]
EPJ Web of Conferences, 2021 Most geothermal energy is found in hot and dry rock (HDR), and the total resources distributed at depths of 3-10 km are 20.9×106 EJ. Most HDR projects are developed in granite formations and understanding and control of the energy consumption in ...
Yao Wei, Hokka Mikko
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Research on Impact Stress Transfer Characteristics of Lunar Rock Coring Drill
Shock and Vibration, 2021 In the whole lunar surface drilling and sampling task, it is critical to make the operation of the drilling and sampling impact system efficient and reliable.
Peng Li +4 more
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Energy Science & Engineering, 2021 Compound percussive drilling technology is a new method to improve the rock‐breaking efficiency in deep hard formation. In order to study the rock‐breaking mechanism of compound impact drilling, the thermal‐structure coupling simulation of the dynamic ...
Wei Wang +5 more
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IEEE Access, 2018 Compared with conventional drill, an ultrasonic drill can break into rocks under lower weight on bit and lower power, which is more suitable to sample in low gravity environment for deep-space exploration. However, the ultrasonic drill cannot remove rock
Yinchao Wang +5 more
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Energy Consumption Assessment of Percussive-Rotary Drilling in Hard Rock Massifs Based on Specific Fracture Energy [PDF]
E3S Web of ConferencesPercussive-rotary drilling is widely used for excavation in hard rock massifs, yet it suffers from high energy consumption and low efficiency. This study presents a comprehensive assessment of energy consumption in percussive-rotary drilling based on ...
Boranbay Ratov +5 more
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