Results 1 to 10 of about 13,275 (112)
Effect of Bit Configuration in Impact Penetration Tests with Button Bits
Journal of MMIJ, 2016 Computer simulation of percussive rock drilling requires appropriate numerical models for the interactions among the drill body, rod, rod joint, bit, and rock.
Katsunori Fukui
exaly +5 more sources
Journal of Rock Mechanics and Geotechnical EngineeringThis paper focuses on the use of rotary-percussive drilling for hard rocks. In order to improve efficiency and reduce costs, it is essential to understand how operational parameters, bit wear, and drilling performance are related.
Qian Fang, Jiayao Chen, Guoli Zheng
exaly +4 more sources
Management and analysis of complications associated with all‐inside technique anterior cruciate ligament reconstruction: A propensity score‐matched study [PDF]
Journal of Experimental OrthopaedicsPurpose To investigate the incidence and management of complications associated with all‐inside technique (AIT) anterior cruciate ligament reconstruction (ACLR), and to compare postoperative outcomes between patients with successfully managed ...
Yang Tang +8 more
doaj +2 more sources
Numerical Simulation of Drilling with Button Bit.
Shigen-to-Sozai, 2000 Development of a powerful hydraulic rotary / percussive drill motivates improvement of drill rods and bits. Recently a button bit is preferably used for its durability and high maximum drilling rate. However, its penetration / rock-breaking mechanism is so complicated and many parameters are involved, then very few fundamental studies have been ...
Seisuke Okubo, Katsunori Fukui
exaly +3 more sources
Force-Penetration Curves with a Button Bit in the Percussive Drilling
Journal of MMIJ, 2010 A force-penetration relationship is considered to be closely related to the deformation and fracture mechanism at the bit-rock interface. In this study, a testing machine in which a piston, a rod or a bit can be easily changed was developed for laboratory impact-penetration test simulating the in-situ percussive drilling.
Seisuke Okubo, Katsunori Fukui
exaly +3 more sources
Force-Penetration Curves with a Worn Button Bit in the Percussive Long-Hole Drilling
Journal of MMIJ, 2008 A force-penetration relationship is considered to be closely related to the deformation and fracture mechanism at the bit-rock interface. In this study, a series of percussive long-hole drilling tests using Inada granite were carried out to examine the effects of hole length on drilling performace.
Seisuke Okubo, Katsunori Fukui
exaly +4 more sources
Applied SciencesDown-the-hole (DTH) hammer drilling has high rock-breaking efficiency and a decisive advantage in hard rock drilling, which can reduce the cost of geothermal drilling.
Hongyu Ye +5 more
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Analysis of drill bit speed in bit-rock interaction with the use of numerical simulation methods [PDF]
E3S Web of Conferences, 2020 Bit-rock interaction while drilling wells using numerical simulation methods is analyzed in the article. The effect of the location of the buttons relative to the destruction of the rock, the influence of the structure on the total speed of the drill bit
Toshniyozov Lazizjon, Mamatov Muhriddin
doaj +1 more source
Journal of Hand Surgery Global Online, 2022 Purpose: To evaluate the possibility of posterior interosseous nerve (PIN) injury during cortical button deployment and seating associated with bicortical drilling and passage of the cortical button across the distal cortex when repairing a distal biceps
Brian Lynch, MD +3 more
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Design and Development of GUI for the Mitigation of Chromatic Dispersion: A New Approach
Sukkur IBA Journal of Emerging Technologies, 2022 Chromatic Dispersion (CD) is the important effect that is considering for optical communication system design as it broadens the pulse during the propagation along channel resulting in pulse overlapping and ultimately bit errors raises. The increment in
Bhagwan Das +3 more
doaj +1 more source