Results 91 to 100 of about 2,570 (205)
Lunar drill feasibility study Final report [PDF]
Low thrust rotary and percussive drills for sampling lunar ...
core +1 more source
Aspects of non-smooth dynamics in models of percussion [PDF]
, 2014 peer ...
Denoël, Vincent +2 more
core
Drilling process monitoring for a wealth of extra factual data from drillhole site investigation [PDF]
, 2006 This paper presents a method for obtaining valuable additional information from automatic drilling process monitoring in conventional drillhole site investigation.
Chen, J, Gao, W, Lee, CF, Yue, QZQ
core
Meitian dizhi yu kantanObjectiveWith continuously increasing coal mining depth, the risks of hazards such as roof collapse and personnel entrapment caused by high in situ stress and mining-induced pressure have significantly intensified.
Ningping YAO +6 more
doaj +1 more source
Drilling technology in mining industry [PDF]
Acta Montanistica Slovaca, 2006 The fundamental problem in rock working is the breakage of fragments out of the face of a solid rock wall rock. Mechanically, this can be done only by forcing a tool into the rock surface, after the manner of an indenter is commonly used in the testing ...
Loafi Messaoud
doaj
Shiyou jixieIn drilling engineering， optimized cutter selection for specific formations is critical to enhance rock breaking efficiency. To this end， a Split Hopkinson Pressure Bar （SHPB） apparatus was used to conduct impact-induced rock breaking tests of triangular-
Li Yunzhu +6 more
doaj +1 more source
The European Ultrasonic Planetary Core Drill: Preliminary Results from Field Trials at the Haughton Mars Project [PDF]
, 2016 This paper presents the findings of a recent field trip by the Ultrasonic Planetary Core Drill team to the Mars analog site at the Haughton Mars Project.
Harkness, Patrick +4 more
core
Advances in Materials Science and Engineering, 2016 The dynamic tensile behavior of granite samples, when some preexisting cracks are introduced artificially, is investigated. Spalling tests using a Hopkinson bar are performed and strain rates of ~102 1/s are obtained in both specimen types (with and ...
Mahdi Saadati +3 more
doaj +1 more source
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.
Jun Wang +6 more
doaj +1 more source
Study of sample drilling techniques for Mars sample return missions [PDF]
To demonstrate the feasibility of acquiring various surface samples for a Mars sample return mission the following tasks were performed: (1) design of a Mars rover-mounted drill system capable of acquiring crystalline rock cores; prediction of ...
Harris, P. T., Mitchell, D. C.
core +1 more source