Deep drill (DeeDri) for Mars application

Magnani, Piergiovanni; Re, E.; Ylikorpi, Tomi; Cherubini, Giovanni; Olivieri, A.

doi:10.1016/j.pss.2003.08.023

Cited by 30 publications

(14 citation statements)

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“…However, once the friction coefficient increases to 0.5 (and such a high coefficient of friction was previously recorded), the power increases to 50 Watts. An increase of 40 Watts is quite significant, given that the total drilling power in basalt was measured to be 38 Watts [ Magnani et al , 2004] and 85 Watts (measured in basalt coring tests conducted by the authors).…”

Section: Resultsmentioning

confidence: 99%

Friction of drill bits under Martian pressure

Zacny

Cooper

2007

J. Geophys. Res.

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[1] Frictional behavior was investigated for two materials that are good candidates for Mars drill bits: Diamond Impregnated Segments and Polycrystalline Diamond Compacts (PDC). The bits were sliding against dry sandstone and basalt rocks under both Earth and Mars atmospheric pressures and also at temperatures ranging from subzero to over 400°C. It was found that the friction coefficient dropped from approximately 0.16 to 0.1 as the pressure was lowered from the Earth's pressure to Mars' pressure, at room temperature. This is thought to be a result of the loss of weakly bound water on the sliding surfaces. Holding the pressure at 5 torr and increasing the temperature to approximately 200°C caused a sudden increase in the friction coefficient by approximately 50%. This is attributed to the loss of surface oxides. If no indication of the bit temperature is available, an increase in drilling torque could be misinterpreted as being caused by an increase in auger torque (due to accumulation of cuttings) rather than being the result of a loss of oxide layers due to elevated bit temperatures. An increase in rotational speed (to allow for clearing of cuttings) would then cause greater frictional heating and would increase the drilling torque further. Therefore it would be advisable to monitor the bit temperature or, if that is not possible, to include pauses in drilling to allow the heat to dissipate. Higher friction would also accelerate the wear of the drill bit and in turn reduce the depth of the hole.

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Section: Resultsmentioning

confidence: 99%

Friction of drill bits under Martian pressure

Zacny

Cooper

2007

J. Geophys. Res.

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“…The drilling produced temperature increase was also analysed (Szwarc et al 2012), and the use of single drills as well as multiple rods were demonstrated that might be successful under Mars like conditions (Magnani et al 2004). Autonomous decisions and performance were also tested (Glass et al 2008) what is required to realize a drill on Mars, however teleoperation from Martian orbit may be also possible in the future (Glass et al 2012;Lee et al 2009).…”

Section: Background Information: Drilling On Earth and Marsmentioning

confidence: 99%

Characterization and first results of the planetary borehole-wall imager — methods to develop for in-situ exploration

et al. 2019

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Prototypes of borehole-wall imager instruments were developed and tested at a desert riverbed in Morocco and at a lake’s salty flat in the Atacama desert, to support the drilling activity of ExoMars rover. The onsite recorded borehole images contain information on the context that are lost during the sample acquisition. Benefits of the borehole-wall imaging is the easier maximal energy estimation of a fluvial flow, the detailed information on sedimentation and layering, especially the former existence of liquid water and its temporal changes, including paleo-flow direction estimation from grain imbrication direction. Benefits of laboratory analysis of the acquired samples are the better identification of mineral types, determination of the level of maturity of granular sediment, and identification of the smallest, wet weathered grains. Based on the lessons learned during the comparison of field and laboratory results, we demonstrate that recording the borehole-wall with optical instrument during/after drilling on Mars supports the paleo-environment reconstruction with such data that would otherwise be lost during the sample acquisition. Because of the lack of plate tectonism and the low geothermal gradient on Mars, even Ga old sediments provide observable features that are especially important for targeting Mars sample return and later crewed Mars missions.

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“…This system is capable of retrieving cores samples 14mm in diameter and 25mm in length. Single rod design is suitable for 1m depth, weighing 7.32Kg and multirod design is suitable for 3m depth-weighing 8.3Kg [4]. Nasa has developed a low power (~60 W) and low mass (~20 Kg) drill that is capable of retrieving samples of diameter 20mm from the permafrost regions of earth and Mars.…”

Section: Drillingmentioning

confidence: 99%