scholarly journals Feasibility of Enceladus plume biosignature analysis: Successful capture of organic ice particles in hypervelocity impacts

2020 ◽  
Vol 55 (8) ◽  
Author(s):  
James S. New ◽  
Bahar Kazemi ◽  
Mark C. Price ◽  
Mike J. Cole ◽  
Vassi Spathis ◽  
...  
Keyword(s):  
Hypervelocity Impacts ◽  
Ice Particles ◽  
Successful Capture

scholarly journals Dynamics of the Ice-Crushing Process

1988 ◽  
Vol 34 (118) ◽  
pp. 318-326 ◽  
Author(s):  
Ian J. Jordaan ◽  
Garry W. Timco
Keyword(s):  
Ice Sheet ◽  
Load Cycle ◽  
Stored Energy ◽  
Indentation Process ◽  
Ice Particles ◽  
Mode Of Failure ◽  
Indentation Tests ◽  
Energy Exchanges ◽  
The Mean ◽  
Crushed Ice

Abstract During fast indentation tests on ice sheets at constant rates, crushing is commonly observed at appropriate combinations of speed and aspect ratio. An analysis is made of this mode of failure, using as a basis a recently conducted test on an ice sheet under controlled conditions. The variation of load with time is given special attention, and cyclic variation of load is associated with periodic crushing (pulverization) events, followed by clearing of the crushed ice particles. An analysis of the clearing process is summarized in the paper, treating the crushed ice as a viscous material. A detailed analysis of the energy exchanges during the indentation process is given. Elastic variations of stored energy in the indenter and in the ice sheet are calculated; these are relatively minor. The dissipation of energy during a typical load cycle (3 mm movement during 0.05 s) is about 8 J. The energy required to create surfaces of the crushed ice particles is small (0.006 J), as is the work of crushing based on mechanical testing (0.09 J). It is concluded that the process of viscous extrusion of crushed ice is the main seat of energy dissipation, basically as a frictional process. A relationship for the mean thickness of the crushed ice layer is developed, based on energy-balance considerations.

Direct numerical simulation of sublimating ice particles

2019 ◽  
Vol 145 ◽  
pp. 105953 ◽  
Author(s):  
M. Reitzle ◽  
S. Ruberto ◽  
R. Stierle ◽  
J. Gross ◽  
T. Janzen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Ice Particles

Detection and Analysis of RF Data from Hypervelocity Impacts

2011 ◽  
Author(s):  
Theresa Johnson ◽  
Alex Fletcher ◽  
David Lauben ◽  
Ivan Linscott ◽  
Sigrid Close ◽  
...  
Keyword(s):  
Hypervelocity Impacts
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