Fracture mechanical aspects of dust emission processes from a model comet surface

Details Fracture mechanical aspects of dust emission processes from a model comet surface Fracture mechanical aspects of dust emission processes from a model comet surface

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..121r&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 121-128 (SEE N90-19989 12-90)

Physics

1

Comets, Crustal Fractures, Environment Simulation, Fatigue (Materials), Fracture Mechanics, Astronomical Models, Comet Nuclei, Dust, Erosion, Particle Emission

Scientific paper

Laboratory space simulation experiments are reported. High resolution video records taken from the virgin surface of a model comet in the small simulation chamber at the DLR showed a highly structure, rough surface during irradiation with artificial sunlight. The observations demonstrated that the surface itself is not calm, but partially in motion. Particles vibrate within the gas jet originating from sublimation of ice. After a certain time they lift off. Particles which are obviously bonded to the surface loose after a certain time the bonds to their neighbors until they are free and accelerated by the gas jet. The observations show that the commonly considered view of dust emission processes by gravity force dominated particles has to be revised as well as the supposition of loosely deposited particles at fresh surfaces without any bonding. Model calculations of bond strength based on material parameters of ice show that these can be orders of magnitude higher than the gravity force. The mechanisms observed are analyzed with fracture mechanical models, which are also applicable to the fracture of a cometary crust.

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