Physics – Geophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8511959s&link_type=abstract
Final Technical Report University of Southern California, Los Angeles. Center for Earth Sciences.
Physics
Geophysics
Creep Properties, Enstatite, High Temperature, Ice Formation, Icy Satellites, Natural Satellites, Oxygen, Rheology, Satellite Surfaces, Silicon Dioxide, Astronomical Models, Celestial Mechanics, Flow Distribution, Geophysics, Grain Boundaries, Iron, Terrestrial Planets, Thin Films
Scientific paper
High-temperature creep in orthoenstatite under conditions of controlled oxygen fugacity was studied. It was found that creep was conttrolled by the extremely thin layer of SiO2 which wetted the grain boundaries. Slight reduction of the (Mg, Fe)SiO3 enstatite during hot pressing produced microscopic particles of Fe and the thin film of intergranular SiO2. This result highlights another complication in determining the flow properties of iron bearing silicates which constitute the bulk of terrestrial planets and moons. The Phenomenon may be important in the ductile formation of any extraterrestrial body which is formed in a reducing environment. The rheology of dirty ice was studied. This involves micromechanical modeling of hardening phenomena due to contamination by a cosmic distribution of silicate particles. The larger particles are modeled by suspension theory. In order to handle the distribution of particles sizes, the hardening is readed as a critical phenomenon, and real space renormalization group techniques are used. Smaller particles interact directly with the dislocations. The particulate hardening effect was studied in metals. The magnitude of such hardening in ice and the defect chemistry of ice are studied to assess the effects of chemical contamination by methane, ammonia, or other likely contaminants.
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