Effect Of Microstructure And Deformation Regimes On Anelasticity Of Water Ice - Implications For Europa, Enceladus, And Titan

Details Effect Of Microstructure And Deformation Regimes On Anelasticity Of Water Ice - Implications For Europa, Enceladus, And Titan Effect Of Microstructure And Deformation Regimes On Anelasticity Of Water Ice - Implications For Europa, Enceladus, And Titan

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5401c&link_type=abstract

American Astronomical Society, DPS meeting #42, #54.01; Bulletin of the American Astronomical Society, Vol. 42, p.1074

Physics

Scientific paper

Tidal dissipation is believed to be a major heat source in planetary bodies, however the physics of attenuation in planetary materials at satellite conditions remains to be constrained. So far, models of tidal dissipation in planetary moons neglect anelasticity (e.g., Maxwell body) and do not explicitly account for the microstructural mechanisms involved in internal friction. The Planetary Tides Simulation Facility (JPL) is dedicated to mapping the mechanisms driving attenuation as a function of temperature (220-270K) and cyclic peak stress (0.02-0.5 MPa) relevant to icy satellites. Attenuation spectra obtained for monocrystalline water ice over the frequency range 3x10-6 - 10-2 Hz and at a peak stress of 0.2 to 0.6 MPa can be systematically fitted with the Andrade model, whose parameter β can be written as an explicit function of defect density and mobility. We are exploring experimentally the applicability of this model to polycrystalline water ice samples deformed in the grain-boundary sliding (GBS) creep regime. Samples are synthesized from deionized H2O in the JPL Ice Factory, and compacted to 100 MPa to remove porosity. The microstructure before and after mechanical testing is assessed by optical analyses. Understanding the influence of the deformation regime on the attenuation of icy samples is essential to address tidal dissipation within icy shells of Europa (GBS), Enceladus (GBS or possible dislocation), and Titan (diffusion). We will present experimental results obtained so far in two regimes, theoretical predictions for the diffusion creep regime, and address their implications for tidal dissipation within icy satellites.
MC is supported by a NASA Postdoctoral Program Fellowship, administered by Oak Ridge Associated Universities. CW is supported by a NASA Space Grant, administered by the CalTech Student-Faculty Programs office. This work has been conducted at the Jet Propulsion Laboratory, California Institute of Technology, under a contract to NASA. Government sponsorship acknowledged.

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