Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmmr31b..07m&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #MR31B-07
Physics
[3904] Mineral Physics / Defects, [3909] Mineral Physics / Elasticity And Anelasticity, [5422] Planetary Sciences: Solid Surface Planets / Ices, [6218] Planetary Sciences: Solar System Objects / Jovian Satellites
Scientific paper
The dissipation of tidal energy is considered a significant source of heating within many of the moons of the outer solar system. Models of heat flow on icy satellites require a better understanding of the underlying microstructural parameters that influence the magnitude and mechanisms of anelastic dissipation in ice. Our experimental studies have explored the attenuation and potential heat production of polycrystalline ice at conditions approaching those of icy satellites. We find that in ice experiencing simultaneous cyclic and unidirectional loading at low frequencies, attenuation is due to a combination of grain boundary sliding and oscillating lattice dislocations. As such, the magnitude of energy dissipation is strongly tied to the density and mobility of dislocations, which can evolve with strain and with strain-amplitude. Ice undergoing cyclic loading displays a gradual increase in attenuation with increased strain. As more dislocations are generated and loaded into the system, the total length of oscillating dislocations in the complex three-dimensional web increases. However, samples that were passed thru an angular extrusion die (thereby experiencing over 60% strain) before dynamic testing were found to be less dissipative than non-extruded samples. This suggests a threshold, beyond which dislocations become too entangled. In addition, a complicated grain size dependence of damping observed in our studies indicates that an additional interaction between dislocations and grain (and subgrain) boundaries exists. We will report about the role of accumulated strain in the ice response and explore what that means for icy satellite thermal dynamics and evolution.
Castillo Julie C.
Cooper Reid F.
McCarthy Carolyn Cordwell
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