Elasticity, Yielding and Episodicity in Simple Models of Mantle Convection

Muhlhaus, Hans-Bernd, Davies, Matt and Moresi, Louis (2004) Elasticity, Yielding and Episodicity in Simple Models of Mantle Convection.

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Title Elasticity, Yielding and Episodicity in Simple Models of Mantle Convection
Abstract/Summary We explore the implications of refinements in the mechanical description of planetary constituents on the convection modes predicted by finite element simulations. The refinements consist in the inclusion of incremental elasticity, plasticity (yielding) and multiple simultaneous creep mechanisms in addition to the usual visco-plastic models employed in the context of unified plate-mantle models. The main emphasis of this paper rests on the constitutive and computational formulation of the model. We apply a consistent incremental formulation of the non-linear governing equations avoiding the computationally expensive iterations that are otherwise necessary to handle the onset of plastic yield. In connection with episodic convection simulations, we point out the strong dependency of the results on the choice of the initial temperature distribution. Our results also indicate that the inclusion of elasticity in the constitutive relationships lowers the mechanical energy associated with subduction events.
Keyword mantle convection
constitutive formulation
plastic yielding
Date 2004-08-01
Subjects 240502 Fluid Physics
280499 Computation Theory and Mathematics not elsewhere classified
269999 Earth Sciences not elsewhere classified
260108 Geotectonics
280406 Mathematical Software
260299 Geophysics not elsewhere classified
260107 Structural Geology
Author Muhlhaus, Hans-Bernd
Davies, Matt
Moresi, Louis
Open Access Status Other
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Additional Notes Article submitted to Pure and Applied Geophysics.

Document type: Preprint
Collection: Earth Systems Science Computational Centre Publications
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Created: Fri, 07 Oct 2005, 10:00:00 EST by Matt Davies