Elasticity, yielding and episodicity in simple models of mantle convection

Muhlhaus, Hans-Bernd, Davies, Matt and Moresi, Louis (2006). Elasticity, yielding and episodicity in simple models of mantle convection. In: X. C. Yin, P. Mora, A. Donnellan and M. Matsu'ura 4th ACES Workshop 2004, Beijing, China, (2031-2047). 9-14 July 2004.


Author Muhlhaus, Hans-Bernd
Davies, Matt
Moresi, Louis
Title of paper Elasticity, yielding and episodicity in simple models of mantle convection
Conference Paper Type Fully Published Paper
Conference name 4th ACES Workshop 2004
DOI 10.1007/s00024-006-0111-5
Conference location Beijing, China
Conference dates 9-14 July 2004
Journal name Pure and Applied Geophysics  (ERA 2012 Listed)    (ERA 2010 Rank C)   Check publisher's open access policy
Editor X. C. Yin
P. Mora
A. Donnellan
M. Matsu'ura
Place published Basel, Switzerland
Publisher Birkhauser-Verlag
Publication date 2006
Volume number 163
Issue number 9
ISBN 978-3764379919; 9783764379926
ISSN 0033-4553; 1420-9136
Start page 2031
End page 2047
Total pages 17
Language eng
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
Elasticity
Plastic yielding
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 11:00:09 EST