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. doi:10.1007/s00024-006-0111-5


Author Muhlhaus, Hans-Bernd
Davies, Matt
Moresi, Louis
Title of paper Elasticity, yielding and episodicity in simple models of mantle convection
Conference name 4th ACES Workshop 2004
Conference location Beijing, China
Conference dates 9-14 July 2004
Journal name Pure and Applied Geophysics   Check publisher's open access policy
Place of Publication Basel, Switzerland
Publisher Birkhauser-Verlag
Publication Year 2006
Sub-type Fully published paper
DOI 10.1007/s00024-006-0111-5
ISBN 978-3764379919
9783764379926
ISSN 0033-4553
1420-9136
Editor X. C. Yin
P. Mora
A. Donnellan
M. Matsu'ura
Volume 163
Issue 9
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