[Geoqus] Winkler buoyancy forces

[Gabriele Morra]

Hi Jack,
  we implemented it in a couple of papers on subduction. Using a  
dload subroutine one can apply an Archimede restoring force at the  
bottom of the lithospheric plate. If your model gets unstable, you  
also apply it as a body force. The only thing you need to calculate a  
priory is the isostatic equilibrium depth. Given that the winkler  
foundation is linear with depth, it straightforward to implement it  
using the "coords" variable of the subroutine. In order to model  
subduction we then switched off at a certain depth (6-15km), and it  
worked properly.

Gabriele

Gabriele Morra
Geophysics Institute
ETH Zürich, CH

> Dear Abaqus users,
>   Can anyone provide insight into using ABAQUS to model Winkler
> restoring forces, or any technique to prescribe isostatic boundary
> conditions to the base of a gravitationally loaded body?  I could make
> the plate very long in the depth dimension and then restrict vertical
> displacement on its lower boundary, but I am interested in modeling a
> finite-thickness plate where bending stresses may be important.
>   Many thanks in advance,
>   Jack
>
> Jack Loveless
> Department of Earth and Atmospheric Sciences
> Cornell University
> 3147 Snee Hall
> Ithaca, NY 14853-1504
> (607) 255.9404
>   jploveless at gmail.com
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