[aspect-devel] Visco_plastic material model

[John Naliboff]

Hi Mohamed,

The deformation regime (plastic vs viscous) is determined by the yield strength criterion (Drucker Prager).  

I indeed set the cohesion to a very large (1e20 Pa) value so that the material in this simple test model is always in the viscous regime.

Cheers,
John

*************************************************
Assistant Project Scientist, CIG
Earth & Planetary Sciences Dept., UC Davis





> On Jun 13, 2016, at 11:52 AM, Mohamed Gouiza <M.Gouiza at leeds.ac.uk> wrote:
> 
> Hi John,
> 
> I looked at the the visco_plastic.prm file and I have a question: 
> How do you define which compositional fields are in the plastic domain and which are in the viscous?
> Only by their cohesions?
> 
> Mohamed
> 
> 
>> On Jun 13, 2016, at 6:16 PM, John Naliboff <jbnaliboff at ucdavis.edu <mailto:jbnaliboff at ucdavis.edu>> wrote:
>> 
>> Hi Mohamed,
>> 
>> There is a ‘test’ input file (visco_plastic.prm) for the visco plastic material model in the development version of Aspect.   The test files are located in the ‘tests’ folder.    
>> 
>> Take a look at that and let me know if you have any questions.  I think that should be a reasonable starting point for building a new model.   
>> 
>> I’m working on additional examples with strain weakening at the moment, which should be available at the end of June.
>> 
>> Cheers,
>> John
>> 
>> *************************************************
>> Assistant Project Scientist, CIG
>> Earth & Planetary Sciences Dept., UC Davis
>> 
>> 
>> 
>> 
>> 
>>> On Jun 13, 2016, at 8:41 AM, Mohamed Gouiza <M.Gouiza at leeds.ac.uk <mailto:M.Gouiza at leeds.ac.uk>> wrote:
>>> 
>>> Hi John, <>
>>>  
>>> Could you please share a parameter file where a visco_plastic material model is used.
>>> Finally I have time to run visco_plastic models and I need a template to see how to setup the various parameters.
>>>  
>>> Thank you.
>>>  
>>> ------------------------------------------------- 
>>> Mohamed Gouiza, Research Fellow
>>> Basin Structure Group, Institute of Applied Geosciences 
>>> University of Leeds, School of Earth and Environment
>>> Leeds,  LS2 9JT, UK
>>> M.Gouiza at leeds.ac.uk <mailto:M.Gouiza at leeds.ac.uk>
>>> +44 7985 782073
>>> -------------------------------------------------
>>>  
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