[CIG-SHORT] [EXTERNAL] A question on plastic material in Pylith

[Brad Aagaard]

Bing,

examples/3d/hex8/step09.cfg is intended as an example showing the model 
setup for the Drucker-Prager material. You are correct that there is no 
plastic deformation in this case. See Aagaard, Knepley, and Williams 
(2013) for discussion of the SCEC Dynamic Rupture benchmark TPV13, which 
includes plastic deformation.

Aagaard, B. T., M. G. Knepley, and C. A. Williams (2013), A domain 
decomposition approach to implementing fault slip in finite-element 
models of quasi-static and dynamic crustal deformation, Journal of 
Geophysical Research: Solid Earth, 118, 3059–3079, doi: 10.1002/jgrb.50217.

For questions related to PyLith, please use the 
cig-short at geodynamics.org mailing list.

Regards,
Brad


On 7/2/18 9:07 AM, Bing He wrote:
> Dear Dr. Aaggard,
> 
> I am Bing He, a graduate student at the University of Rhode Island, 
> working with Prof. Matt Wei. I use Pylith to study the dynamic rupture 
> process and quasi-static problems. Thanks for developing such a powerful 
> tool!
> Now, I'm trying to study the effects of ground deformation from plastic 
> upper crust material. I have a question about the plastic material in 
> example Step 09.cfg. I do not know why all the plastic strains are shown 
> zero. It seems that there is no plastic effect in the results. Is that 
> due to the setting of plastic parameters or the elastic strain is too 
> small to reach the plastic threshold? I can not find more examples and 
> explanations about plastic material in Pylith manuals. Could you please 
> help me with this question and explain how does the plasticity module 
> work in Pylith?
> Many thanks for your time and have a nice day!
> 
> Sincerely,
> Bing
>