[CIG-SHORT] static friction and cohesion on fault (2D)

[Brad Aagaard]

Bobby,

If your shear tractions do not agree with your friction parameters, then 
it suggests your problem is not setup correctly. If your normal 
tractions are zero, then the fault is opening and the tractions will go 
to zero. You may want to try using a prescribed slip of zero 
(FaultCohesiveKin) to force zero slip and see if the deformation makes 
sense. This will also allow you to monitor the tractions on the fault 
with zero slip.

The quadrature types FIATLagrange and FIATSimplex must match the cell 
type of the mesh. FIATSimplex is for triangular cells.

Regards,
Brad


On 11/12/12 2:37 PM, BOK10 at pitt.edu wrote:
> So, I plotted the traction time histories on the fault, and i'm getting
> similar slip rates and tractions no matter what the friction coefficient.
> I'm looking at the length of time it takes to get to >1cm/yr slip on 75%
> of the fault, and every result is the same. Is there something else that
> could be causing this? I've toyed between FIATLagrange and FIATSimplex and
> settled on the latter one based on the fact I'm using a tri-mesh model in
> 2-D.
>
> Bobby
>
>
>> Bobby,
>>
>> I suggest plotting the traction time histories on the fault. You should
>> behavior consistent with the fault constitutive model and parameters you
>> are choosing.
>>
>> Regards,
>> Brad
>>
>>
>> On 11/8/12 5:09 PM, BOK10 at pitt.edu wrote:
>>> I have a 2D model with a fault that I have static friction and cohesion
>>> on, but no matter what friction (0-1) or cohesion (0-200 kpa) estimates
>>> I
>>> pick, the slip rates along the fault are identical and occur in the same
>>> exact time-step. I am pushing the blocks past one another by applying
>>> velocity boundary conditions. I didn't have this problem before until I
>>> changed the geometry of my faults slightly. Is there something else that
>>> could be causing this?
>>>
>>> Bobby
>>>
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>>
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