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Re: include fluid force with undrained PFV in triax controller

 

Hi (Bruno),

What is the cumulated stiffness of both phases? kn + k_fluid?

The stiffness should reflect the stress-strain relation in uniaxial
undrained deformation.
Should be Young+k_fluid/porosity I think, but it is not required to be
absolutely exact (e.g. assuming porosity=0.3 is good enough).

Sorry, but I still do not get it. What do you mean by Young + k_fluid/poro?
Do you mean Young modulus of the sample (including porosity)? But then we will get a stiffness in N/m^2. TSC needs a stiffness in N/m for calculation of translation.

If so, TSC could automatically search a PFV engine in O.engines, and if
found it would use pfv.bulkModulus to update the stiffness.

I found a way how to do this. Thanks for the hint.


Regards,

Christian



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