Bbar Implementation

[ezrayst]

Describe the feature Bbar to separate volumetric and deviatoric computations, prevent locking for problems like undrained total stress analysis.

If no one else wants to do it, I could do it. I have done something before but this is not updated to the current develop branch: https://github.com/ezrayst/mpm/tree/bbar

[kks32]

I think the issue was how do we switch between doing bbar and not doing bbar without having to execute an if condition in every loop

[ezrayst]

Would another class that contains compute_strain_rate from velocity be helpful in this case? We might in the future implement enhanced strain or mixed method which would require some modifications to B matrix. So instead of if statements, we have a class maybe called B-strain or something

[kks32]

@ezrayst Could you share an implementation detail of how this might work, I don't understand how a separate class for compute_strain_rate would work.

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