Hi @Jaeyoon - A few additional suggestions to the one @bangerth above, which should work:
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To confirm, do you see still coarsening at the surface away from shear bands if you use
set Coarsening fraction = 0? In that scenario, I think you should just see refinement and no coarsening. -
You can use the parameter
set Minimum refinement level(documentation) to make sure the mesh does not coarsening beyond the set value (this can be the initial grid refinement level). -
To refine based on plastic strain, you can use the composition threshold strategy (example test case, documentation)
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As an aside, if you are refining inside the localized shear zones I strongly suggest using the plastic damper term in the visco plastic material model to provide a quasi length scale for the shear band width. An example model with that uses this term can be found here.
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As a second aside, very cool looking initial results!
Cheers,
John