Periodic boundary condition (PBC) for solid porous material

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What Comsol options should I use to properly define periodic boundary conditions (PBCs) for solids with uniformly distributed cylindrical holes? Unit cell is presented in: (unit-cell-1, unit-cell-3)

Some Comsol helps does not help to solve the problem of compressing / stretching the unit cell.

Example 1.

https://www.comsol.com/support/learning-center/article/80311

Applied load in one direction does not influence other sizes of unit cell. Why?

Example 2.

https://www.comsol.com/blogs/analyzing-a-unique-poroelastic-metamaterial-with-simulation

In second example deformed unit cell is still cubic box.

Sometimes it is not possible. See attached figure unit-cell-4.

How to make boundaries deformed after PBC will be applied with loads?



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