These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.
Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. The reaction force is half that of a full model due to a model having only half the thickness.
One problem with Hex elements is they can develop an Hourglass deformation mode. The following 3 slides show it being initiated.
Here is the link to the ANSYS 2023R1 archive. https://jmp.sh/zMLYOn8J
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