Erik’s advice is the way to accomplish exactly what you want, but using coupling is sometimes confusing.
An approximate method to achieve what you want is to use a Remote Displacement (Behavior = Deformable) on the face, and set Rotation about X and Y to be 0, but leave the Displacement in X, Y and Z Free. This will make the nodes stay on average in the same Z plane. If you use a Constraint Equation, then the nodes will stay exacly in the same Z plane.
Below is a force applied to the top of the small area without a Remote Displacement.
Below is the displacement with the Remote Displacement.
Please Login to Report Topic
Please Login to Share Feed
New Post - Reply To: Restrict nodes in a face to the same deformation in 1 direction