Erik Kostson
Ansys Employee
That is not possible with distributed mass (it only takes density - as we use surf154 elements and that is the material property given - MP,,DENS). Thus the only option is to use mass21 if we need mass in only one direction.

Perhaps something that might be of help is to assign the mass21 to a set of nodes in WB mechanical like when we use point mass from the UI and assign to a face (mass will be distributed amongst nodes belonging to that face). Then we can use commands under the point mass object, to change the behaviour of the mass21 element to have only mass in one direction (use RMODIF to change mass).

ALl the best