D,<n1>,<n2>,[<inc>],[<val>],<labe1>,[<label2>,…<label6>]

where <label i> can be UX, UY, UZ, DISP, ROTX, ROTY, ROTZ, ROT, or ALL

defines the boundary conditions for the nodes between <n1> and <n2> with step <inc>, <val>=0 for free DOF ,<val>=1 for fixed DOF, and <val> = 2 for DOF controlled by another node (rigid body). This instruction is used to generate the kinematic boundary conditions after the nodes have been previously defined. This fact allows a greater flexibility for the node generation procedure. The default values are: 0 for <val> and 1 for <inc>.

Note: Concentrated masses (MT and MR Commands), forces (F Command), or moments forces (MM Command) may be applied at the free degrees of freedom. A fixed degree of freedom does not allow the node to translate or rotate in that direction. Any concentrated masses or forces assigned to this degree of freedom are ignored by ACS SASSI PREP and Submodeler.

Removing unwanted degrees of freedom has the advantage of reducing the size of the set of equations that must be solved. The following table lists the degrees of freedom that are defined for each element type. (GROUP Command)