FIXROT,[Stiff],[Mode]

Command to fix rotations of solid rotation and in-plane shell rotations. This command will attempt to fix rotations by using the equivalent of the D command to fix rotations that shouldn't be free. However, shells faces that are not parallel to a dimension of global coordinate system cannot be fixed in this way. Therefore, this command will also add a spring to each node on a shells face that has stiffness parallel to the normal of the shells face. The user can control the stiffness of this spring by the stiff parameter of the command.

• Stiff – Stiffness of springs added to shells to remove the singularities. (default stiffness 100)
• Mode - Determines how to consider shell faces lying on Solids
  • 0 - Rotation fixed only in the direction of the normal. This options is better for embedded models (Default)
  • 1 - Rotation on Shell nodes fixed in all direction. This option is better for surface models