Boundary conditions can either be defined on the grid or on the parts (material points). The grid represents the user defined space in which the parts are allowed to move. Similar selection techniques to the one for loading conditions are used. There are no restrictions on the geometrical complexity of the boundary conditions.
Defining Boundary Conditions on Parts (Material Points)
Step 1: Select the relevant material points using the Selection Tools. Alternatively, to set whole parts as boundary conditions, select parts from the model tree.Click 'New', 'Add' or ‘Remove'.
Step 2: Click on the ‘Assign boundary conditions to selected particles’ tool.
Step 3: Choose whether to apply boundary conditions to ‘Selected Particles’, ‘Selected Parts’ or ‘Grid’ (nearest grid nodes to selected particles) as appropriate.
Step 4: Click OK.
Note that when defining boundary conditions on material points motion is restrained in all directions.Defining a whole part(s) as a boundary condition effectively turns it into a rigid immovable object.
Defining Boundary Conditions on Grid Nodes
Step 1: Click on the ‘Select Plane (Grid Nodes)’ tool.
Step 2 (optional): Displace the assembly within the grid by specify x,y and z displacements.
Step 3 (optional): Tick ‘Exclude’ to exclude grid nodes lying inside the CAD parts.
Step 4: Select a plane by using the X,Y or Z slider. Alternatively a plane location can be specified using the 'Key in values of x,y and z' tool in the top toolbar.
Step 5 (optional): Use 2D selection tools to sub-select nodes on the selected plane. Click ok to proceed to 7.
Step 6: Click ‘New’.
Note that defining grid node boundary conditions near a CAD part will apply those boundary conditions to any material points within that cell even if the CAD part is not in direct contact with those grid nodes.
Step 7: Select directions to restrain.
Step 8: (optional) Fill in ‘Depth Limits’ to replicate the 2D selection along the depth.
Step 9: Click ok.