The Process page is illustrated in Figure 8.3.103, The gravity load option in Process page enables the user to consider the influence of gravity in springback analysis. This option is not toggled on by default. It will add the tool control option in Process page if the user defines the tool in springback. There are two cases for tool control: Non-active and Stationary.

Figure 8.3.103  Process definition page

CONSTRAINT

The user can select Inertia Relief, Nodal Constraints and Point Constraints when setting springback constraint. Inertial Relief uses rigid body mode to analyze linear static problem.

Inertia Relief

Selecting Inertia Relief to analyze springback, the user can set a threshold value and the default is 0.001Hz.

Nodal Constraints

Allows the user to select three nodes to constrain rigid displacement of blank during springback analysis. The first selected node is constrained in X, Y, Z direction. The second selected node is constrained in Y, Z direction. The third selected node is constrained in Z direction. The relationship of location for these three constraints is illustrated in Figure 8.3.104.

Figure 8.3.104  Springback constraints definition

Point Constraints

The user is allowed to define constraints by selecting point/node. When exporting the constraints information, replace the node number with the point coordinates to avoid the possible error due to the removal of some nodes from element trimming in a previously completed step in multi-step analysis. The method for defining Point constraints is similar to that for Nodal constraint. The Point constraints dialog box is illustrated below.

U – Constrain the translation along U-axis direction.

V – Constrain the translation along V-axis direction.

W – Constrain the translation along W-axis direction.

Figure 8.3.105  Point constraints dialog box

Nodal Forces

The user may apply a force on a node or set of nodes. The setup dialog box for nodal forces is illustrated in the Figure below. In the nodal forces list, FC indicates constant force, and FV indicates force which varies with time.

Figure 8.3.106  Nodal forces

Force: The user is allowed to apply FC or FV on the selected nodes.

Direction: The user is allowed to define the force direction, and the default direction is +W.

New: Selects node to apply nodal force.

Modify: Modifies the force and direction at the selected node.

Delete: Deletes the nodal force of the selected node.

Delete All: Deletes the nodal forces of all the defined nodes.

OK: Accepts the defined nodal force and exit.

Cancel: Does not accept the defined nodal force and exit.