GRAVITY stage is used to simulate the deformation of blank under gravity load. The setup is similar to normal sheet forming process simulation. Refer to Section 8.2.4 Forming for description about basic parameters, blank define, tool define, etc. included in Gravity function. In multiple stages analysis, the gravity load can be added to any stage.
This function includes Constraints and Initial conditions. Refer to Section 8.2.4 Forming for definition of Boundary Condition. The interface of Boundary Condition is illustrated in Figure 8.2.99.
Figure 8.2.99 Boundary condition interface
INITIAL VELOCITY OF BLANK: Define the initial velocity of blank.
The interface of Process definition page is illustrated in Figure 8.2.100. In Process definition page, at least one tool is set as STATIONARY.
Figure 8.2.100 Process definition page
TOOL CONTROL: Set tool to be Stationary or Non-active.
SHOW ALL: Show all the defined tools.
GUIDE PINS: Add or create GUIDE and/or PIN, and create a new part for the GUIDE as current tool. Default name of new GUIDE is ACC0000, ACC0001, etc.. For detailed description of GUIDE and PIN, refer to Section 10.6.
In Control definition page, the user is allowed to set up basic parameters to control gravity simulation such as General and Analysis method. There are three methods provided here to solve the gravity load: Explicit (Dynamic relaxation), Implicit (Dynamic) and Implicit (Static). It is recommended to use the Implicit (Static) method. Control definition page is illustrated in Figure 8.2.101.
Figure 8.2.101 Control definition page
TERMINATION TIME (ENDTIM): Termination time.
ADVANCED…: Advanced setup of basic parameters. The dialog box is illustrated in Figure 8.2.102.
Figure 8.2.102 Basic parameter advanced setup interface
ANALYSIS METHOD:
EXPLICIT (DYNAMIC RELAXATION)
IMPLICIT (DYNAMIC)
IMPLICIT (STATIC)
Once the Explicit (Dynamic relaxation) method is selected, the user can click ADVANCED button to set the advanced parameters for dynamic relaxation. The interface is illustrated in Figure 8.2.103.
Figure 8.2.103 Dynamic relaxation parameter
Once the Implicit (Dynamic) method is selected, the user can click ADVANCED button to set the advanced parameters for it, as illustrated in Figure 8.2.104.
Figure 8.2.104 Implicit parameters