ANALYSIS (CTRL+A)

The ANALYSIS menu allows the user to set the parameters for running a stamping simulation, gravity loading and springback analysis. The parameters will be written into the analysis output. The default dialog window of this menu (for stamping simulation) is shown in Figure 13.1.1.

 

(a) (b)

Figure 13.1.1 Analysis dialog window (a) LS-DYNA Input (b) Full Run DYNA

ANALYSIS TYPE

There are two types of analysis output:

LS-DYNA INPUT FILE

This function outputs analysis results as an LS-DYNA input deck.

FULL RUN DYNA

This function outputs an LS-DYNA input deck and submits it to LS-DYNA, which will be running in the background.

The user can select the type of analysis output by clicking on the toggle menu.

CONTROL PARAMETERS

This function allows the user to define the values of control parameters for running a stamping simulation using LS-DYNA. The user can edit the parameters by clicking on the CONTROL PARAMETERS icon from the ANALYSIS dialog window. The DYNA3D CONTROL PARAMETER dialog window is shown in Figure 13.1.2.

Figure 13.1.2 Control Parameters dialog window

OK - Accepts the control parameters

DEFAULT - Resets all values to their default settings

RESET - Resets the last defined setting to its previously defined value

ADVANCED - Extends the table to make the advanced control parameters show up

CANCEL - Aborts the tableand resets all values to their previous setting

Note: Refer to the LS-DYNA User's Manual for detailed information about each control parameter.

GRAVITY LOAD (toggle)

This function toggles gravity force ON/OFF and writes out the relative control cards to the input deck.

DYNA OUTPUT (DYNAIN) (toggle)

This function automatically writes out the INTERFACE_SPRINGBACK_DYNA3D card to the input deck. Therefore, LS-DYNA will create a DYNAIN file at the end of the simulation run. The DYNAIN file contains the deformed blank results, including thickness, stress and strain.

SPRINGBACK (SEAMLESS)

This function toggles on/off the LS-DYNA seamless explicit/implicit switch. It will activate implicit springback analysis after the stamping simulation. If SEAMLESS is toggled on, user can set the springback constraint and define the IMPLICIT parameters as shown in Figure 13.1.3.

Figure 13.1.3 Implicit Parameters

Note: Refer to the LS-DYNA User's Manual, keyword *CONTROL_IMPLICIT_OPTIONAL, for more information.

ADAPTIVE MESH (toggle)

If this function is toggled on, ADAPTIVE scheme is activated during the stamping simulation. The user can edit the adaptive parameters by clicking on the ADAPTIVE PARAMETERS button. The default ADAPTIVE CONTROL PARAMETERS dialog window is shown in Figure 13.1.4. The ADVANCE button enables the user to expand the dialog window for more adaptive parameters.

Note: Refer to the LS-DYNA User's Manual, keyword *CONTROL_ADAPTIVE, for detailed information about each parameter.

Figure 13.1.4 The Adaptive Control Parameters dialog window

DEFINED TOOLS ONLY (toggle)

If toggled ON, only parts defined as tools will be output to the input deck. If toggled OFF, all parts in the eta/DYNAFORM database will be output.

SPECIFY MEMORY (toggle)

If toggled ON, the user can allocate memory (in Mb) for running LS-DYNA. This function will automatically convert the input memory (in Mb) to memory (in words) and write it out to the *KEYWORD card in the input deck.

The FILE NAME must be given. If the file name is not known, the button alongside the FILE NAME FIELD displays a selection dialog window from which the user can select the file name.

The TITLE must be given. TERMINATE TIME is given automatically by the program according to the motion curve.

After the above requirements are defined, select OK to start the process.