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Page 2: PTravel (Part Travel)

  • ptravel panel
  • Figure 1 - Part Travel

Purpose: This interface can be used to position the components involved in a forming siumlation (part, die, punch, blank, blank-holder, etc...) so that they are in exact contact at the beginning of the analysis.

Usage: The nodes of the Moving parts will be moved while the Fixed parts acts like a contact surface. Multiple parts can be selected for both Moving parts and Fixed parts. The reference point on the moving parts will be moved as close as possible to the fixed parts in the direction of X, Y, and Z without causing any penetrations. The default reference point is the center coordinate for the nodes of the moving parts.

The moving parts can optionally be allowed to undergo rigid body rotation together with translation. This is activated with the Allow rotation toggle. The rotation point, which is the same as the reference point, can optionally be changed to be at any nodal position by activating the Ref. node toggle and picking a node with the left mouse button or typing a node ID in the text field. The stresses and strains on the *INITIAL_STRESS_SHELL, *INITIAL_STRAIN_SHELL, and *INITIAL_STRESS_SOLID keywords are automatically rotated to follow the rotation of the elements in the moving parts.

The thicknesses of the moving parts will be considered if the T1 toggle is active and the thicknesses of the fixed parts will be considered if the T2 toggle is active. With either of these toggles active, an appropriate gap will be left between the moving and the fixed parts. The purpose for this is to make the parts "exactly in contact" as far as LS-DYNA is concerned. Additional clearance between the moving and the fixed parts can be added by typing a value in the Gap field.

Note also that the direction of travel can be reversed by clicking the Flip Dir. button.


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© 2012 Livermore Software Technology Corporation