Learning Forum

[Jacob Ellis]

I see that Body Interaction in Workbench LS-DYNA creates a *CONTACT_AUTOMATIC_SINGLE_SURFACE card in the input file.

The card created via Workbench:

is very different than the description of the card in LS-PrePost

What is the difference here?

[Armin Abedini]

Hi Jacob,

The first three cards (or rows of variables shown in your picture) are mandatory while the two additional cards (at the bottom of your picture) are optional and enable more control of some contact parameters. Please refer to the LS-DYNA keyword manual for detailed description of each variable.

[Andreas Koutras]

Hello Jacob,

You can use LS-PrePost to open the input .k file generated by Workbench. Then you can refer to the Keyword Manual Vol I (https://lsdyna.ansys.com/manuals/), as Armin suggested, for the definitions of the various *CONTACT parameters. The default contact SOFT option used in Workbench is SOFT=2, which is a segment-to-segment contact, while the default option in LS-DYNA is SOFT=0, which is a node-to-segment contact. In LSPP, to add optional cards for *CONTACT, please check the A, AB, ABC, etc. boxes.

 

[Jacob Ellis]

Armin and Andreas, thank you for your help. My confusion was actually that the labels SSID, MSID, etc in the comments output by Workbench LS-DYNA have been changed to SURFA, SURFB, etc in LS-PrePost. It's clear to me now.