Learning Forum

[l.su-1]

Hi everyone,

In my simulation, I have a series of unconnected body, specifically an array of sleepers. I create them in the design modeller and grouped all bodies into a part. For this part, I assign them a single material property. However, when I write the .k keyword for ls-dyna in ansys mechanical, it always generate a part, a section, a material for EACH body, though all the part/section/material is the same. That means I have dozens of part in ls-dyna input file, which is very inconvenient. I attached the screenshot of ansys mechanical and ls-prepost in the following. 

Does anyone know with many disconnected body, how can you group them into one part in the ansys environment and subsequently write corresponding desired .k input file? Thank you!

 

[igandiko]

Hopefully someone will chime in to combine the parts in Ansys environment. Since you have access to LSPP, you can move the elements of all parts to one part using the below options. 

[l.su-1]

 I was aware of this solution and have tried it before. While it’s almost perfect, there will be dozens of unused section and material cards in the LS-DYNA input file, which complicates things a bit. Still, I really appreciate your reply, at least now I know there might not be an obvious way to achieve this in ANSYS enviroment that I might have missed.

[igandiko]

I think the easiest way to remove those extra section and materials cards is through a text editor. Just edit the .k file and remove the cards. 

Another option: go to keyword manager > model check > double click on section/mat cards > delete all unreferenced cards. 

[philippe33]

When working with unconnected blocks in Ansys Mechanical, you may have difficulty grouping them into a single part when exporting the .k input file to LS-DYNA. To solve this problem, use the grouping feature in Ansys to create a single part for all the blocks. If necessary, write a script to adjust the input automatically. Good luck, and while you're down, try playing some io games to relax!