Learning Forum

[aa22meb0a03]

I'm working on an analysis of Baja rollcage, and I want to conduct a crash analysis on workbench ls-dyna (front impact on a rigid wall). I imported the parasolid format of rollcage and performed beam extraction and connection to ensure everything was connected. I then made a closed rectangle to represent the rigid wall. then I updated the geometry and went into mechanical.

but upon meshing, I found that I could not select any geometry to impart velocity to. The geometry drop-down shows only 1 object (it should show two since I made one rectangle, and the beam roll cage is separate). It also shows a question mark, but I can't find any yellow box, so I'm not sure what data is missing.
And when I try to fix the scoping error by trying to find problematic parts, it shows nothing.

Can someone help me out with this?

[Ram Gopisetti]

Hi, 

Try refreshing or reopening the mechanical and see if that fixes this issue. It would be best if you did not use the rigid solid block instead you can use the shell with nominal thickness with rigid behavior something like the *RIGIDWALL feature offered in the LSDYNA. 

Based on image 2, please check if you have defined the right material properties and behaviors corrected. 

Using the velocity boundary is not advisable, use the initial velocity conditions to enforce the velocity to the cage. 

Cheers, Ram