Learning Forum

[Jérôme RENAULT]

Hello,

Further to my question regarding access to the AWG group pages, I'm getting the input files presenting a possible workflow for obtaining the initial stress state of a rotating engine part (described in § 5.1.1 and § 5.1.2 of the document LS‐DYNA® Aerospace Working Group "Modeling Guidelines Document" version 24.1).

I'm doing the same thing with my model, but I'm unable to obtain a steady state for my rotating part at the end of the second step. The main difference is that my model includes *ELEMENT_SHELL_OFFSET elements. So, I simply modified my input file by replacing the *ELEMENT_SHELL_OFFSET elements with *ELEMENT_SHELL elements, and the behavior seems much better, except for the triangular elements, which still don't reach the steady state.

Two questions at this point:

1. Is it possible to use a prestress analysis following the workflow presented in the AWG document with offset shell elements and enabling additional options ? I need to use shell offset element as I will work with composite parts modelled with ACP.
2. How do I handle the problem with triangular elements? (My part is a cone, which will be difficult to mesh with only quad elements, but not impossible, I admit.)

 

Best regards,

 

Jérôme