topic Re: how to add initial strain in Inventor Nastran Forum

how to add initial strain

tykryu — Sun, 19 Apr 2020 23:09:58 GMT

In Inventor nastran 2020, I want to analyze pre-strained (initial strain) polystyrene panel bending with heating.

I found that I have to input initial strain to bulk data(PSTRAIN or INITSTRAIN ?) , but I dont know how to input it.

Please give me the answer.

OS: Windows10

Use software: Autodesk Inventor professional 2020.

Re: how to add initial strain

johnsonshiue — Tue, 21 Apr 2020 00:43:35 GMT

Hi! Inventor FEA can only do static analysis on isotropic material. It cannot handle heat stress and non-linear deformation. I believe you need to use Inventor NASTRAN instead.

Many thanks!

Re: how to add initial strain

tykryu — Tue, 21 Apr 2020 07:48:05 GMT

Oh, I'm sorry, I forgot to write explicitly the software I use.

I installed Inventor nastran already, thanks your confirmation.

Re: how to add initial strain

johnsonshiue — Tue, 21 Apr 2020 20:30:14 GMT

Hi! Then I will move this thread to Inventor NASTRAN forum.

Many thanks!

Re: how to add initial strain

KubliJ — Wed, 22 Apr 2020 20:17:54 GMT

Hi @tykryu

It is possible to add initial strain to a Nastran analysis. But it will need to be manually added to the deck file.

INITSTRAIN needs to be added to the case control to identify/call the card STRAIN.

With the data looking like: