Torsional Rigidity - FEA issues in Creo

[ajeffreys]

Hello,

I'm attempting to analyze the torsional rigidity of my frame in Creo; however, despite my analyses converging, I'm getting obviously incorrect displacements.

The rear is constrained to restrict translation in all directions.

The torsional loads at the front-upper suspension points are set to 130 lbf, acting 9.0125 inches from the CG. This equates to a torque of 195.3 lb-ft.

Now, here's a (rather hilarious) fringe plot of the displacements in the system:

As you can see from the picture, my frame is crumpling up like a soda can, with a maximum displacement of 36 inches, which happens to be the smallest I've achieved so far.

I'm assuming it's constrained improperly, but after attempting several different schemes, I've decided to turn to you folks for some help.

What are your thoughts?

Thank you.

[ajeffreys · Accepted solution]

I found the issue. I had set Young's modulus for AISI 1020 Steel to 29700 psi rather than ksi. Guess I was more tired than I thought, as I checked the material properties a couple of times last night.

Thanks