topic Re: Problems with Singularities; New to Simulate in 3D Part & Assembly Design

Problems with Singularities; New to Simulate

MarkEvans — Sat, 12 Dec 2020 17:49:53 GMT

All,I am new to the world of FE analysis and I am trying to teach myself how to use Creo Simulate (aka Mechanica) so that I can begin to perform meaningful analysis on various parts/assemblies that I will be designing. With that being said, I am hoping you might be able to help me

Re: Problems with Singularities; New to Simulate

DenisJaunin — Sat, 04 Jan 2014 15:25:02 GMT

Hello, Mark,

I tried your file, but it does not work.

I did not understand what to serve your two blue line below the room.

These two features can not beings used to place constraints.

In your file is missing constraint to 40 inches.

Any questions, just for all, please always do you use English measures?, Maybe this is the Imperial system

Cordially.

Denis

Re: Problems with Singularities; New to Simulate

cwenner — Sun, 05 Jan 2014 22:41:38 GMT

Bummer. Just did a long post... but it didn't "take". Here's a truncated version.

Poisson's ratio wants to expand or contract the cross-section at your fixed constraint... but the fixed constraint won't let it. Your results are pretty accurate if the beam end is welded to a metal structure (less compliance in the "wall").

Plotting stresses along curves in your 3D model are accurate once you get away from the "local affect" of that constraint.

The nature of the math used for beam elements (a curve) is such that you'd match the closed form answers exactly. You can still plot graphs of the stress along the length of the curve for any recover point of interest (you can define up to 8 recovery points for a cross-section if you define your own cross-section).

Cheers.

Re: Problems with Singularities; New to Simulate

MarkEvans — Tue, 07 Jan 2014 16:34:21 GMT

Hi Chauncey,

Thanks for the reply. What you've explained definitely makes sense.

In the ideal case, I'd like to not have to constrain in all 3 directions at the left constraint. However, if I try to do this I encounter a failure stating that the model is insufficiently constrained.

I was hoping that by including an 'isolate for exclusion' AutoGEM control' I could get Mechanica/Simulate to forget about this area and report stress maximums at the area of peak moment but I didn't have any luck with this. I think the moral of this story is that using the beam tool would likely be the best way to analyze this particular probelm. Thanks again for the help.