topic Re: Stress analysis on derived part: no contacts on referece body warning messag in Inventor Forum

Stress analysis on derived part: no contacts on referece body warning message

Anonymous — Wed, 28 Jan 2015 22:25:24 GMT

I am running a stress analysis on a derived part. I created the part using another part file and used the option to maintain each solid as a solid body. After referencing the geometry I needed, I turned off the visibility of the source part. Now when I try to run a stress analysis on the derived part, I get a warning saying that there is no contacts attached to the body of the of reference part. That body is not supposed to be included in the simulation. As far as I can tell, Inventor is not performing an FEA on the referecene part, but I cannot be sure. Does anyone know if Inventor is actually including the reference body of my derived part in the simulation? If it is, what is the best method to make it so that it is not included in the simulation?

Re: Stress analysis on derived part: no contacts on referece body warning messag

blair — Thu, 29 Jan 2015 00:18:43 GMT

I've never run into this, create a new IPT or IAM, derive to a IPT, open the derived IPT and run FEA on it and get an error referencing the Parent. Make sure that you are current on all SP's and Updates for your product.

Use the "Close All Files" within Inventor and then open the derived IPT and try the FEA again.

Re: Stress analysis on derived part: no contacts on referece body warning messag

Anonymous — Fri, 30 Jan 2015 15:21:05 GMT

Turning off visibility of parts will not exclude them from the simulation. You need to "Exclude from Simulation" the parts in the stress analysis environment.

Re: Stress analysis on derived part: no contacts on referece body warning messag

Anonymous — Fri, 30 Jan 2015 15:46:43 GMT

I am aware that it is necessary to use the "exclude from simulation command" to exclude parts from a simulation. However you cannot use that option on individual bodies of a multi-body part.

Re: Stress analysis on derived part: no contacts on referece body warning messag

Anonymous — Fri, 30 Jan 2015 15:56:47 GMT

Your initial post is slightly confusing then:

"After referencing the geometry I needed, I turned off the visibility of the source part."

Re: Stress analysis on derived part: no contacts on referece body warning messag

JDMather — Fri, 30 Jan 2015 15:59:25 GMT

@Anonymous wrote:

... However you cannot use that option on individual bodies of a multi-body part.

Then use Derived Components to isolate each of your solid bodies for analysis.

Attach file(s) here if you can't figure it out.

Re: Stress analysis on derived part: no contacts on referece body warning messag

Anonymous — Fri, 30 Jan 2015 16:30:17 GMT

Not sure what you are saying. I have attached my two parts. The column bracket is derived from Part36. The issue is Inventor is giving me a warning that there no contacts attached to the reference (Part36) body, which makes me think it is included in the simulation. However I just looked at the mesh view and Inventor does not appear to be generating a mesh for the reference body. So I would guess it is not actually being included in the simulation.

Re: Stress analysis on derived part: no contacts on referece body warning messag

JDMather — Fri, 30 Jan 2015 16:46:08 GMT

Your logic doesn't make sense to me?

You have one solid body derived into a second solid body.

If you want to do the analysis as an assembly - then use an assembly file.

If you want to do the analysis of both as one body - then Combine.

If you want to do analysis of one or the other - then do it on separate files before any derive.

Re: Stress analysis on derived part: no contacts on referece body warning messag

blair — Fri, 30 Jan 2015 16:58:25 GMT

After downloading and looking at your files I am having a really tough time following your methodology for your model. You have a load on one side of the plate with contraints on the other side.

Is this really a single part or are you trying to model an assembly.

Re: Stress analysis on derived part: no contacts on referece body warning messag

Anonymous — Fri, 30 Jan 2015 17:30:00 GMT

You can ignore the loading and constraints in the part. I only put those there to see if it would produce the same warning message again. The analysis I am performing is on assembly which I did not include because it is not part of the issue. My concern is whether or not Solid body 1 (which was derived from Part36) in the bracket part file is affecting the FEA. As I mentioned before, I do not believe it is, and so the warning message that there are no contacts attached to Solid body 1 is meaningless.

Re: Stress analysis on derived part: no contacts on referece body warning messag

blair — Fri, 30 Jan 2015 17:40:00 GMT

Did you compare your results with and without the lower part. Not really sure since you constrain the lower face of the plate and have a load/force applied on the opposite face.