Creo 1.0 Simulate Issue - "Model is insufficiently constrained"

[ptc-4456390]

Hi, I am trying to run a simple stress analysis on an assembly using a static analysis, but I keep getting the error:

"The model is insufficiently constrained for the analysis. Please review the element connections,

properties, and constraints in highlighted entities. If this is a modal analysis, then you may be

able to obtain a solution by requesting additional modes."

Total Assembly:

Latch:

Pin

Error

I have defined:

-materials

-surface-surface contacts

-hole constraint in all directions on latch

-surface constrait on all pin surfaces in all directions, except X (same direction as load)

I tried doing the same analysis on a single part (rather than an assembly) and it works fine.

Does anybody have any ideas how to resolve this issue?

Thanks a lot

Mark M.

[danderson]

Mark,

Is the latch fixed so that it can't move using a displacement constraint?
I'm assuming the pin has some freedom to move. The pin is fixed in what directions using a displacement
constraint?

Thanks,
Don Anderson

[danderson · Accepted solution]

Mark,

Make sure the material files have Denisity, Young's Modulas, and Possions assigned in them.

Don

[ptc-4456390]

and Yes, both parts were assigned steel from the material library and they have those 3 properties.

Thanks

[ptc-4456390]

The latch is constrained in all directions in that hole using a displacement constraint.

The pin in constrained in all directions except X (same direction as load arrows in first picture) using a displacement constraint.

The reason the pin is much more constrained is because the error screen always points to the pin "elements" (as seen on the Error picture), so I tried many different constraints:

-Surfaces---->Individual----->Surface Set (all surfaces on pin)

-Surfaces---->Boundary

-Curves/Edges

-Points

Heres some other views of the error:

Thanks Don.

[danderson]

Mark,

Take a look at the attached file. It might give you some ideas.

http://communities.ptc.com/servlet/JiveServlet/downloadBody/2722-102-1-3146/asm0001.asm.zip

Don

[ptc-4456390]

Thanks but I only have the student version of Creo, not the commercial one so it wont open.

[danderson]

Mark,

Upload your files and I will take a look.

Don

[ptc-4456390]

I figured it out, it was a material property issue. Thanks a lot

[ptc-5891379]

Hi Mark,

Now I also get this kind of problem. Could you kindly tell me the detail about the material property issue.

Thanks a lot.

Raphael

[nilesh128]

Dear Sir,

I made a tank model which is closed all side and applied pressure from inside, during analysis model failed in meshing, while check in review geometry and auto-gem, there is no error, please solve this issue 

i had already check factors Denisity, Young's Modulas, and Possions.