NX10 Design Simulation Displacemnt Results and Collision

[NXerGeneration]

Hello,

In my quest to learn NX10 Design Simulation, I have run into the following situation.

I'm not sure how to set the Deformation representation to show the true Displacement result. Is Scale of 1.00 for % Model the proper setting?

Also based on the attached, its a simple load case where forces are applied to simulate a clamping condition, there is small gap between the Yellow and Blue component, however in its Displacement solution, there seems to be collision between the two, this brings me to my initial Deformation representation question or is something else set up incorrectly?

See links to the attached images

https://files.engineering.com/getfi...b330-60deb9bcc18b&file=Deformation_Window.JPG

https://files.engineering.com/getfi...1b1-50150103387a&file=Design_Simulation_a.JPG

https://files.engineering.com/getfi...7d3-b5ba77a16b51&file=Design_Simulation_b.JPG

https://files.engineering.com/getfi...1115e3912&file=Design_Simulation_animated.gif

 

[NXerGeneration]

Hello, is there any one willing to help me out with this one?

 

[FEA way]

To see the real deformation you should set scale=1. Significant penetrations shouldn’t be visible in this case (they are fine when the scale is > 1 though). If you get large penetrations for unit scale then the contact definition needs to be checked.

 

[NXerGeneration]

OK thanks for helping me understand the real deformation, So in this case there is a definite penetration (see attached animation),

I'm not sure where I went wrong on the contact definition.

Face Gluing is applied between the bottom of the blue plate and the top of the small yellow cylinder, (see attached pic)

No mesh mating is applied in the .fem though.

https://files.engineering.com/getfi...82-8006-f07eaed13841&file=Face_Glueing(2).JPG

https://files.engineering.com/getfi...c-4beb-912c-151547fb2b77&file=penetration.gif

 

[FEA way]

I think that the face gluing doesn't work because of the initial gap between the faces. Theoretically you could increase the search tolerance but I wouldn't recommend it in this case. Instead you should use nonlinear contact.

 

[NXerGeneration]

Under Mesh Mating Condition I have the following three options:
Glue-Coincident
Glue Non-Coincident
Free Coincident

Under The Simulation Object Type two options:
Surface-to-Surface Contact
Surface-to-Surface Gluing

Do you mean Glue Non-Coincident?

 

[NXerGeneration]

I looked at all the contact definitions and none seem to close the gap with considerable penetration or keeping the gap unaffected.

Could this be limited by the fact that this is being done under the Basic Design Simulation not the Advanced???

 

[FEA way]

For this case you should use nonlinear static analysis which offers nonlinear (changing) contact interactions. This way you will be able to account for contact established during the analysis.

 

[NXerGeneration]

It seems nonlinear static analysis is not available under the Basic Design Simulation. Cab you take a look at the image and confirm that his is in fact the case.

 

[FEA way]

Yes, it's definitely not there. You would have to change the solver from "NX Nastran Design" to "NX Nastran".