Wave linked faces

[AswinSchouten]

Greetings everyone,

I'm going to start with a simplified version of my problem.
I have 2 cubes and a cylinder connecting the two cubes. I am now going to displace and rotate one of the cubes a little bit and i want the connecting cylinder to deform/bend with it. Now that the cylinder is deformed/bend I want to know the stress concentrations in the cylinder.

The attached pictures are related to the discription above.

I have been told that I could make two arrangements one for each scenario and then somehow wave link the cylinder. this way the cylinder would adapt itself to the parts it's linked to. if this is the way to go could someone please explain to me how this can be done, I really can't find anything on the internet that is understandable for a beginner like me.

 

[JohnRBaker]

If you're expecting that 'cylinder' to somehow automatically deform based on the fact that the face at one end has rotated, you're going to have to create something other than a normal 'cylinder' feature. And even if you do use something like sweep a circle along a path (that's the approach I would use), this would only give you an idealized case which would not act like the actual true physical behavior of some part deforming due to a force/deformation applied to a part of it. For that, you will need to use Finite Element techniques, which NX can provide you and where you can start with a simple model and then apply constraints and loads, define the material used to manufacture the model, etc. but that does require special licenses for the CAE modules.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
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[AswinSchouten]

Hi John,

The pictures I attached to the original post was to illustrate what I would like to achieve, not how I would achieved it. I am new to this program so forgive for asking what might be stupid questions.

Back to the point. I have worked on some basic exercises at school where we would have to mesh, assign materials, apply constaints and force, ... and simulate this. But now I am facing this problem where I am not to apply a force but a translation/rotation of one part which would induce stressconcentrations in other parts.

The example with the cubes is somewhat analog to what I am suppose to do so if I had the answer to that I could maybe apply the same method on my exercise.

If you are interested I could post the whole problem and maybe you could give me some guidelines as to how you would approach the problem.

Note that I am not trying to cut corners by letting someone else solve my problems for me. I spent a lot of time googling and experimenting in search of an answer. this forumpost serves as a last resort.

 

[JohnRBaker]

Our Analysis software allows you to use 'displacements' as well as 'forces' to define how a part will be deformed.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

[AswinSchouten]

Ok, that's probably very helpful, thank you John.

I am going to add another problem to the subject now. If we look at the cube example and we are given a model of the cube that is fixed, a model of the cube that has not been displaced and a model of the cube that has been displaced. how would you be able to get the undisplaced cube in the exact position of the displaced cube?

I know this might be a bit early to ask since I haven't tried the 'displacement' option yet, but I don't want to risk the thread going dead and not getting a response at all.

 

[JohnRBaker]

No, you create the as designed model and then when you add the constraints and loads, or in this case assign a displacement I believe it's done by indicating a pair of coordinate systems and the resultant file will show the actual deformed model. Note that I'm not a CAE expert but have seen demos and I thought that was how it was explained to me. Perhaps someone with actual NX CAE experience can contribute some thoughts here.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

 

[AswinSchouten]

I'm in the simulation, where I can apply loads and constraints but I'm not finding the 'displacement' option, what am I missing?

I am on NX 8.0 btw.

 

[Toost]

Have you tried the command finder ?
Help - Command finder , type "Displacement" and search.
Should open up the dialog for you.

Regards,
Tomas