simulation constraints oring

[Anonymous]

Looking to pressurize a closed end hollow cylinder. Constrained on closed end and approximately 0.5" from open end with and oring. How to place a radial constraint on the oring face at a certain height which extend around the entire diameter?

[todd_alford]

Hi @Anonymous,

I'm not sure if I completely understand what you are trying to do.  But from what I understand it sounds like breaking the interior surface is what you are trying to do.  You should be able to put a plane at the desired height and use the Split surface tool under modify in the Model Workspace.  This will create an edge for you to grab.  At that point you should be able to put a constraint on the edge that was created.  

To see an example of this you can take a look at the constraints in the Static Stress Tutorial.  To cause the radial constrain you would want to use the two in plane directions.

Does that make sense?  I have attached a picture to describe the plane location.  If I am way off just try to correct my course and I'll give it another shot.

Regards,

Todd

[Anonymous]

sorry not sure I understand.  Imagine a brake piston or a hydraulic cylinder but with a hollow ram( cup)  instead of a solid rod.  Pressure is applied and the ram extends until it hits an immovable object. Face is now constrained. Pressure is applied to the inside of the cup which is constrained at the extended face and somewhere along the radius by an oring seal. The deformation should occur in the radial direction between the face and seal. I want to run a circular constraint around the hollow cups wall to simulate the oring at a desired height. For example if the cup is 2 inches long I want the seal ( constraint) radial at 0.5" thus 1.5 inch is exposed to internal pressure and external ambient to allow deformation.

[todd_alford]

Hi @Anonymous,

If you can share your model I could take a swing at it and explain what I meant.  Would that be possible?

Thanks,

Todd

[Anonymous]

Sure thing Todd appreciate the help.

[todd_alford · Accepted solution]

@Anonymous,

Take a look at the attached model.  And power point to see if that clarifies it a bit.  I put some more thought into it and the oring isn't really a constraint as the cup would still be able to bend out there (breaking the seal).  If you wanted to constrain it there you could select and fix that edge.

Does that make more sense for what I was trying to explain earlier?

Thanks,

Todd

[Anonymous]

Very good Todd, thanks for the help. Makes sense once I saw  you could move an offset plane.