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ptc-50748771-Visitor
1-Visitor
August 6, 2013
Question

FEM on rubber disk

  • August 6, 2013
  • 1 reply
  • 6208 views

Hello everyone,

I am new to Creo simulation and met some problems as below:

1. I wanna see how much deflection of rubber disk could be if providing 10 bar on the surface of inner ring. Rubber disk is equipped in the plastic device ( showed in the picture), so when it moves up, it will be blocked by the contact surface with the device( marked as the red circle), which means I need define the constrait on the contact surface, but I dont know how to do that. The top and bottom of outer ring are placed on the plastic part , so I give a constraint on them as well.

2. The rubber disk and plastic device as an assembly part, I am not sure if it is ok to do FEM on an assembly part.

3. The deformation of rubber disk compares to the dimension of rubber disk is small, so I considered it as linear situation, is that ok?

If anyone can help with these problems, I would appreciate that:)

rubber+disk.JPG


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1 reply

D
DenisJaunin15-Moonstone
15-Moonstone
August 6, 2013

Hello, Jo,
I do not have a clear answer yet,
I am attaching a link where there is an issue with rubber, I can help it.
Cordially.
Denis.

http://www.ptc.com/products/creo-elements-pro/wf4/localized/fr/tutorial_3272/printable_page.htm

    P
    ptc-50748771-VisitorAuthor
    1-Visitor
    August 6, 2013

    Hi Denis,

    Thanks for your help, it is very helpful for later analysis:)

    But I still can not find a way to define the contace surface showed as red circle.

    When I do simulation, I can not choose the contace surface cause it is as a whole part showed as below, what should I do?

    Capture.JPG

    J
    JonathanHodgson13-Aquamarine
    13-Aquamarine
    August 6, 2013

    Do you need to know what happens if the rubber disk contacts the plastic part?

    Or do you only need to know whether it will contact?

    If the latter, I think you can analyse just the rubber disk. I would use mirror symmetry in two directions to reduce the model size (and to help constrain it!), and then constrain the top surface only in the direction of the pressure.

    I assume you know what the starting clearance is to the contact surface; you can therefore look at the maximum displacement value to decide whether the disk will contact under 10 bar.

    Edited to add:

    If you need to run it as an assembly* then you can select surfaces (and other entities) that you can't see by query-selecting, or (I think) tapping the right mouse button while highlighting your selection to cycle through other entities under the mouse pointer. It's sometimes useful to switch to hidden line or wireframe mode to do this.

    *Note: a part is a single component, which has a single material and cannot be disassembled; an assembly contains one or more parts or other assemblies, which may have different materials; there is no such thing as an 'assembly part'.

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