# Sphere Deformation Simulation

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December 23, 2013, 06:43
Sphere Deformation Simulation
#1
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Milad Amin
Join Date: Dec 2013
Location: Erlangen, Germany
Posts: 4
Rep Power: 5
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Hello,
I am trying to simulate the deformation of a sphere which is placed between 2 cylindrical plates and is in contact with them. The plate in the bottom is fixed by FIXED SUPPORT and the plate on the top is under a SURFACE FORCE. I want to simulate the deformation of the sphere. I have couple of questions:

1. How can I give different mechanical data such as young's modules for each of the 3 bodies SEPARATELY? because I don't want the whole geometry to have the same mechanical properties.

2. Since everything is symmetric in my simulation, I expect to have symmetric results, but as you can see in results I get some deformation in the top plate which is not symmetric, I wonder why it is like that????

Thanks for any help
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 force.jpg (57.4 KB, 10 views) results.jpg (63.1 KB, 11 views)

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 December 23, 2013, 08:10 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,506 Rep Power: 25 Your physical model may be symmetric, but your computational model is not. With the Boundary conditions you described so far, your model is under-constrained and Ansys will add weak springs to prevent the solution from diverging. You have to add boundary conditions to your model to make fully-constrained. A simple solution would be to actually make use of the symmetry and model only a segment of the full model. With symmetry boundary conditions at the new boundaries you can already constrain some degrees of freedom which should be enough to make the model fully constrained.

 December 23, 2013, 08:19 #3 New Member   Milad Amin Join Date: Dec 2013 Location: Erlangen, Germany Posts: 4 Rep Power: 5 Thanks for your answer, I just wanted to fix the displacement of the plate to prevent it from deformation, but it didn't work.

December 24, 2013, 09:16
#4
New Member

Milad Amin
Join Date: Dec 2013
Location: Erlangen, Germany
Posts: 4
Rep Power: 5
Quote:
 Originally Posted by flotus1 Your physical model may be symmetric, but your computational model is not. With the Boundary conditions you described so far, your model is under-constrained and Ansys will add weak springs to prevent the solution from diverging. You have to add boundary conditions to your model to make fully-constrained. A simple solution would be to actually make use of the symmetry and model only a segment of the full model. With symmetry boundary conditions at the new boundaries you can already constrain some degrees of freedom which should be enough to make the model fully constrained.
I have fixed the problem with symmetric deformation, but still I do not know how to give different mechanical properties for each part separately, for example mechanical properties of gold for the sphere and diamond for the plates. (I am using static structural toolbox in ANSYS.)

 February 28, 2014, 04:52 #5 New Member     Florin Gheorghe Join Date: May 2013 Location: England Posts: 24 Rep Power: 6 Hello amingh, You just have to create the materials in Engineering Data (you must know the properties) and when in Mechanical, you can assign them to the desired geometry. __________________ Best regards, Florin

 Tags ansys, deformation, fea, mechanical, sphere

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