How prevent an object from penetrating another object?

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Greg Nordin

Greg Nordin

December 12, 2012 1:12am UTC

How prevent an object from penetrating another object?

The attached file has a simple case that is a precursor to what I really need to model. The simple case consists of a membrane (hyperelastic material model) with a small quartz bead located a short distance underneath the membrane. A force is applied to the top of the membrane such that it deflects downward toward the bead. The bead is constrained to remain fixed in space. As the membrane deflects to where it hits the bead, I want to see how the membrane deforms around the bead. However, as shown when you click on "3D Plot Group 4", the membrane does not know the bead is there and becomes superimposed on it within the same volume. How do I prevent this from happening such that I can study how the membrane deforms around the bead? Any assistance would be greatly appreciated!

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Henrik Sönnerlind

Henrik Sönnerlind
COMSOL Employee
Sweden
Moderator

December 12, 2012 7:34am UTC in response to Greg Nordin

Re: How prevent an object from penetrating another object?

Hi,

You need to add a Contact Pair under Definitions, and then a Contact feature under Solid Mechanics where you select the contact pair. As the bead is fixed, it must be chosen as "Source" in the contact pair.

Make sure that the shape of the rather small bead is well resolved by the mesh.

Regards,
Henrik

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Greg Nordin

Greg Nordin

December 14, 2012 7:28am UTC in response to Henrik Sönnerlind

Re: How prevent an object from penetrating another object?

Thanks, Henrik. I followed your instructions, and also increased the bead size to avoid potential meshing problems. These are included in the attached file. Note, however, that the membrane still doesn't behave correctly in that (as shown in 3D Plot Group 4) the bead comes partially up through the membrane, rather than the membrane deforming around the bead. What am I missing?

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