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Contact surface defination

Posted Nov 22, 2011, 12:53 p.m. EST Structural Mechanics Version 4.2 3 Replies

Pengchuan Wang
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Hello everyone,

I am trying to model a sphere pushing into a tapered cylinder. To do so, I have created a 2D model with a load. Since the two surfaces will be tangent to the sphere surface, I use contact pair to handle the point contact issue. The sphere will deform under this load and move forward a little bit. I want to know the distance under different load.
However, the plot of the distance indicates that something is wrong. The disntance of the contat point is zero, which is shown in the attachment
Does anyone know why this happens? I thought maybe this is a common problem that might root in a simple mistake in defining the contact.

Thank you

Pengchuan

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3 Replies Last Post Nov 27, 2011, 11:11 p.m. EST
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Nov 22, 2011, 2:19 p.m. EST
The problem seems to be that the sphere is attached to the plates at the contact points. Make sure you keep the parts separate by using the COMSOL Assembly instead of Union feature.

Nagi Elabbasi
Veryst Engineering
The problem seems to be that the sphere is attached to the plates at the contact points. Make sure you keep the parts separate by using the COMSOL Assembly instead of Union feature. Nagi Elabbasi Veryst Engineering
Pengchuan Wang
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Posted: 1 decade ago Nov 22, 2011, 5:04 p.m. EST

The problem seems to be that the sphere is attached to the plates at the contact points. Make sure you keep the parts separate by using the COMSOL Assembly instead of Union feature.

Nagi Elabbasi
Veryst Engineering


Can you make it more specifically? I didn't do any union operation on this model.
[QUOTE] The problem seems to be that the sphere is attached to the plates at the contact points. Make sure you keep the parts separate by using the COMSOL Assembly instead of Union feature. Nagi Elabbasi Veryst Engineering [/QUOTE] Can you make it more specifically? I didn't do any union operation on this model.
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Nov 27, 2011, 11:11 p.m. EST
Check the last node under Geometry. Change “Finalization method” to “Form an assembly” instead of the default “Form a union”.
Check the last node under Geometry. Change “Finalization method” to “Form an assembly” instead of the default “Form a union”.

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