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Non-linear contact area, average stress issues

Question asked by Glenn J on Oct 19, 2013
Latest reply on Oct 19, 2013 by Bill McEachern

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Hi everyone,

Having some issues here:

I am displacing a sphere into a flat rubber surface using NL Static simulation. I am trying to determine the vertical reaction force of the rubber surface due to it being displaced. For this, I need to determine the contact area of the two parts when displaced, and just the average vertical stress for that contact area.

I can't get the measuring tool to measure the diameter of the contact area from the deformed shape, and I'm not sure how to determine the average stress of a particular area.

Any help would be appreciated.

Thanks!

Glenn

Alessandro Tornincasa Oct 19, 2013 7:13 AM

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Hi Glenn,

If you click on a surface SolidWorks Simulation will give you the contact force (resultant and components). Just right click on the results folder and choose list result forces). If you create a stress plot you can choose to plot contact pressure, which will give you an idea of contact are.

Estimating it is quite tricky: here's a post from my blog that shows how: http://solidworkseducation.blogspot.it/2012/04/determinazione-dellarea-di-contatto-tra.html?m=1

Cheers,

Alex

www.solidworksacademy.blogspot.com

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Alessandro Tornincasa Oct 19, 2013 7:13 AM

Hi Glenn,

Estimating it is quite tricky: here's a post from my blog that shows how: http://solidworkseducation.blogspot.it/2012/04/determinazione-dellarea-di-contatto-tra.html?m=1

Cheers,

Alex

www.solidworksacademy.blogspot.com

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Bill McEachern Oct 19, 2013 9:54 AM

You can get the force, assuming no other contacts exist on the selected surface by the method suggested above by Alessandro.
You could infer the areas you are interested in by getting the peak deflection of the sphere (ie its center or initial point of contact) and assume the contact patch is spherical (likely a very close approximation if the sphere is much stiffer than the rubber) and the just truncate the sphere at the required displacement, assuming initial tangency contact. You can force a node at the initial contact point via a split line.

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Alessandro Tornincasa Oct 19, 2013 7:13 AM
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Correct Answer
Hi Glenn,
If you click on a surface SolidWorks Simulation will give you the contact force (resultant and components). Just right click on the results folder and choose list result forces). If you create a stress plot you can choose to plot contact pressure, which will give you an idea of contact are.

Estimating it is quite tricky: here's a post from my blog that shows how: http://solidworkseducation.blogspot.it/2012/04/determinazione-dellarea-di-contatto-tra.html?m=1

Cheers,

Alex

www.solidworksacademy.blogspot.com
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Bill McEachern Oct 19, 2013 9:54 AM
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1. You can get the force, assuming no other contacts exist on the selected surface by the method suggested above by Alessandro.
2. You could infer the areas you are interested in by getting the peak deflection of the sphere (ie its center or initial point of contact) and assume the contact patch is spherical (likely a very close approximation if the sphere is much stiffer than the rubber) and the just truncate the sphere at the required displacement, assuming initial tangency contact. You can force a node at the initial contact point via a split line.
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Non-linear contact area, average stress issues

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