# How to model friction in ansys?

1. Nov 29, 2012

### sgvaibhav

I have to model friction in ansys workbench for the geometry i attached - static structural analysis.

I basically have to define the contacts...
I dont know what contact settings to keep... so can someone suggest me what contact settings to keep?

Loads are applied at the two ends
The support is in the center...

So there is friction in the beams - downwards force of 500N is applied on both sides.

It will be great if someone can suggest me what contact settings to keep in ansys workbench

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2. Nov 30, 2012

### sgvaibhav

i mean "contact" settings under "connections" sections in the model of static structural analysis.

what effect does the pinball region have on the analysis?

3. Nov 30, 2012

### CFDFEAGURU

It is all in the help manual. If you are using ANSYS traditional then the command is PINB. In Workbench, it is the same command.

From the ANSYS Help Manual:

"A contact element is considered to be in near-field contact when its integration points (Gauss points or nodal points) are within a code-calculated (or user-defined) distance to the corresponding target surface. This distance is referred to as the pinball region. The pinball region is a circle (in 2-D) or a sphere (in 3-D) centered about the Gauss point."

So, the greater the diameter of the sphere the greater the area of contact. Be careful to set this parameter correctly because unintended contact behavior can occur.

Thanks
Matt

4. Nov 30, 2012

### CFDFEAGURU

I am not sure how to use Workbench all that well. I am a Traditional user. Your geometry is not all the complex, I think you would do better using Traditional with a 2D model and invoking the contacts via the EINTF command using offset nodes. Also, I am not sure of what you are solving for i.e. stress and/or deflection or something else.

Thanks
Matt

5. Dec 1, 2012

### sgvaibhav

oh, i found the manual, but it was like 290 pages long..

I use workbench because i import the geometry from solidworks.

Basically i have not used friction before, all i that is going to happen in this analysis is that, there is friction between all these 'leaves'.
Applying the forces causes deflection of leaves, and since these leaves are joined/constrained by geometry... all these will slide together forming a rigid structure.

6. Dec 1, 2012

### CFDFEAGURU

If the leaves deform as a rigid structure then just leave out the friction and model it a s a rigid structure.

The manual can easily be searched with the command name PINB. It took me about 3 seconds to find it.

Thanks
Matt

7. Dec 1, 2012

### sgvaibhav

PINB is not my only concern :P

there are many other settings such as

advanced formulation, interface treatment to name a few...

i would have tried taking ur help, but i dont know the ABC of APDL...

do u know any ansys workbench forums?

btw thanks for your help :D

Last edited: Dec 1, 2012