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Participant

Join Date: Aug 2014
Posts: 2

Rolling Contact in Ansys Workbench

08/20/2014 7:44 AM

Hi,

Please refer to the figure given below. I want to model this problem using ANSYS WORKBENCH.

My problem is to model a deep groove ball bearing with outer and inner ring and balls in "rolling contact" in between,
which is analogous to a slab (elastic deformable), resting on two balls (elastic deformable), on a flat surface (rigid).
A velocity is given to the topmost flat surface on which the balls are being supported, while the lower slab is fixed.
I need to give rolling contact between the balls and the slab, which i m unable to achieve; and then evaluate the contact stresses acting on the surfaces.

I am able to achieve sliding contact in rigid dynamics, which does not allow elastic deformation of the upper slab and the balls, not solving my purpose; whereas in static structural, the bodies are flexible but no motion between the contact points.

I would appreciate if anyone can provide some tips on modelling this in ANSYS WORKBENCH, most importantly, how to create a "rolling contact" in flexible bodies.

Thanks in advance.

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#1

Re: Rolling Contact in Ansys Workbench

08/20/2014 3:31 PM
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#2

Re: Rolling Contact in Ansys Workbench

08/20/2014 5:49 PM
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#3

Re: Rolling Contact in Ansys Workbench

08/20/2014 6:02 PM

Only available at LynDoor.con\Hoaxes R US.

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#4
In reply to #3

Re: Rolling Contact in Ansys Workbench

08/21/2014 12:46 AM

Well, foiled at my own game.

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Join Date: Jun 2014
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#5

Re: Rolling Contact in Ansys Workbench

08/21/2014 7:09 AM

This sounds like a fun project and a complete waste of time. Why do you need to this since it has already been done by the bearing manufacturers.

Contact SKF or get one of their catalogues, all the information you need has already been recorded. All you have to do is select a suitable bearing for your load and speed and do not exceed the rated loads and speeds and you will at achieve the L10 life of the bearing. Less load and speed will allow the bearing to last well beyond the L10 life.

I have modeled and calculated hertzian contact stress for many different applications but I would never consider doing it for a bearing since I don't get paid to do someone else's job that has already been done countless times.

here is screenshot of a spreadsheet I made for this purpose:

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Join Date: Aug 2014
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#6
In reply to #5

Re: Rolling Contact in Ansys Workbench

08/21/2014 12:48 PM

Sir, I appreciate your time and response but I am yet in the learning phase of the software. I want to pursue this as my term project and the only problem I am facing is creating a "rolling contact" which I am unable to find in any tutorial on the internet. Once I get through this initial stage, I might think of other applications of the same and further innovations which someone else has not done already.

I would be really thankful if someone who has worked on something like this (a wheel on a track, or bearings) can guide me as to what parameters I should set in order to get a rolling contact, and on what platform should I work on (static structural- where bodies are flexible but no motion, or rigid dynamics- where motion achieved is sliding but bodies are rigid, or explicit dynamics-which does not give stresses and deformations).
I have tried everything, but the result is always a sliding contact or no motion at all between the bodies. It will be of great help if you could throw some light on it. Thanks

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#7

Re: Rolling Contact in Ansys Workbench

08/21/2014 1:48 PM

ahh, OK. Well since you have tried everything. The next thing to do is to call or email:

http://www.ansys.com/About+ANSYS/ContactsLocations

which is ANSYS WORKBENCH and ask a techy there if such a thing as you are attempting can be accomplished using this platform and if so, where can you find a tutorial that can teach you how to do it.

I use Solid Works so I can be of no further help to you.

Good Luck!

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#8

Re: Rolling Contact in Ansys Workbench

08/21/2014 4:08 PM

NASA has developed bearings with 60NiTi. In the webinar they produced, the opportunity to ask questions was offered. My question concerned VFD eddy current effects, The Bottom line here is NASA offers a vast amount of technical information to be shared with the public.

The key is, this material 60NiTi actually has temporary deformation.

Perhaps they can advise on what direction you should take.

https://technology.grc.nasa.gov/tech-detail-coded.php?cid=GR-0101

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