Rotating deformable parts in eroding contact in Abaqus Explicit

[Saqibanwar]

I am trying to model (3D) dressing process in which both the dressor and the grinding wheel are rotating as deformable bodies using ABAQUS 6.13 (Explicit analysis). I want to simulate a small portion from both wheels rotating against each other with general contact. To rotate them I am applying coupling constraint. However, when I apply coupling constraint to rotate the wheels with their respective reference points (RP's), they become rigid in sense that no stresses are developed. Even if I apply only VR3 to RP's, no stresses will develop in the grinding wheel or dressor. I have checked the contact stresses (CPRESS), these are generated temporarily when dressor contacts the grinding wheel surface and then vanished as the contact point moved on.

Initially to apply coupling constraint, I constraint all the nodes of each wheel segment to their respective RP’s and I got rotation of both wheels as rigid bodies. Later I tried to constraint only the base/bottom surface of each wheel to its RP, in this case only the bottom surfaces rotated about their RPs and upper segments of wheels did not move/rotate at all. This problem is not there in ABAQUS standard. I have attached the CAE files with both conditions.

Does anyone have any idea how I can overcome this issue. The main goal is to rotate both dressor and grinding wheel segments against each other and produce erosion in grinding wheel.

 

[rstupplebeen]

I looked at the Coupling_BaseOnly model from the Abaqus file.

I believe your issues arise from having a coupling constraint on the non-contacting faces and then instantaneously ramping to 200 radians/time.

Try using Predefined Fields for both to set the initial velocity for the entirety of both parts.

Since I'm not sure what you are exactly trying to model should you have the parts rotating about the global coordinate system or local ones at the Reference Points?

I hope this helps.



Rob Stupplebeen

http://www.optimaldevice.com

https://sites.google.com/site/robertkstupplebeen/

 

[Saqibanwar]

Dear Rob,

Thanks for the reply.
I have tried using the amplitude with VR=200 rad/sec and also I have tried using VT=1 rad/sec. However, it still did not work with same distortion on base.
Regarding using the predefined field, the problem is that the Predefined VR will slow down from its starting value during the analysis and this is not the case in reality where the motors attached to wheels rotate at constant velocity.
I have uploaded a new file with a simple disc. I tried to rotate this disc by using coupling constraints and rigid body pin type constraints, but it did not work here too. If you could please help me in sorting this simple disc problem, I will be able to solve the other problem with grinding wheel and dressor. Thanks a lot for your valuable time.

Regards
Saqib

 

[addy303]

Hi Saqibanwar..did u find any solution solution for that problem..because I too going through same problem.
I want a rotating disc to contact a rigid body and slide.
When I give VR3 and V1 to ref point in two diff steps, its says we cant define two conditions in one node.
How have you solved that problem..