Hello everyone,

I want to simulate SKF bearing 6308 in ANSYS Workbench explicit dynamic. I created the model as below, but for simplifying the model, I used 3 balls for the bearing. 

The inner race of the bearing has a local fault. As it clear on the outline, I used frictional contact (coef=0.005), an angular velocity of 1000 RPM for the inner ring, fixed support of the outer surface of the outer ring, and end time 0.018 (for one complete revolution). I did not consider any radial load. After solving the problem, I realized that only the inner ring rotates and the cage and balls slip a little (3-5 mm). For this problem, I changed the frictional coef from 0.005 to 0.1 and even no separation. But, still, I did not see any rotation in balls. They just slip a bit with the inner ring. One more time, I assigned clearance between balls, races, and the cage. Again, it did not work (clearance 0.01 mm).

It was weird why balls do not follow the rotation of the inner ring. As a result, I created a simple model similar to bearing the cross section with a ball between them. As shown in the picture below. 

By moving the upper part to the right, again the ball remains constant without any rotation. It just has a bit displacement (slipping). 

I really appreciate if anyone can help me step by step to solve this problem. 

Thank you.