Boundary Conditions for a shaft for Fatigue Failure analysis

- June 19, 2020 at 1:16 pm
  
  PayalTalda
  Subscriber
  
  Hello. I am trying to analysis fatigue Failure of a stepped shaft supported at two ends by bearings and a torque of 35Nm to be applied for its rotation of 2.81 rad/s. All this in static structural.
  However, I am unable to simulate the bearing support.
  I have tried applying rotational velocity & moment as the boundary conditions, but on solving ansys shows an error that the model in not sufficiently constrained for rigid body motion.
  Could someone please help me?
- June 19, 2020 at 2:11 pm
  
  Wenlong
  Ansys Employee
  
  Hi PayalTalda,
  
  You may need to add cylindrical support to constrain the axial movement.
  
  Please let me know if it helps.
  
  Regards,
  
  Wenlong
- June 19, 2020 at 2:25 pm
  
  PayalTalda
  Subscriber
  
  Hi,
  
  Thank you for the reply.
  
  I have tried using the cylindrical support, constraining the radial & axial movement.
  
  However, it shows the same error.
  
  Best Regards,
  
  Payal
- June 19, 2020 at 3:08 pm
  
  Wenlong
  Ansys Employee
  
  Hi Payal,
  
  Sorry that I know you have described your boundary condition clearly, but can you post some images of your boundary conditions?
  
  Thanks,
  
  Regards,
  
  Wenlong
- June 28, 2020 at 7:14 am
  
  PayalTalda
  Subscriber
  
  Hi Wenlong Thank you for ur input. My problem is solved using fixed support by trial & error.
  
  Regards Payal