Learning Forum

[UP866106]

Hello Everyone,

I have created the Wheel Rim in Creo 3.0, I need a bit of help on determining and making sure the total deformation is low to continue later to topology optimize it. I am unable to go to the next stage as the stress are very high, is anyone able to help me with this problem. I am not sure if I have applied the fixed support in the right place 

[peteroznewman]

The Fixed Supports are fine.

1) Under Analysis Settings, turn on Large Deflection. This should reduce the magnitude of the Deformation.

2) A small angular deformation in the spokes allows a transverse motion of the rim, which is a rigid body motion.  It is more meaningful to plot stress and strain.

[UP866106]

Hi,

Thank you for information. Unfortunately after changing the settings on the magnitude of the deformation it came with different errors. I have changed the design of the wheel in Spaceclaim ANSYS to merge and create fewer faces, once I added the supports and loads to find the total deformations and stress before starting topology optimization on the model the program came with one error which is shown in the second image for this discussion which says (Your product licence has numerical problem size limits you have exceeded these problems size limits and the solver cannot proceed ansys). 

At the moment I am using ANSYS Workbench 19.1 on a Dell precision tower 5810 which should not be a problem calculating it, I have section the model in half and tried but unfortunately it did not work. I have read other discussions where Peter and others responded to the same problems, I followed the steps that was in the discussions to resolve the problem, but I am not quite sure where the error is. 

Does anyone know how to solve this problem, I look forward for any response.

Thank You.

[peteroznewman]

The free Student license you download here has a built in limit of 32,000 nodes or elements. The solver refuses to solve models larger than that.

If you are at a University, they can purchase Research licenses of ANSYS that have no limits.  Then computer RAM becomes the limit to model size.

[UP866106]

Hi Peterozenewman,

Sorry for late reply, I have tried to decrease and increase the mesh to see if it makes any difference but it did not work. Is there a way to decrease the nodes or elements so that the geometry runs?. I am using a university computer that has 16GB ram Supercomputer (Towercomputer).

 

 look forward to your reply as soon as possible.

 

Thank you

[peteroznewman]

The computer is okay for one wheel.  You need a university ANSYS Research license.  The free student license is not going to do it.

If you can't get a Research license, then you have to replace the solid model with an approximation called a midsurface model. That is surfaces at the center of the spoke wall thickness representing the spokes instead of solids.  The uniform wall thickness part of the rim can be replaced with a surface at the middle of the thickness.  This is a lot of geometry and is only an approximation, but that is all you can do to keep the node count down.