Low stresses but enormous displacements
Altair EmployeeHi,
I am currently trying to Simulate a Wheelhub for a Formula Student Car in Altair Hyperworks. But the Problem is that my Analysis shows Stresses of around 140 MPa which is totally acceptable for Aluminum but the Displacement has a Value of 1-4 Kilometers.
The Wheelhub is constrained with Rigid-Elements on the Surfaces for the Bearings. These are Connected to Constraints allowing movement in the Moment-Directions and on one Bearing in the Y-Direction. The Rigids have no dof.
When I locked all dof´s on the constraints and allowed the movements in the Rigid-Elements, the Displacement became realistic. But the Results should be the same in both Cases or am I getting this wrong?
Or is there any other Reason why the Displacement reaches these High-Values?
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Hi,
attached you find the .out file of the last Analysis Run.
Hi LuHuck,
In your out file I can see the warning message saying that compliance is too large or negative.
Check your boundary conditions. Large compliance means, your model 'flys away'.
One cause can be no stiffness, another as stated missing contact definitions, another can be missing links in rigids or wrong BCs.
Hi,
Could you share some screenshot of your model with loads & boundary condition for more information?
Regards
Rahul R