Creo Simulate > Modeling Structure and Thermal Problems > Structural Constraints > Displacement Constraints > Troubleshooting Your Constraints > Handling Stress Concentrations
  
Handling Stress Concentrations
If you apply constraints to datum points or curves, be aware of the following:
Point constraints can introduce theoretically infinite stresses or fluxes in both solid and shell models. These problems can lead to poor accuracy for analysis results.
Curve constraints can introduce theoretically infinite stresses or fluxes in solid models.
You may want to define a small surface region and apply the constraint to the region instead of to a point. This approach distributes the stresses and fluxes over a slightly wider portion of the model, avoiding concentration problems.
Alternatively, you can create one or more small excluded elements near the point or curve with the help of Isolate for Exclusion AutoGEM Control, so that results are not distorted in surrounding elements.