Sean Harvey
Ansys Employee

Hello Zhangi,

Contact Stress can often be singular for various reasons. 

Here are some recommendations.

  • Refined mesh with a comparable mesh size between the contact and target
  • Smooth curvature, so contact normals are not very different
  • Use the Nodal project normal from contact detection method in the contact details. This detection method has a more rigorous treatment.  Please see the help location for details. 13.174. CONTA174 - 3D 8-Node Surface-to-Surface Contact (

Let us know if this helps.