SaiD
Ansys Employee

Hi,

There is a learning track with 4 courses: Pre-loaded Bolted Connections - ANSYS Innovation Courses You might find something helpful there.

Could you post a cross-section view of the assembly? Does the horizontal pipe end near the region where the high stresses are observed on the bolts? I wonder if there is a sharp corner contacting the bolt that could be causing this. Maybe you could also post a picture with the mesh.