Weld fracture under non-uniform stress distribution and its mechanism in CHS-CHS X-joints

Tubular joints are characterized by the non-uniform stress distribution. In order to study the influence of the non-uniform stress distribution on the bearing capacity of the weld for circular hollow section (CHS) joints and the fracture mechanism, monotonic tensile tests for 8 CHS-CHS X-joints were conducted. The specimens were designed utilizing coarse FE models using a triaxiality-and-Lode-angle-related fracture model to ensure the expected...