Tensile Fracture of Wrinkled Cold Bend Pipe under Monotonic Loading Condition

摘要

In this article, ductile fracture on the tensile side of wrinkled cold bendpipes under monotonic combined loading condition is investigatedthrough an experimental and analytical study. Two cold bend pipespecimens made of API X65 steel material were tested at the Universityof Alberta under increasing bending curvature with and without internalpressure. It was found that the pressurized pipe ruptured on the tensileside of the bulging wrinkle location, whereas, no fracture was capturedfor the unpressurized specimen. Numerical analysis is conducted byemploying finite element simulation and the concept of damagemechanics to study the deformational behaviour and final failure modesof the pipe specimens. Comparison between analytical models andexperimental data shows that the utilized cumulative damage approachcould acceptably predict the final fracture of the pressurized cold bendpipe. Internal pressure is shown as the most critical factor in triggeringthe tensile fracture of wrinkled pipes.