In this article, ductile fracture on the tensile side of wrinkled cold bend pipes under monotonic combined loading condition is investigated through an experimental and analytical study. Two cold bend pipe specimens made of API X65 steel material were tested at the University of Alberta under increasing bending curvature with and without internal pressure. It was found that the pressurized pipe ruptured on the tensile side of the bulging wrinkle location, whereas, no fracture was captured for the unpressurized specimen. Numerical analysis is conducted by employing finite element simulation and the concept of damage mechanics to study the deformational behaviour and final failure modes of the pipe specimens. Comparison between analytical models and experimental data shows that the utilized cumulative damage approach could acceptably predict the final fracture of the pressurized cold bend pipe. Internal pressure is shown as the most critical factor in triggering the tensile fracture of wrinkled pipes.
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