Three-Dimension Crack Propagation Behavior of Conical-Cylindrical Shell

The conical-cylindrical shell is prone to stress concentration in the convex cone position under action of deep-sea pressures. This results unidirectional or bidirectional positive tensile stresses on surfaces shell. a large, welded structure. Welding residual was generated at cone-column joint position, resulting high-stress this location. Under both welding and seawater pressure, cracks easily form propagate weld toe, leading fatigue damage even structural failure. In paper, based seawater’s alternating load welding, three-dimensional crack propagation process studied for submarine effects depth shape ratio trend life were analyzed. can provide references predicting trend, assessing remaining evaluating safety