Research on the Material Selection Method for Preventing Fracture of Q690 High Strength Steel Applied to Arctic Jack-Up Platforms

Abstract In order to solve the problem of fracture prevention and material selection of high-strength steel for Arctic jack-up platforms at low temperatures, low-temperature fracture toughness tests and the complete Gurson model (CGM) finite element methods were used for Q690 high-strength steel, and corresponding fracture resistance formulas for the low-temperature material selection of high-strength steel for Arctic jack-up platforms were established. At the same time, based on the stress levels of different structures, considering the influence of welding residual stress and additional stress, combined with the calculation formula of fracture driving force for typical structures of Arctic jack-up platforms, a low-temperature crack-resistant material selection method for Q690 high-strength steel material is proposed. This method can effectively improve the selection efficiency of high-strength steel in low-temperature environments, which is of great significance for the application and promotion of jack-up platforms in the Arctic region.