Research on nonlinear buckling of cylindrical shell with weld penetration crack under axial compression
Under the action of alternating load and Marine corrosive medium,the leg of jack-up drilling platform is prone to crack at the weld,which leads to local buckling and greatly reduces the service life of drilling platform.In this pa-per,the cylindrical leg of jack-up drilling platform is simplified as a cylindrical shell with axial and circumferential penetrat-ing cracks,and the nonlinear buckling characteristics under axial compression are analyzed.Through the axial compression experiment,the relationship between the weld position and the buckling strength was analyzed,and compared with the crack-free cylindrical shell to determine the load-displacement curve,instability load and final instability mode of the shell.The results show that when the shell is damaged by axial compression load,one end of the cylindrical shell with axial weld will form a circular bulge,while the cylindrical shell with circumferential weld will have an obvious depression at the weld toe,and the bearing capacity will be reduced;In addition,the through crack defect at the weld will reduce the bearing capacity of the cylindrical shell and affect the critical buckling load.
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