Buckling pressure of imperfect spherical shell damaged by concentrated impact load

Abstract

Spherical pressure shells are an important component to ensure the safety of personnel and equipment. Due to the impact of seabed reefs, marine organisms and floating objects, spherical pressure shells undergo different degrees of deformation, leading to a sharp decline in buckling pressure. Therefore, the buckling characteristics of spherical shells damaged by concentrated impact load were studied using an experiment and numerical calculation. The crater formation of spherical shells under impact was generated by striking the spherical shell with a drop hammer. The collapse pressure and the final failure mode were obtained through a hydrostatic test to verify the validity and accuracy of the numerical calculation results. Numerical calculation entailed plastic deformation model and residual stress. On this basis, the effects of the impact velocity, impact angle and residual stress on the buckling of spherical shells were studied.