Analysis of plastic deformation under action of underwater explosion bubble on ship′s local structures

In the calculation,the shock wave load is only considered to be responsible for the plastic deformation of ship′s local structures,but the bubble is usually neglected.In order to study the plastic deformation of ship′s local structures subjected to underwater explosion bubble,the dynamic plastic reactioin to the typical form stiffened plate of ship′s local structures was simulated by using FEM software Abaqus.The underwater explosion load was calculated by using the Geers-Hunter model.The material was simulated by the Johnson-Cook model.The numerical results show that the displacement-time curve is divided into two phases.The simulation results are coincident with the experimental ones.As the plastic deformation induced by bubble load exceeds 30% of the total value,thus the bubble load cannot be neglected.