Anti-Shock Calculation of Titanium Alloy Fairwater Domes

The fairwater dome is a crucial head structure of naval ships,and its anti-shock performance subjected to underwater explosion is of vital importance.In this paper,a finite element model of titanium alloy fairwater dome was established resorting to the finite element calculating software ABAQUS,on which the numerical simulation of underwater explosion was conducted through coupled acoustic-structur al analysis.By selecting the proper boundary condition of the fairwater dome on board installation and the impulsive condition of non-contact underwater explosion,dynamic responses including the equivalent plastic strain(PEEQ),displacement,acceleration of the fairwater dome were obtained.The frequency characteristic and the impact environment at the array location were also presented.The result shows that the bottom outer plate is the most fragile part of the fairwater dome,and the frequency response of the in stalled array consists of mainly low and intermediate frequencies.