ABSTRACT
Titanium alloy materials have the characteristics of high specific strength, good seawater corrosion resistance and non-magnetism. Submarines built of titanium alloy have a greater depth of submergence, but at the same time, the visibility of the deep sea is extremely low. When the submarine navigates near the seabed, there is the possibility of collision with structures such as seamounts and reefs, which is the most dangerous condition for titanium alloy submarine navigation. In view of the above problems, this paper first designed and carried out the dynamic mechanical property test of TC4 titanium alloy, and fitted the dynamic constitutive model parameters of the material; Based on the nonlinear finite element program, a numerical model of underwater impact of TC4 titanium alloy pressure shell is established, and the structural damage deformation, impact load and energy changes during the impact process are analyzed, and the residual bearing capacity and structural failure mode are analyzed. On this basis, the effects of impact parameters such as impact velocity and hydrostatic pressure, are further discussed. The results can provide a reference for the safety of underwater vehicle navigation.
