Movement characteristics of high-velocity fragments in water medium: Numerical simulation using LS-DYNA

Based on the large-scale finite element analysis software ANSYS/LS-DYNA, the dynamic analysis model was established for the movement of a three-dimensional rectangular high-velocity fragment in water medium.The multi-material arbitrary Lagrangian Eulerian method was used to simulate the underwater movement process of the high-velocity fragment.And the velocity attenuation curve of the fragment was given.The velocity attenuation, the mushrooming rule and the shock wave propagation process were studied.The penetration performance of the high-velocity fragment was obtained by considering its velocity change.When the initial velocity is 910-1 115m/s, the mushrooming is definite, which will increase the penetration resistance for the fragment sufficiently.When the initial velocity is low, the penetration distance of the underwater fragment will increase with the increasing of its initial velocity.When the initial velocity arrives at some critical value, the penetration distance will decrease as the initial velocity of the fragment increases.