Study on velocity attenuation of spherical tungsten fragments by comb target

摘要

The fragment velocity is one of the important indexes to evaluate damage ability of fragment. When the fragment velocity is measured by comb target, there exists the problem of serious velocity attenuation after the fragment break through the target. It results the measured fragment velocity to be smaller. For the method of fragment velocity measurement based on comb target, on the premise that the material and shape of the fragment and the comb target are unchanged, a computational model of residual velocity for the fragment vertically break through a comb target is established.According to the model, the factors causing velocity attenuation of the fragment during penetration are divided into four types: comb target thickness, fragment incident velocity, size and incidence angle. The finite element simulation method is adopted to establish the simulation model of fragment breaking through the comb target. The difference between the simulation results and the experimental results, and the difference between the theoretical calculation results and the experimental results are compared and analyzed. The comparison results verify the reliability of the finite element simulation model, simulation results and theoretical calculation results. The normalization method and multiple linear regression method are adopted to process the simulation data.The quantitative mathematical relationship between the velocity attenuation and four kinds of factors is established. The relations shows that the larger the comb target thickness and the fragment incident velocity, the smaller the fragment size, and the larger incidence angle, the more obvious velocity attenuation of the fragment through the target will be. The research result provides a reference for the design of comb target.