Study on the three-stage method to calculation scattering parameters of prefabricated fragments along the axis based on energy conservation

Abstract

To study the axial distribution rules of the initial velocity and direction angle of prefabricated fragments, first, the acceleration process of prefabricated fragments is divided into three stages:"detonation wave acceleration stage”,"metal medium interaction stage” and “detonation product acceleration stage”, to establish the three-stage detonation drive model based on energy conservation, the correction coefficients in the model were subsequently fitted using numerical simulations, finally, the test results are compared with the theoretical calculations of the model. The comparison results indicate: the axial distribution results of the prefabricated fragments initial velocity calculated by the three-stage detonation drive model fit well with the experimental results, and the error is within 100 m/s, and the axial distribution rules of the initial velocity showed a trend of the first increasing and then decreasing, the maximum value of the velocity all appeared at the ratio of the prefabricated fragment distance from the burst core to loading length was 0.7; the three-stage detonation drive model fit the results of axial distribution of the direction angle of prefabricated fragments accurately.