A Continuous Calculation Method for Fragments Dispersion Characteristics of Near Field and Remote Field

For energetic materials with complicated structure, fragment dispersion characteristics of near field and remote field cannot be calculated continuously. A calculation method combining finite element and self-programming is proposed. Near field fragments model has been established with LS-DYNA to obtain near field fragments characteristics. The data interface of near field and remote field fragment is developed with MATLAB. Remote field dispersion model is established with mass-point ballistics, which can realize rapid and automatic calculation of dispersion characteristics such as fragment number, mass distribution, velocity attenuation, dispersion direction, and target distribution at any distance from explosion center. The calculations results were compared with test results of energetic materials fragments within 3m. The results show that velocity decay curves of continuous calculation method are close to experimental fitting curves, with maximum errors of 7%, 11% and 13% at 1m, 2m and 3m, respectively.