The Digitalized Method Of Energetic Material Particles And Computer Simulation Under Mesoscopic Scale

Using Material Science and High Performance Computer simulate mesoscopic mechanical change of energetic material in the suppression process, for the purpose of saving the cost and reducing the risk of the experiment, and providing beneficial reference to energetic material’s suppression technology and explosive element design. Construction of the digitalized model of energetic material by computer is the extremely important part of simulation. The available digitalized methods at the present are mostly confined to two-dimensional suppression model of the explosive particle order arrangement, unlike the explosive particle distribution in the mold of experiment. In addition, the simulation data and experimental data has a large deviation.To solve this problem, the thesis puts forward an algorithm of energetic material approximating ball-type filling. The algorithm divides the generation process of the explosive particle to two steps. At first, it controls the range of particles which are about to be generated to reduce gap among particles and then it has a subtle change to arrange particles intensively in the mold, which improves the filling rate of explosive particles in the mold. At the same time in order to simplify the modeling in the Linux system, and easy to set the parameters of the simulation stage, Uintah inputfile document generation management system is designed. By calling the above algorithm, putting explosive particles whose size and location are at random in the suppression mold, and then getting the Uintah script, build a three-dimensional suppression model of the explosive particle under mesoscopic scale. Using the Uintah program whose core algorithm is material point method to conducts a numerical calculating of the explosive particle’s suppression process and cut down the simulation time by parallelization techniques, and then visualize the pressing process by VisIt software.Analysis the explosive particles’ deform, forces and temperature change trends in the pressing process between regularly arranged, randomly arranged and experiment, experiment results show that the pressure and temperature data is more consistent with the experimental data by the randomly arranged model of explosive particles constructed by this thesis. Observing the mesoscopic structures of pressed explosive particles in the experiment, the mesoscopic structure of pressed randomly arranged model from simulation conforms to the experimental, compared to the regular arrangement model, which proves validity of simulation and plausibility of digitalization of energetic material. It provides a theoretical foundation for the experiment of the explosive particle’s suppression.