内衬结构对活性破片高速驱动影响规律研究

To achieve high velocity and high integrity of the reactive fragment during explosive driving, the influence rule of a lining structure on high-speed driving of reactive fragment was studied. Based on the law of energy conservation, a new model of initial speed of preformed fragment was established by theoretical derivation, which considers the elongation of lining material. Three linings of 2A12 aluminum, 20 steel and 20 steel/aramid composite structure were selected. Based on the equation of state, the interfacial pressure on the contact surface between the lining and the fragment was analyzed. The breakage of reactive fragments and the new model were verified by a static explosion test. Results show that the elongation of 20 steel is 145. 83% higher than that of 2A12 aluminum, the loading ratio of warhead with 20 steel/aramid composite lining is 14% lower than that of 2A12 aluminum lining, and the initial fragment velocity is 10.85% higher. The new model is well consistent with the experiment results, and its calculation accuracy is more than 8% higher than the existing model. Based on experimental results and theoretical analysis, it is shown that the reactive fragments remain integrity at a driving speed of more than 2 300 m/s by using 20 steel/aramid composite lining.