Study Of Mechanical Performance Of The High-Energy Propellant And Rigid Modular Charge

The pressure endurance environments and conditions of high energy propellants in gun and the effects of propellant mechanical performances on gun interior ballistic and the safety had been studied in 30mm high pressure simulation gun. The simulating and inspecting methods of propellant dynamic mechanical performances in gun chamber had been developed. The corresponding characteristic parameters and methods had been put forward. The dynamic mechanics and the impact fracture theory of the high-energy nitroamine propellant had been analyzed. The impact fracture property of the high-energy nitroamine propellant had been studied using Izod impact and Charpy impact methods. The results showed that the impact-generated fracture tenacity G_c and fracture strength α_k were corresponding to single-base propellant and far better than those of M30 triple-base propellants. But, the characteristics of its adhered-elastic fracture in high temperature and brittle fracture in low temperature were discovered during impact load test The impact fracture mechanism of the high-energy nitroamine propellant had been put forward by studying the fracture appearances of impact fracture surface, the expansion of secondary crack and the weakness or failing of mechanical structure combined with the analysis of impact fracture properties and dynamic adhered-elastic properties and structures. The mechanical performances of the high-energy nitroamine propellant were improved by some technical measures, such as optimizing the polymer binder, the solid filling properties and the manufacturing process, and introducing some bonding agent into the constituent. The safety evaluating methods of propellant charge used in gun chamber had been provided. The safety of the high-energy nitroamine used in gun chamber had been analyzed. The results showed that their initial low burning rate characteristics have obvious effect on controlling the pressure waves strength in gun chamber, and can greatly improve the interior ballistic adaptability under pressure endurance environments. These are favorable to the safety of gun.Double-Modular charge scheme had been put forward by analyzing interior ballistic pattem of congruence and inequality structure. According to chamber structure of GC45-155mm gun, simulated ignition system and two-phase fliud theoretic model of modular charge ignition was designed and studied which provided theoretic and experimental basis for the design of modular charge ignition structure and developed ignition system of double-modular charge have identical and reliable function. The performance combustible container used at rigid modular charge, mechanical strength and erosion and heat resistibility and absorption of moisture, had been greatly improved by selecting and using reinforcing agent and wear reducing agent and surface-coating, and optimizing energetic component of the combustible container. Results of performance test show that the double-modular charge made up of module A and module B is preferable to the propellant charge of bag form in performances, and meet the needs of GC45-155mm gun for capable of interior ballistics.