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为探究由不同配方、不同工艺组合制备而成的固体推进剂组合装药界面的力学性能,在一定温度下(20℃,50℃,-40℃),采用材料拉伸实验机测定了基于NC/NG/RDX改性双基推进剂体系的粒铸和浇铸推进剂配方及其组合药柱的抗拉强度和伸长率,并利用扫描电镜-能谱联合分析仪分析了断裂面的形貌及元素分布。结果表明:由粒铸工艺制备的改性双基推进剂和由浇铸工艺制备的改性双基推进剂组合而成的推进剂组合药柱间界面的力学性能与浇铸推进剂接近,界面强度对组合装药整体力学性能的影响非常小,组合装药力学性能由力学性能相对较弱的一级推进剂决定;另外,推进剂配方中所含的Al2O3在界面处形成堆积,其对组合药柱燃烧性能,尤其是过渡燃烧稳定性产生的影响有待进一步研究。
In order to explore the mechanical properties of the solid propellants combined charge interface prepared from different formulations and different technology combinations, the mechanical properties of the solid propellants were tested at a certain temperature (20 ℃, 50 ℃, -40 ℃) / NG / RDX modified double-base propellant system of granular casting and casting propellants formulations and the combination of tensile strength and elongation of the column, and the use of SEM / EDS analysis of the fracture surface morphology and Element distribution. The results show that the mechanical properties of the propellants combined with the modified propellants prepared by the casting process are similar to that of the propellants. The interfacial strength The mechanical properties of the composite charge are very small. The mechanical properties of the combined charge are determined by the first-level propellant whose mechanical properties are relatively weak. In addition, the Al2O3 contained in the propellant formulation accumulates at the interface, The effects of combustion performance, especially transitional combustion stability, are for further study.