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本研究采用体积压缩系数测量来确定固体推进剂中因气体逸出而导致的内部空隙含量(空隙区)的变化。而且测定了复合改性双基(CMDB)、交联双基(XLDB)和硝酸酯增塑聚醚(NEPE)三种推进剂体内空隙形成的速率。发现在400mm立方体内空隙含量和体积压缩系数,同用X—射线的检查结果具有良好的一致性。在这三种推进剂中,采用70和80℃下的高温贮存来加速空隙的形成。其中CMDB推进剂显示出最高的空隙形成速率。最后,探讨了断裂力学在空隙形成研究中应用的最新进展。
In this study, volumetric compression factor measurements were used to determine the change in internal void content (void space) in a solid propellant due to gas evolution. In addition, the formation rate of voids in the three propellants, CMDB, XLDB and NEPE, was measured. Found in the 400mm cube void content and volumetric compression factor, with the same X-ray examination results have good consistency. Among the three propellants, high temperature storage at 70 and 80 ° C was used to accelerate the formation of voids. CMDB propellants showed the highest void formation rate. Finally, the latest development of fracture mechanics in the study of void formation is discussed.