TATB基PBX及其改性配方的蠕变性能

摘要

In order to investigate the effects of binder component on the creep properties of TATB-based polymer bonded explosive ( PBX),tensile creep properties,compressive creep properties and three-point bending creep behavior of TATB-based PBX were studied by electronic universal testing machine and dynamic mechanical analyzer, respectively. Results showed that creep resistance performance was improved by the addition of reinforcing agent( styrene copolymer)with high glass transition tempera-ture and high mechanical strength. The creep strain of modified formulation was decreased,creep failure time prolonged. The creep damage time of original formulation obtained by 50 ℃/3 MPa tensile creep,70 ℃/10 MPa compressive creep and 70 ℃/6 MPa three-point bending creep tests were 14,12. 7,12 min,respectively. However,modified formulation did not rup-ture under the same conditions. Based on time-temperature superposition principle,the master curves of TATB-based PBX and its modified formulation were obtained at reference temperature of 60 ℃. Compared with original formulation,the creep compliance master curves of modified formulation shifted downward and the creep resistance performance was enhanced.%为探讨粘结剂组成对 TATB基高聚物粘结炸药（ PBX）蠕变性能的影响，用电子万能试验机和动态力学分析仪分别研究了TATB基PBX及其改性配方的拉伸、压缩和三点弯曲蠕变行为。结果表明，加入高玻璃化转变温度和高力学强度的增强剂苯乙烯共聚物可改善 TATB 基 PBX 的抗蠕变性能。改性配方的蠕变应变降低，蠕变破坏时间延长。由50℃/3 MPa 下拉伸蠕变、70℃/10 MPa下压缩蠕变以及70℃/6 MPa下三点弯曲蠕变试验所得原配方的破坏时间分别为14，12．7，12 min，而同样条件下，改性配方未发生蠕变破坏。根据时温等效原理，获得 TATB基 PBX及其改性配方在参考温度60℃下的蠕变柔量主曲线。与原配方相比，TATB基 PBX改性配方的蠕变柔量主曲线向下偏移，抗蠕变性能提高。