热固性浇注 PBX 力学行为的影响因素探讨

利用拉伸实验、压缩实验、巴西实验对浇注黏结炸药（PBX）的力学行为进行了研究,探讨了影响浇注PBX 力学行为的因素。实验结果表明,浇注 PBX 的力学行为分为脆性断裂和延性断裂两种形式；在固化阶段的不同时间点浇注 PBX 的力学行为不同,当固化度为70％--80％时,浇注 PBX 表现出延性断裂的特征；当浇注 PBX 的固化度在80％以上时,药柱的力学行为受到固化温度和胶黏剂分子量等的影响。对于含有同一分子量端羟基聚丁二烯（HTPB）的浇注 PBX,固化温度越高,其力学行为越趋近于脆性断裂特征；经同一固化温度后,HTPB分子量越小,浇注 PBX 的力学行为越趋近于脆性断裂的特征。对产生上述现象的原因进行了分析。

Influence Factors of the Mechanical Behavior of Thermoset Casting Plastic Bonded Explosive

Mechanical behavior of cast plastic bonded explosive （PBX） was studied by tensile test, compression test and Brazilian test, in order to examine influence factors of mechanical behavior. Experimental results show that the damage behaviors of PBX exhibit two forms： brittle fracture and ductile fracture. Moreover, casting PBX at different time during its curing leads to different mechanical behaviors. When curing degree is between 70% and 80% , the damage of PBX is duc-tile fracture, while with curing degree greater than 80% , mechanical behavior of PBX is affected by curing temperature and molecular weights of adhesive. To HTPB with same molecular weight, the higher the curing temperature, the more likely its mechanical behavior approaching to brittle fracture; At the same curing temperature, the smaller the HTPB molecular weight, the more likely its mechanical behavior approaching to brittle fracture. The reasons for the above phenomenon were analyzed.