壳体约束下浇注PBX的温度适应性

为研究壳体约束条件下浇注高聚物黏结炸药(PBX)的温度适应性能,制备了组分为奥克托今(HMX)/端羟基聚丁二烯(HTPB)/2,4-甲基二异氰酸酯(TDI)的炸药,分别装填Ф20 mm×20 mm、Ф15 mm×65 mm、Ф100 mm×200 mm、Ф150 mm×300 mm和Ф200 mm×400 mm五种尺寸的试样,其中后者三种较大尺寸的试样还分为无缺陷和有预制缺陷两种形式。利用-55~70℃温度冲击和温度循环试验,研究了浇注PBX的内部损伤、壳体外部温度和应变以及炸药尺寸、密度和力学性能变化。结果表明,温度冲击和温度循环试验后,浇注PBX没有明显的热损伤,原有缺陷也没有明显扩展;随着试验件尺寸的增大,通过升降温达到温度平衡所需的时间延长,高低温应变变化呈现减小的趋势。试验后炸药密度增大0.001 g·cm~(-3),拉伸强度和压缩强度分别提高了0.12 MPa和0.55 MPa。

Temperature Adaptability of Cast PBX under Restriction of Shell

To research the temperature adaptation performance of cast polymer bonded explosive (PBX) under the condition of shell restriction,explosive of component as HMX/HTPB/TDI was prepared,and five specimens were charged with the size of Φ20 mm×20 mm,Φ15 mm×65 mm,Φ100 mm×200 mm,Φ150 mm×300 mm and Φ200 mm×400 mm,respectively.In which,the latter three specimens of larger size were divided into two forms of "without defect" and with "pre-prepared defect".The change in internal damage,temperature and strain of shell external,and size,density,mechanical properties of the explosive was studied by temperature impact test and temperature cycle test of-55-70 ℃.Results show that after temperature impact test and temperature cycle test,there is not obvious thermal damage in the cast PBX and the original damage does not extend obviously.With the increase of specimen size,the time required to reach temperature equilibration via heating and cooling is prolonged and the change in high and low temperature strain reveals a trend of decrease after tests,the density of the explosive increases by 0.001 g · cm-3 and the tensile strength and compressive strength increase by 0.12,0.55 MPa,respectively.