自由装填式药柱贮存过程中的变形分析

Deformation Analysis of Free Loading Propellant in Storage

采用基于Total Lagrangian方法的三维粘弹性大变形增量本构关系,结合动态力学分析仪进行改性双基推进剂的性能测试,得到了自由装填式药柱贮存十年过程中的变形情况以及等效应力、应变值及分布。计算结果表明:经过长期贮存后,药柱产生的轴向下沉量约为0.16 mm,药柱外径增大约0.04 mm,内径几乎不变。包覆层与药柱之间的应力约为11.8 kPa,不会造成脱粘。此外,计算得出此类自由装填式药柱长期贮存中达到变形平衡的时间大约为半年,可根据贮存半年后药柱的变形量推算长期贮存后装药的变形情况。

Three-dimentional viscoelastic large deformation incremental constitutive equation was derived based on Total Lagrangian method. From materials property testing of composite modified double base （CMDB） propellant by dynamic mechanical analyzer （DMA） , deformation, equivalent yon raises stress and strain of free loading propellant in storage were obtained. The results show that the subsidence magnitude of solid propellant in the axis direction is about 0.16 mm. Outer diameter increases 0.04 mm and inner diameter is nearly unchanged. Stress between solid propellant and binder is about 11.8 kPa, which will not lead to dewetting. Balanceable time of the free loading propellant in long-term storage is about half a year. Thus the deformation of the free loading propellant grains in storage can be deduced by that of propellant stored for more than half a year.