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关于推进剂组合药柱结构优化设计问题,由于自由装填式组合药柱/包覆层与发动机壳体间存在一定的间隙,发动机工作时组合药柱内表面承受均匀内压,而间隙内的压强则以不同速率增加至最大值。由于药柱存在应力应变集中区域,试车中容易发生爆炸。为此提出线粘弹性有限元法,研究了间隙内有无压强两种极端情况下的组合药柱的结构完整性。仿真结果表明间隙无压强时组合药柱的最大米赛斯应变要大于有压强的结果,于间隙内不稳定增压过程动态变化且难以数值仿真,对于自由装填式组合药柱在进行结构完整性设计时,可按照间隙内无压强进行考核,可提高结构的安全裕度。
As for the optimization design of the propellant composition of the column structure, due to the free-fill combination of drug column / cladding and the engine casing there is a certain gap between the inner surface of the composition of the cylinder to withstand uniform pressure within the engine, and the gap pressure Then increase to a maximum at different rates. Due to the existence of stress concentration strain column area, easy to test the explosion. For this purpose, a linear viscoelastic finite element method is proposed to study the structural integrity of the composite pellets under both extreme pressure and pressure conditions in the gap. The simulation results show that the maximum misce strain of the composite grain is greater than that of the composite grain without pressure in the gap, and the dynamic process of instability pressurization in the gap is dynamic and difficult to be numerically simulated. For the structural integrity of the free- Design, can be no pressure in the gap assessment, can improve the safety margin of the structure.