多管火箭武器储运发射箱长期储存蠕变性能预测

为探究火箭武器储运发射箱长期储存的蠕变性能,制备复合材料层压板并开展单轴拉伸蠕变试验,获得了单向纤维复合材料主方向的蠕变本构模型参数。采用有限元方法并借助用户自定义材料子程序建立储运发射箱长期储存蠕变的数值分析模型,预测了堆码储存15年后底层发射箱的蠕变变形。以储存后的发射箱作为初始状态建立弹管耦合发射动力学仿真计算模型,进一步分析蠕变对火箭弹发射过程的影响。仿真结果表明:蠕变引起的定向器平行度和发射箱底面平面度的变化均小于技术指标规定值,定向器束的最大残余变形在三维空间内呈马鞍状分布,上、下两行中间位置定向器的变形最大,左、右两列中间位置定向器的变形最小。定向器蠕变变形使得弹管间隙减小,火箭弹在管内运动使弹管之间的动态接触碰撞力增大,离轨速度降低。

Prediction of creep performance for multiple launch rocket canister under long-term storage

In order to investigate the creep performance of multi-barrel rocket weapon launch canister under long-term storage, uniaxial tensile creep test was carried out on composite laminate and the creep constitutive model parameters of single layer in the main directions were obtained. The finite element method and the user-defined material subroutine were used to establish long-term storage numerical analysis model of launch canister. Creep deformation of the bottom launch canister after 15 years storage was predicted. Taking the stored launch canister as initial state, the dynamic simulation model of rocket-tube coupling was built, and the influence of creep on rocket launching process was further investigated. Simulation results show that the change of the parallelism of the director and the flatness of the bottom surface of launch canister caused by creep are smaller than the specified values of technical indicators. The maximum residual deformation of director bundle is saddle-shaped in three-dimensional space, and the deformations of the middle position directors for upper and lower rows are largest, while that of the middle position directors for left and right columns are smallest. Creep deformation of the director reduces the clearance between rocket and director, increases the dynamic contact collision force and lessens the off-track velocity of rocket.