To predict the long-term storage capability (LTSC) of composite directors for multiple launch rocket system (MLRS) in the actual environment, a creep constitutive model was established in a three-dimensional nonlinear form, which considered the moisture effect by introducing a moisture shift factor that related to moisture absorption (MA) into the nonlinear Schapery equation. The constitutive model in integral form was transformed into the incremental-iterative form to realize the numerical finite element solution. Quasi-static experiments and short-term creep-recovery tests for E-glass/6509 epoxy resin laminate were performed to obtain the moisture and stress dependent parameters. A coupled numerical model in multi-physical field of moisture diffusion-nonlinear creep was established, and the MA process and creep deformation of composite directors during storage were predicted. The influence law of creep strain on rocket launching was further investigated by establishing the coupled rocket-directors launching dynamics model. The results show that the water diffuses to the inner surface of directors after storage one year in the environment of temperature of 30°C and relative humidity of 70% RH, while a saturated MA state was reached after 8 years storage. Maximum residual strain (RS) in 20 directors locates between the 2nd and 3rd positioning mounting rings, whose distribution likes a saddle-shape. The residual strains of the middle position in the upper and lower rows are the greatest, with a value of 0.38 mm; and the middle position in the left and right columns are the smallest, with a value of 0.33 mm. The creep strain increases the angular displacement and rate in the pitch and yaw directions of the rocket axis.

为了预测多管火箭系统（MLRS）复合材料导向器在实际环境中的长期存储能力（LTSC），建立了三维非线性形式的蠕变本构模型，通过引入水分来考虑水分效应。将与吸湿率 (MA) 相关的移位因子转移到非线性 Schapery 方程中。将积分形式的本构模型转化为增量迭代形式，实现数值有限元求解。对 E-glass/6509 环氧树脂层压板进行准静态实验和短期蠕变恢复测试，以获得与湿度和应力相关的参数。建立了水分扩散-非线性蠕变多物理场耦合数值模型，并预测了复合材料在储存过程中的MA过程和蠕变变形。通过建立火箭-导向器耦合发射动力学模型，进一步研究了蠕变应变对火箭发射的影响规律。结果表明，在温度30℃、相对湿度70%RH的环境下，存放1年后，水分向导向器内表面扩散，存放8年后，MA达到饱和状态。20个导向器中的最大残余应变（RS）位于第2和第3定位安装环之间，其分布呈马鞍形。上下两排中间位置的残余应变最大，值为0.38 mm；左右两列中间位置最小，值为0.33毫米。