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为了探讨复合材料液态模塑成型(LCM)过程中充填时间和树脂流动前锋形状对材料参数及工艺参数的敏感程度,考虑树脂非稳态浸润过程中的边缘效应以及固化反应现象,引入灵敏度分析方法,推导了模腔内流体压力灵敏度和流体速度灵敏度等关键物理量参数之间所满足的数学关系,构建了充填时间灵敏度方程以及表征材料浸润缺陷形成可能性的树脂流动前锋形状函数及其灵敏度方程,并设计了各物理量的耦合求解方法及灵敏度分析的技术路线。在此基础上,自主开发了数值模拟软件,数值分析了关键材料和工艺参数对树脂流场发展的影响规律和程度。模拟结果表明,在恒压注射边界条件下,提高流体注射温度是提高生产效率最有效的方法,减少边缘区域渗透率则是最能改善树脂流动前锋形状以及充填浸润效果的途径。
In order to investigate the filling time and resin flow forward shape of composites, the sensitivities of materials to the material parameters and process parameters were investigated. The edge effect and the curing reaction in the unsteady wetting process of resin were considered. Sensitivity analysis , The mathematical relationships between the key physical parameters such as fluid pressure sensitivity and fluid velocity sensitivity in the cavity are deduced. The filling time sensitivity equation and the shape function of resin flow front and its sensitivity equation are constructed, which can represent the possibility of material infiltration defects formation. And the coupling method of solving each physical quantity and the technical route of sensitivity analysis are designed. On this basis, numerical simulation software was developed independently to analyze the rules and extent of the influence of key materials and process parameters on the development of resin flow field. The simulation results show that increasing the fluid injection temperature is the most effective way to increase the production efficiency under the constant pressure injection boundary conditions. Reducing the permeability in the marginal zone is the most effective way to improve the shape of the resin flow front and the infiltration effect.