基于化学流变学的复合材料液态模塑成型过程的灵敏度分析

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。

Sensitivity analysis of liquid composite molding processes based on chemorheology

In the view of investigating the sensitive degree of filling time and resin flow front shape to the material and processing parameters during liquid composite molding (LCM) processes, the sensitivity analysis method was introduced to study the resin infiltration process, in which both edge effect and curing reaction were considered. The mathematical relationships of the key physical parameters such as fluid pressure sensitivity and flow rate sensitivity were deduced, and then the filling time sensitivity equation and resin flow front shape sensitivity equation that represents the probability of defects formation were also established. Finally, the coupling method for calculating various parameters and the technical route of sensitivity analysis were designed. On these bases, a simulation program was self-developed to analyze the influencing degree of the key material and processing parameters on the development of resin flow patterns. The simulation results show that under constant injection pressure conditions, elevating the resin injection temperature is the most effective method to raise the production efficiency, and the decrease of edge permeability is the best way to improve the resin flow front shape and the resin infiltration result.