In Resin Transfer Molding (RTM) a dry fibrous reinforcement is placed in a mold and a thermosetting resin system is then injected. Ever faster curing resins have been developed to minimize cycle times. For a thorough process design, the time- and temperature-dependent viscosity behavior needs to be known. However, the short curing times of sometimes less than 2 min often exceed the limitations of conventional measurement approaches. Necessary mixing, application and adjustment procedures lead to a “blind spot” especially at the particularly critical beginning of the reaction. This paper presents a specifically RTM-related concept for the viscosity characterization from mixing until gel point. It is based on generating a linear resin flow in a reference porous media and applying an algorithm based on Darcy's law. The overall approach and the algorithm are presented. The basic functionality is proven by using numerical simulation.

在树脂传递模塑(RTM) 中，将干燥的纤维增强材料放入模具中，然后注入热固性树脂系统。已经开发出更快的固化树脂以最大限度地减少循环时间。对于彻底的工艺设计，需要了解与时间和温度相关的粘度行为。然而，有时不到 2 分钟的短固化时间往往超出了传统测量方法的局限性。必要的混合、应用和调整程序会导致“盲点”，尤其是在反应特别关键的开始阶段。本文提出了一个特定的 RTM 相关概念，用于从混合到凝胶点的粘度表征。它基于生成线性树脂在参考多孔介质中的流动并应用基于达西定律的算法。介绍了总体方法和算法。通过使用数值模拟来证明基本功能。