Research Initiation: Dynamic Dielectric Monitoring of In-situ Consolidation of Thermoplastic Filament Winding

该项目将研究现场监测的基本原理 热塑性复合材料在纤维缠绕中的固结 动态介电分析 尽管其表现出 在生产率、成本和工艺灵活性方面的优势， 具有原位固结的热塑性纤维缠绕不 被广泛接受的工业应用，因为 由变化引起的缠绕部分的高空隙含量 在细丝放置点处的合并。 调查 目的在于确定热塑性树脂的固化程度， 通过分析其树脂流变性， 频率相关电磁传感特性 方法论 本研究的独特之处在于 压实过程中的动态介电测量 以提供近场、非破坏性和非侵入式感测 技术，使过程中评估的关键 直接影响零件质量的材料特性 和生产力。 这项工作将形成分析基础， 技术，建立基本的理解， 动态介电参数（即 介电常数、损耗因子和电导率）和原位 整合过程，通过以下方式展示概念的可行性 模拟测试，并探讨的优点和局限性， 该方法通过原型系统的实施， 纤维缠绕站 这项研究的成功完成预计将 消除了纤维缠绕发展中的一个主要障碍 通过建立一个非常需要的过程中的技术 监测方法。 调查还将开启新的 反馈控制和优化研究的机会 先进复合材料智能加工的关键领域。

The project will study the fundamentals of monitoring in-situ consolidation of thermoplastic composites in filament winding based on dynamic dielectric analysis. In spite of its demonstrated advantages in production rate, cost, and process flexibility, thermoplastic filament winding with in-situ consolidation has not been widely accepted for industrial applications because of the high void content of the wound part resulting from the variation of consolidation at the filament lay down point. The investigation aims at identifying the degree of thermoplastic resin consolidation at the lay down point through analyzing its resin rheology properties by frequency-dependent electromagnetic sensing methodology. The uniqueness of the research is the concept of imbedding dynamic dielectric measurement in the compaction process to provide a near-field, non-destructive, and non-intrusive sensing technique which enables the in-process assessment of the critical material properties that directly contribute to the part quality and productivity. The work will formulate the analytical basis of the technique, establish the fundamental understanding of the relationship between dynamic dielectric parameters (namely the permittivity, loss factor and conductivity) and the in-situ consolidation process, demonstrate the concept feasibility through simulation testings, and explore the advantages and limitations of the methodology through prototype system implementation on a filament winding station. The successful completion of this research is expected to remove a major obstacle in the advancement of filament winding technology by the establishment of a much needed in-process monitoring methodology. The investigation will also open up new opportunities for feedback control and optimization research in the critical area of intelligent processing of advanced composites.