Advanced Polymeric Materials: Process Induced Internal Stresses in Laminated Polymer Composites

本研究旨在发展实验和分析两种方法来确定层压复合材料结构在加工过程中产生的内应力。通过这些内应力表征，将开发出一种方法，可以为控制复合材料的加工和性能提供基本的理解。用连续纤维增强的热固性和热塑性聚合物基体都是电力工业结构材料的潜在候选者，将使用成熟的和新颖的层压工艺进行研究。作为这项研究的一个组成部分，将评价几种过程监测技术；这些技术也可用于在线、长期耐久性监测。内应力分析将在宏观和微观（微机械）尺度上进行研究，同时考虑时间依赖（动力学）和时间独立（热力学）效应。通过实验和分析方法，将尝试表征复合系统的分子和形态结构特征，这些特征会影响和/或在加工过程中产生内应力，从而导致完整的性能表征。预计这项研究的结果，结合以往的发展，将为层压复合材料的工艺分析提供一种基本方法，也可能为在电力工业的实际制造业务中为复合材料的承重结构应用筛选新材料和工艺提供基本信息。

This research is to develop both experimental and analytical methods to determine internal stresses induced in laminated composite structures during processing. Through these internal stress characterizations, a methodology will be developed that can provide a basic understanding for controlled processing and performance of composites. Both thermosetting and thermoplastic polymer matrices reinforced with continuous fibers, that are potential candidates for structural materials in the electric power industry, will be examined using well established as well as novel lamination processes. As an integral part of this study, several process monitoring techniques will be evaluated; these techniques could also be used for on-line, long term durability monitoring. Internal stress analysis will be studied on macroscopic as well as microscopic (micro-mechanical) scale considering both time dependent (kinetic) and time independent (thermodynamic) effects. Through the experimental and analytical approach, an attempt will be made to characterize composite system molecular and morphological structural features that are influenced and/or give rise to the internal stresses developed during processing, leading to full property characterization. It is anticipated that the results derived from this study, in conjunction with previous developments, will provide a basic methodology for process analysis of laminated composites that may also provide fundamental information in screening new materials and processes for load bearing structural application of composites in real manufacturing operations focused on the needs of the electric power industry.