Non-Destructive Evaluation of Aerospace Composites at the Manufacturing Stage

传统上，无损评估（NDE）是在航空航天领域碳纤维增强聚合物（CFRP）的制造后阶段进行的，如果发现成品部件存在缺陷，则对其进行修复/报废（刮擦）。然而，通过在中间工艺阶段部署NDE获得的半成品组件知识将允许检测缺陷来源并采取原位纠正工艺调整步骤，例如纤维编织，织物铺设，树脂注入等的参数优化。这可以防止在制造有缺陷的航空航天部件上花费时间和成本，这些部件通常尺寸很大，由相当多的原材料组成。鉴于不同无损检测模式的优缺点，本EngD项目旨在：a)研究工业合作伙伴（Spirit AeroSystems）的典型CFRP产品的制造；b)确定常见工艺缺陷类型、位置和大小的性质；c)通过建模和实验的比较研究，调查不同无损检测模式在每个制造阶段的优势和缺点；d)提供可能的创新改变无损检测模式，部署；以及用于提高每个阶段检测性能的传感器

Traditionally, Non-Destructive Evaluations (NDE) is deployed at post-manufacturing stage of Carbon Fiber Reinforced Polymers (CFRP) in aerospace where the finished components are repaired/rejected (scraped) if they are found to have defects. However, a knowledge of semi-finished components gained through deployment of NDE at intermediate process stages would allow detection of the source of defects and taking in-situ corrective process adjustment steps, such as parameters refinement for fiber weaving, fabric lay-up, resin infusion, etc. This prevents expenditure of time and costs on manufacturing of flawed aerospace components which are typically very large in size and made up of a considerable amount of raw material.In view of the strengths and weaknesses of different NDE modalities, this EngD project aims to:a) Study the manufacturing of typical CFRP products of the industrial partner (Spirit AeroSystems)b) Identify the nature of common process defect types, location, and size, c) Investigate the strengths and shortcomings of different NDE modalities for each manufacturing stage in a comparative study through modelling and experimentsd) Provide possible innovative alteration of NDE modality, deployment, and sensors for improved detection performance at each stage