Non-Destructive Evaluation of Aerospace Composites at the Manufacturing Stage

传统上，无损评估(NDE)在航空航天碳纤维增强聚合物(CFRP)的制造后阶段进行，在此阶段，如果发现成品部件有缺陷，则对其进行修复/报废(刮擦)。然而，通过在中间工艺阶段部署无损检测获得的半成品部件的知识将允许检测缺陷的来源并采取现场纠正工艺调整步骤，例如纤维编织、织物铺设、树脂注入等的参数细化。这防止了制造有缺陷的航空部件的时间和成本的花费，这些部件通常尺寸非常大，并且由大量的原材料组成。鉴于不同无损检测方式的优缺点，该EngD项目的目的是：a)研究工业伙伴(SPIRIT AeroSystems)的典型CFRP产品的制造b)确定常见工艺缺陷类型的性质，位置和大小，c)通过建模和实验在比较研究中调查每个制造阶段不同无损检测模式的优点和缺点d)为每个阶段的无损检测模式、部署和传感器提供可能的创新更改，以提高检测性能

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