Enhanced Ultrasonic 3D Characterisation Of Composites Using Full Matrix Capture Of Array Data

使用阵列数据的全矩阵捕获增强复合材料的超声波 3D 表征

• 批准号: EP/H010920/1
• 负责人: Paul Wilcox
• 金额: $ 28.56万
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH010920%2F1
• 关键词: Enhanced; Ultrasonic; 3D; Characterisation; Composites

Recent years have seen increasing interest in the use of thick-section composites for safety-critical components in, for example, primary aircraft structure and fan blades in aero engines. All such components are required to undergo non-destructive evaluation (NDE) during manufacture; this is time consuming and NDE throughput is stretched to its limit internationally. Current composite Non-destructive Evaluation (NDE) is based on a qualitative empirical approach where a single normal-incidence ultrasonic probe is used to estimate the average ultrasonic attenuation from the amplitude of the back-wall reflection. While adequate for accepting or rejecting thin composite panels, this approach does not provide the level of defect characterisation and localisation necessary for the quantitative NDE of larger components.There is a clear and pressing industrial need for quantitative NDE techniques that can be applied to safety-critical composite components both at manufacture and in-service. An ultrasonic technique is the industrially preferred option for reasons of cost, safety and ease of deployment, but increased scanning speeds are required to speed up throughput. However, the conflicting demands of rapid scanning, high-penetration depth and accurate defect characterisation cannot be achieved with a single normal-incidence probe. Instead the data from multiple inspection directions must be combined. The necessary raw data can be rapidly and efficiently obtained using an ultrasonic array, but at present it cannot be exploited. This is due to the lack of (a) an appropriate forward model of oblique wave propagation and scattering processes, and (b) a suitable inversion scheme to turn the raw data into useful information. This is the motivation for the proposed research programme, the aim of which is to develop ultrasonic array data processing techniques based on physical reasoning for the characterisation of safety-critical aerospace composites. The programme requires advancement of the fundamental science of wave phenomena in composites, the solution of a challenging inverse problem and, crucially, the translation of the scientific findings into practical industrial solutions.

近年来，人们对使用厚截面复合材料制造安全关键部件越来越感兴趣，例如飞机的主要结构和航空发动机的风扇叶片。所有此类部件在制造过程中都需要经过无损评估（NDE）；这非常耗时，而且 NDE 吞吐量在国际上已达到极限。当前的复合无损评估 (NDE) 基于定性经验方法，其中使用单个法线入射超声波探头根据后壁反射的幅度来估计平均超声波衰减。虽然这种方法足以接受或拒绝薄复合材料面板，但无法提供大型部件定量 NDE 所需的缺陷表征和定位水平。工业界对可应用于制造和使用中的安全关键复合材料部件的定量 NDE 技术存在明确而紧迫的需求。出于成本、安全性和易于部署的原因，超声波技术是工业上的首选选择，但需要提高扫描速度来加快吞吐量。然而，快速扫描、高穿透深度和准确的缺陷表征这三个相互矛盾的需求无法通过单个法向入射探头来实现。相反，必须合并来自多个检查方向的数据。使用超声波阵列可以快速有效地获得必要的原始数据，但目前还无法利用。这是由于缺乏（a）适当的斜波传播和散射过程的正演模型，以及（b）适当的反演方案将原始数据转化为有用的信息。这是拟议研究计划的动机，其目的是开发基于物理推理的超声波阵列数据处理技术，以表征安全关键的航空航天复合材料。该计划需要推进复合材料中波动现象的基础科学，解决具有挑战性的反问题，最重要的是，将科学发现转化为实际的工业解决方案。