Nonlinear Inspection Using Phased Arrays

使用相控阵进行非线性检测

基本信息

批准号：
EP/M022528/1
负责人：
Anthony Croxford
金额：
$ 99.05万
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2015
资助国家：
英国
起止时间：
2015 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FM022528%2F1
关键词：
Nonlinear Inspection Using Phased Arrays

项目摘要

Ageing infrastructure and the move towards more advanced materials raises new, currently unsolved, inspection challenges. Fatigue and creep damage are two of the most common modes of failure in engineering structures, yet both are extremely difficult to detect in early stages of development. Similarly, there is a growing need to inspect bonded joints, be it adhesively bonded composites for major engineering components, or diffusion bonded metal components such as super-plastically deformed fan blades. This lack of inspection technique is artificially limiting the lifetimes and use of engineering components and was recently highlighted as a key requirement on the 5-10 year horizon by a group of industrial end-users of Non-Destructive Evaluation (NDE). They specifically highlighted the need for ``techniques identified for crack precursors, difficult and new engineering materials''.This fellowship will enable the applicant to develop practical and deployable nonlinear ultrasonic inspection techniques for monitoring of each of these damage scenarios, making use of recent developments in ultrasonic equipment, specifically highly flexible phased array systems and novel experimental techniques. The use of phased arrays, which are specifically tailored for NDE, is key. They allow multiple measurements without sensor repositioning, eliminating the high coupling and alignment variability that can readily mask the extremely small nonlinear signals. Even more importantly, the approach in this fellowship will enable localisation of nonlinearity within a specimen. This is currently not possible with any degree of reliability and represents a key barrier to wider adoption of this exciting inspection approach.

老化的基础设施和朝着更先进的材料迈进的转变会引起新的，目前尚未解决的检查挑战。疲劳和蠕变损伤是工程结构中最常见的两种失败模式，但两者在开发的早期阶段都难以检测。同样，越来越需要检查键合接头，无论是用于主要工程组件的粘合键合复合材料还是扩散键合的金属组件，例如超层状变形的风扇叶片。这种缺乏检查技术是人为地限制了工程组件的生命和使用，最近被一组非破坏性评估（NDE）的工业最终用户在5 - 10年的视野中被强调为5 - 10年的关键要求。他们特别强调了需要``针对裂纹前体，困难和新工程材料'确定的技术'。该奖学金将使申请人能够开发可实用的，可部署的非线性超声检查技术，以监视这些损害方案中的每一个，并使用这些损害方案超声设备的开发，特别是高度灵活的分阶段阵列系统和新颖的实验技术。专门针对NDE量身定制的分阶段阵列是关键。它们允许多次测量，而无需传感器重新定位，从而消除了很容易掩盖极小非线性信号的高耦合和对齐变化。更重要的是，该奖学金的方法将使标本中的非线性定位。目前，这种可靠性是不可能的，这代表了更广泛采用这种令人兴奋的检查方法的关键障碍。