A novel non-linear elastic wave acoustic spectroscopy (NEWS) non-destructive inspection (NDI) method for aeronautic and spacecraft materials and components

详细信息    查看全文

• 作者：D. W. Robinson ; J. Wright ; S. Gupta ; T. Mottram ; P. Armitage…
• 关键词：Non ; destructive inspection ; Non ; destructive testing ; Composite kissing de ; bond defects ; Non ; linear acoustic spectroscopy ; Space craft testing ; Early ; stage defect detection
• 刊名：CEAS Space Journal
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：8
• 期：1
• 页码：35-45
• 全文大小：2,713 KB
• 参考文献：1.Solodov, I., Busse, G.: Nonlinear air-coupled emission: the signature to reveal and image microdamage in solid materials. Appl. Phys. Lett. 91, 251910 (2007)CrossRef
  2.Wright, J.R., Armitage, P.R., Mottram, T.D.: Non-linear acoustics techniques for NDT. British Institute NDT conference, 2013
  3.Armitage, P.R.: New ultrasonic methods for detecting damage in metals and composite materials. Ph.D. thesis, University of Exeter (2009)
  
• 作者单位：D. W. Robinson (1)
  J. Wright (2)
  S. Gupta (2)
  T. Mottram (2)
  P. Armitage (2)
  M. Gower (3)
  M. Lodeiro (3)
  P. Gelat (3)
  C. Schwarz (4)
  
  1. Psi-tran Ltd, Sunbury on Thames, London, TW165AR, UK
  2. Theta Technologies Ltd, The Innovation Centre, University of Exeter, Rennes Drive, Exeter, Devon, EX4 4RN, UK
  3. National Physical Laboratory (NPL), Hampton Road, Teddington, Middx, TW11 0LW, UK
  4. ESA-ESTEC, Keplerlaan 1, PO Box 299, 2200 AG, Noordwijk, The Netherlands
  
• 刊物类别：Engineering
• 出版者：Springer Wien
• ISSN：1868-2510

文摘

Current non-destructive inspection (NDI) methods have limitations in their ability to identify certain flaws in complex materials and structures where a defect has not been fully formed, for example a kissing de-bond early-stage defect. Non-linear elastic wave acoustic spectroscopy (NEWS) methods have shown potential to detect early-stage flaws in metals and composites. The objectives of the ESA study reported here were to review the state of the art, then to design and build a breadboard demonstrator “NEWS Imaging” (NEWSI) non-linear acoustics instrument, and finally to demonstrate its capability using well-characterised reference defect artefacts (RDAs). A multi-mode NEWSI instrument was produced with the following modes of operation: (a) single and dual frequency, (b) pulse inversion, and (c) resonance drift modes. The first two are suitable for C-scan style imaging by contact testing or with the NACE (air-coupled detection) mode. A set of RDAs were sourced or manufactured, the most important of which was the development of successful kissing de-bonds; areas of significantly reduced bond strength, created in the bond-line between the composite laminates. All the RDAs were characterised by a wide range of complementary NDI methods, and the best results in terms of detection of all the known flaws was the scanning acoustic microscopy ultrasonic C-scan method. This technique detected all of the RDA defects except for kissing de-bonds. The NEWSI instrument was shown to be capable of detecting, with a certain degree of repeatability under controlled conditions, early-stage defects (kissing de-bonds) in composite materials. No other NDI method is known to detect these defect types. The results so far are encouraging and have potentially a lot of interest for ESA and the wider industry, if the unique capabilities of the NEWSI instrument demonstrated on the kissing de-bonds could be developed into a “routine practical test instrument”. The target of the next stage of work is to bring the technology readiness level of the instrument up to pre-production levels of development. Keywords Non-destructive inspection Non-destructive testing Composite kissing de-bond defects Non-linear acoustic spectroscopy Space craft testing Early-stage defect detection