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Real-Time Detection of Defects on a Honeycomb Composite Sandwich Structure Using Digital Image Correlation (DIC)

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Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Digital image correlation (DIC) has been regularly used as a quantitative structural integrity evaluation tool. Gradually, it is emerging as a quantitative NDE (QNDE) tool for many structural engineering applications. Earlier the authors have reported real-time NDE of metallic structures using DIC which detected defects under continuous loading. This paper reports a unique application of DIC wherein debonds on a honeycomb-composite sandwich structure could be detected online and in situ during ground static structural testing with intermittent loading steps. Defect response in terms of local displacement and strain fields at one location on the hardware could be obtained both online and offline as well. However, it is noticed that the sensitivity of the defects depends upon the reference image taken. Further work is in progress to understand this behavior. Nevertheless, this paper demonstrates yet another case study on the simultaneous use of DIC as a structural integrity evaluation tool in tandem with a real-time quantitative NDE (QNDE) tool.

Keywords

  • Defects or flaws
  • DIC
  • Real-time NDT
  • Quantitative NDE (QNDE)
  • Structural integrity
  • Composite sandwich structures

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  • DOI: 10.1007/978-981-16-9093-8_5
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Acknowledgements

The authors wish to acknowledge Shri S. Somanath, Director, VSSC, Shri M. Premdas, Deputy Director/STR, VSSC and Shri N. Shyam Mohan, Group Director/STG, VSSC for their encouragement. The authors thank Mr. S. N. Suresh, Sr. Technician B, EXMD/VSSC for his relentless support during the tests.

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© 2022 Indian Society for Non-destructive Testing

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Swain, D., Selvan, S.K., Thomas, B.P., Philip, J. (2022). Real-Time Detection of Defects on a Honeycomb Composite Sandwich Structure Using Digital Image Correlation (DIC). In: Mandayam, S., Sagar, S.P. (eds) Advances in Non Destructive Evaluation. NDE 2020. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-9093-8_5

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  • DOI: https://doi.org/10.1007/978-981-16-9093-8_5

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-16-9092-1

  • Online ISBN: 978-981-16-9093-8

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