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Effects of Delamination on Higher Harmonics Generation in Unidirectional GFRP Laminate

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Advances in Non Destructive Evaluation (NDE 2020)

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

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Abstract

Wave-based damage detection of composite laminate has been a topic of significant interest for many researchers. Conventional wave damage interaction relies on the baseline approach (i.e., linear Lamb wave technique resulting in wave amplitude, wave velocity, reflection, transmission, and mode conversion). The techniques based on the nonlinear Lamb wave damage interactions have attracted significant attention in recent years. Past investigations have dealt predominantly with classical nonlinearity raised from material nonlinearity. However, non-classical nonlinearity has arisen from the contact acoustic interaction between the delamination surfaces. Delamination is the most predominant mode of failure in laminated composites. Lamb wave excitation with delamination generates higher harmonics to be used as a feasible damage indicator. Toward this, a numerical method dealing with nonlinear interactions of fundamental anti-symmetric Lamb mode with single and multiple delaminations in an eight-layer GFRP-laminated composite plate is investigated using ANSYS. The effective nonlinear Lamb wave parameters (nonlinearity index) are extracted to characterize the effects of multiple delaminations. Further, the effect of overlapping delaminations on the nonlinearity index is also analyzed. The study suggests that the nonlinearity index increases due to the increment in the overlap between two delaminations.

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Acknowledgements

The authors wish to acknowledge the financial support from the Science and Engineering Research Board (SERB), India under grant agreement No: ECR/2017/001171.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Akhilendra Singh Gangwar, Yamnesh Agrawal & Dhanashri M. Joglekar

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  1. Akhilendra Singh Gangwar
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  2. Yamnesh Agrawal
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  3. Dhanashri M. Joglekar
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Corresponding author

Correspondence to Dhanashri M. Joglekar .

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Editors and Affiliations

  1. Azeriri Pvt Ltd and Teralumen Solutions Pvt Ltd, Chennai, India

    Shyamsunder Mandayam

  2. National Metallurgical Laboratory, CSIR, Jamshedpur, India

    Sarmishtha Palit Sagar

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© 2022 Indian Society for Non-destructive Testing

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Gangwar, A.S., Agrawal, Y., Joglekar, D.M. (2022). Effects of Delamination on Higher Harmonics Generation in Unidirectional GFRP Laminate. 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_34

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  • DOI: https://doi.org/10.1007/978-981-16-9093-8_34

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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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