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Quantification of Wall Loss Defect in Glass Fiber Reinforced Polymer Curved Composites Using Lock-In Thermography

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Abstract

GFRP pipes are increasingly used all around the globe mainly because of its high corrosive resistance and light weight properties. GFRP are employed in the industries involving chemical processes, such as, water treatment, desalination and in petrochemical industries for handling oil & gas at offshore platforms. The studies on the reliability of the GFRP pipes and its defect occurring probabilities are widely performed, in which, pitting or wall loss defect is one of the severe defects which may produce in service stage and lead to leakage accidents. This paper explores the potential of lock-in results to quantification of pitting or wall loss defects in unidirectional filament wound GFRP curved composite materials. This work is focusing on quantification of defect depth through thermal diffusion and amplitude contrast methods. For defect sizing Full Width at Half Maximum method (FWHM) has been used. A detailed systematic investigation on defect depth and size quantification at various depths of the unidirectional GFRP curved sample is studied with the amplitude and phase images.

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Acknowledgements

The authors thank Director, Indira Gandhi centre for Atomic Research, Kalpakkam for permitting to use the lock-in thermographic facility. This research received no specific scholarship from any funding agency.

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Authors and Affiliations

  1. Department of Physics, National Institute of Technology, Tiruchirappalli, 620015, India

    R. Gomathi & M. Ashok

  2. Health Safety and Environment Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    M. Menaka & B. Venkatraman

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  1. R. Gomathi
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  2. M. Ashok
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  3. M. Menaka
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  4. B. Venkatraman
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Correspondence to M. Ashok.

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Gomathi, R., Ashok, M., Menaka, M. et al. Quantification of Wall Loss Defect in Glass Fiber Reinforced Polymer Curved Composites Using Lock-In Thermography. J Nondestruct Eval 40, 42 (2021). https://doi.org/10.1007/s10921-021-00774-w

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