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Evaluation of Mode II Delamination Area by Non-destructive Techniques: Accuracy and Influence on Fracture Toughness Calculation

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Abstract

The present work estimated the accuracy of non-destructive tests in quantifying the delaminated area in CFRP samples submitted to a 4-point end notched flexure test, to evaluate the relevance of measuring the delamination area to calculate fracture toughness in mode II, instead of of the traditional method which evaluates the delamination length visually through the sample lateral faces. In this way, IR thermography, eddy current, ultrasonic microscopy, and X-ray computed microtomography (as reference) tests were employed. A methodological sequence based on image processing algorithms was performed to calculate the values of the delaminated areas for all NDT techniques. The first two techniques did not provide a clear separation between the defective and intact zones and are strongly influenced by edge effects. The result is different for the two last tests, which demonstrated a satisfactory definition of the delamination limit region. The ultrasonic microscopy test revealed results similar to microtomography, proving to be a promising alternative for this type of measurement. In addition, the importance of using more accurate methods in calculating the crack length is emphasized, as the traditional visual measurement can be highly susceptible to errors and does not allow evaluating potential tunneling effects or an uneven delamination front.

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Acknowledgements

The authors would like to acknowledge Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ) and Deutscher Akademischer Austauschdienst (DAAD) for the financial support and enable the academic partnership between Federal University of Rio de Janeiro, Technische Universität Dresden (TU Dresden) and the Fraunhofer-Institut für Keramische Technologien und Systeme (Fraunhofer IKTS Institute). The authors also thank Juan E. Perez Ipiña (Consejo Nacional de Investigaciones Científicas y Técnicas—CONICET) and INVAP SE for supplied the material.

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Authors and Affiliations

  1. Non-Destructive Testing, Corrosion and Welding Laboratory- LNDC (Poli/COPPE), Federal University of Rio de Janeiro, Av. Pedro Calmon s/n, Rio de Janeiro, 21941-596, Brazil

    Daniel Scandiuzzi Valença de Castro, Marcella Grosso & Cesar Giron Camerini

  2. Laboratory of Composite Materials -LaCom (Poli/COPPE), Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos 149, I-222, Rio de Janeiro, 21941-909, Brazil

    Hector Guillermo Kotik

  3. Institute for Electronic Packaging and Assembly, Technische Universität Dresden, 01069, Dresden, Germany

    Nataliia Matvieieva & Henning Heuer

  4. Department for Material Diagostics, Fraunhofer IKTS, Maria-Reiche Straße 2, 01109, Dresden, Germany

    Henning Heuer

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  1. Daniel Scandiuzzi Valença de Castro
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Correspondence to Daniel Scandiuzzi Valença de Castro.

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de Castro, D.S.V., Matvieieva, N., Grosso, M. et al. Evaluation of Mode II Delamination Area by Non-destructive Techniques: Accuracy and Influence on Fracture Toughness Calculation. J Nondestruct Eval 40, 58 (2021). https://doi.org/10.1007/s10921-021-00789-3

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