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A new approach to assess delamination in drilling carbon fibre-reinforced epoxy composite materials

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Abstract

The development of efficient, high-quality joining techniques is still considered an obstacle to the wide application of composite materials as structural components. Mechanical fastening is one of the most common joining techniques. However, this requires the composite material to be drilled, which introduces significant damage to the material. The improvement of drilling techniques is dependent on the accurate analysis of the induced damage. Moreover, concerning repair activities, the assessment of the machining-induced damage enables the determination of its significance, identifying the immediacy of repair. The delamination factors described in the literature quantify the damage but neither has achieved full acceptance to create international standards, which are yet to be defined. This work proposes a new approach to assess the delamination factor by using an image processing methodology, based on digital radiography, to characterize the drilling-induced damage. This approach reconsiders the assumptions made prior to the application of the delamination factor, by reducing the affected area to a quantified damaged area ratio. The obtained results highlight that the minimization of the quantified damage for the most irregular delamination shapes to a single, unequivocal value creates an unambiguous delamination factor for quantifying drilling-induced damage. Simultaneously, the preferential direction of the damage is identified. Additionally, since it is a fully automated method, it is an expeditious method that can be used in situ, being valuable either for manufacturing or repair activities.

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Funding

This project was financial supported by the Fundação para a Ciência e a Tecnologia (FCT - MCTES) through UIDB/00667/2020 (UNIDEMI).

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Authors and Affiliations

  1. UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal

    Carla Moreira Machado, Catarina Vidal, Bruno Soares & Jorge Pamies Teixeira

  2. Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal

    Duarte Silva

Authors
  1. Carla Moreira Machado
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  2. Duarte Silva
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  3. Catarina Vidal
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  4. Bruno Soares
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  5. Jorge Pamies Teixeira
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Contributions

Carla Moreira Machado: experimental work, formal analysis, data selection, and writing original draft. Duarte Silva: methodology and experimental work. Catarina Vidal: writing, review, and editing. Bruno Soares: writing, review, and editing. Jorge Pamies Teixeira: conceptualization and supervision.

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Correspondence to Catarina Vidal.

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Machado, C.M., Silva, D., Vidal, C. et al. A new approach to assess delamination in drilling carbon fibre-reinforced epoxy composite materials. Int J Adv Manuf Technol 112, 3389–3398 (2021). https://doi.org/10.1007/s00170-021-06636-z

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  • DOI: https://doi.org/10.1007/s00170-021-06636-z

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