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, Volume 11, Issue 1, pp 48–53 | Cite as

Eddy current testing in CFRP production

  • Georg Bardl
  • Richard Kupke
  • Henning Heuer
  • Chokri Cherif
Production Quality Assurance
  • 312 Downloads

Eddy current testing has established itself as a nondestructive test method in CFRP production. By exploiting the electrical conductivity of carbon fibers, it is possible to detect fiber orientation, surface weight, area density and fiber volume content as well as ripples and folds in stacks, preforms and composite components. This article presents recent applications and discusses future perspectives for deployment in CFRP production.

Forming Multi-layer Semifinished Products

Nondestructive testing of multi-layer stacks, preforms and composite components for correct fiber orientation and freedom from defects is a recurrent task in CFRP production. The shearing of textile materials that results when flat semifinished products are draped into multi-curved 3-D geometries, changes local fiber orientation and hence the rigidity of the composite components. What is more, areas with extreme shearing also increase fiber volume content and are prone to the formation of folds and dry spots that...

Notes

Thanks

The work on 3-D fiber orientation detection described here is part of the “3-D Fast” project that is funded by the European Regional Development Fund (ERDF) and the Free State of Saxony (funding code 100224749). The authors would like to thank the aforementioned institutions for the provision of financial resources. Parts of the findings represented here are based on work performed by Martin Schulze and Matthias Pooch (Fraunhofer IKTS) and Matthias Hübner and Andreas Nocke (TU Dresden), whom the authors wish to thank for kindly making them available.

References

  1. [1]
    Nezami, F. N.: Automatisiertes Preforming von Kohlefaserhalbzeugen mit aktiven Materialführungssystemen zur Herstellung komplexer Faserverbundstrukturen. (Automated preforming of carbon-fiber semifinished products with active material guidance systems for the production of complex fiber composite structures.) Dissertation, TU Dresden, Faculty of Mechanical Science and engineering, 2015Google Scholar
  2. [2]
    Owston, C. N.: Eddy current methods for the examination of carbon-fibre-reinforced epoxy resins. In: Materials Evaluation 34 (1976), pp. 37–244Google Scholar
  3. [3]
    Schulze, M. H.; Heuer, H.; Küttner, M.; Meyendorf, N.: High-resolution eddy current sensor system for quality assessment of carbon-fiber materials. In: Microsystem Technologies 16 (2010), No. 5, pp. 791–797CrossRefGoogle Scholar
  4. [4]
    Bardl, G.; Nocke, A.; Cherif, C.; Pooch, M.; Schulze, M.; Heuer, H.; Schiller, M.; Kupke, R.; Klein, M.: Automated detection of yarn orientation in 3-D-draped carbon-fiber fabrics and preforms from eddy current data. In: Composites Part B: Engineering 96 (2016), pp. 312–324CrossRefGoogle Scholar
  5. [5]
    Mizukami, K.; Mizutani, Y.; Todoroki, A.; Suzuki, Y.: Detection of in-plane and out-of-plane fiber waviness in unidirectional carbon-fiber-reinforced composites using eddy current testing. In: Composites Part B: Engineering 86 (2016), pp. 84–94CrossRefGoogle Scholar
  6. [6]
    Heuer, H.; Schulze, M.; Pooch, M.; Gäbler, S.; et al.: Review on quality assurance along the CFRP value chain — Non-destructive testing of fabrics, preforms and CFRP by HF radio wave techniques. In: Composites Part B: Engineering 77 (2015), pp. 494–501CrossRefGoogle Scholar
  7. [7]
    Gäbler, S.: Untersuchung des Anwendungspotenzials der Hochfrequenzwirbelstrommesstechnik zur Charakterisierung dielektrischer Eigenschaften von Epoxidharzen und Faserverbundmaterialien. Dissertation, TU Dresden, Faculty of Electrical EngineeringGoogle Scholar

Copyright information

© Springer Fachmedien Wiesbaden 2018

Authors and Affiliations

  • Georg Bardl
    • 1
  • Richard Kupke
    • 2
  • Henning Heuer
    • 3
  • Chokri Cherif
    • 1
  1. 1.TU DresdenGermany
  2. 2.Suragus GmbHDresdenGermany
  3. 3.Fraunhofer Institute for Ceramic Technologies and Systems (IKTS)DresdenGermany

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