Local Metal Hybridization of Composite Bolted Joints

  • Axel Fink
Part of the Research Topics in Aerospace book series (RTA)


Composite technologies have been proven to be advantageous in allowing for the development of aircraft and spacecraft structures which feature highly integral design concepts. However, structural joining using conventional mechanical fastening techniques still remains an indispensable issue within the design of advanced composite structures. Crucial challenges facing structural joining are the inherent complexity of the stress state at the bolt locations on the one hand and the multifaceted fracture mechanics of composite material on the other. The aerospace industry’s increasing requirement for weight reductions and a more efficient use of composites demands not only an accurate understanding of this material’s mechanics and its damage behavior at composite joints but the development of advanced joining techniques as well in order to be able to fully exploit the outstanding capabilities of composite material. The use of a local hybridization with metal represents a suitable and technologically feasible means to increase the mechanical efficiency of highly loaded composite bolted joints which allows for a significant improvement of the overall structural efficiency of real composite structures. This chapter presents the hybrid reinforcement concept and addresses some fundamental topics of this technology’s mechanical behavior.


Composite Laminate Residual Strength Joint Strength Joint Efficiency Local Hybridization 
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  1. 1.
    Raju, I., Glaessgen, E., Mason, B., Krishnamurthy, T., Davila, C.: NASA Structural analysis report on the American airlines flight 587 Accident—Local Analysis of the Right Rear Lug. AIAA Paper 2005–2255, NASA Langley Research Center (2005)Google Scholar
  2. 2.
    Gründer, M.: Risse im Blech. Flugrevue 6(2011), 88–89 (2011)Google Scholar
  3. 3.
    Woytowich, R.: Riveted hull joint design in RMS titanic and other pre-world war I ships. Mar. Technol. 40, 82–92 (2003)Google Scholar
  4. 4.
    Vlot, A., Gunnik, W.: Fibre metal laminates, an introduction. Kluwer Academic Publishers, Dordrecht (2001)CrossRefGoogle Scholar
  5. 5.
    Johnson, W.S., Cobb, T.: Hybrid titanium composite laminates: a new aerospace material. In: 21st Annual Adhesion Society Meeting, NASA Langley Research Center (1998)Google Scholar
  6. 6.
    Schijve, J.: Fatigue of structures and materials. Springer, Berlin (2009)CrossRefGoogle Scholar
  7. 7.
    Fink, A., Camanho, P.: Reinforcement of composite bolted joints by means of local metal hybridization. In: Composite Joints and Connections, Woodhead Publishing Ltd. (2011)Google Scholar
  8. 8.
    Camanho, P., Fink, A., Obst, A., Pimenta, S.: Hybrid titanium-CFRP laminates for high performance bolted joints. Compos. A 40, 1826–1837 (2009)CrossRefGoogle Scholar
  9. 9.
    Fink, A., Kolesnikov, B., Herbeck, L.: Effizienzsteigerung von Hochleistungsfaserverbundstrukturen durch lokale CFK/Metall Verstärkung, Deutscher Luft- und Raumfahrtkongress DGLR, Braunschweig, Nov. 2006 (2006)Google Scholar
  10. 10.
    Kolesnikov, B., Herbeck, L., Fink, A.: CFRP/Titanium hybrid material for improving composite bolted joints. Compos. Struct. 83, 368–380 (2008)CrossRefGoogle Scholar
  11. 11.
    Fink, A.: Lokale Metall-Hybridisierung zur Effizienzsteigerung von Hochlastfügestellen in FAserverbundstrukturen, DLR Forschungsbericht 2010–2014 (2010)Google Scholar
  12. 12.
    Fink, A., DuMars, B. Development of an improved surface preparation for titanium bonding and titanium graphite laminates for aircraft and space vehicle applications. AIRTEC 5th International Conference, Frankfurt (2010)Google Scholar
  13. 13.
    Fink, A., Camanho, P., Andrés, J.M., Pfeiffer, E., Obst, A.: Hybrid CFRP/titanium bolted joints: performance assessment and application to a payload adaptor. Compos. Sci. Technol. 70, 305–317 (2010)CrossRefGoogle Scholar
  14. 14.
    Fink, A., Camanho, P., Canay, M., Obst, A.: Increase of bolted joint performance by means of local laminate hybridization. In: 1st CEAS European Air and Space Conference, Berlin (2007)Google Scholar
  15. 15.
    Fink, A., Camanho, P., Andrés, J.M., Pfeiffer, E., Obst, A.: CFRP/metal hybrid material for improving composite bolted joints. In: 11th European Conference on Spacecraft Structures, Materials and Mechanical Testing, Toulouse (2009)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Institute of Composite Structures and Adaptive SystemsGerman Aerospace, Center (DLR e.V.)BraunschweigGermany

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