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Experimental analysis of damage propagation in riveted CFRP-steel structures by thermal loads

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Abstract

This paper focuses on the description of damage propagation around rivets in multiple joined single lap carbon fiber reinforced plastics (CFRP)-steel structures due to loads as a consequence of different coefficients of thermal expansion. Materials and rivets were chosen according to automotive body shop applications. Specimens were evaluated non-destructively in ultrasonic C-scans to characterize damage behavior of blind and self-piercing rivets in CFRP-steel-connections before and after the application of thermal loads. An algorithm for an automated detection of damage size on ultrasonic C-scan images was developed as the basis for further damage classification. The results show that blind riveting (BR) causes crack-like initial damage that broadens to roundish plane defects due to heating. Initial extensive damage due to self-piercing riveting (SPR) propagates in elliptic shape. Additionally, tension tests revealed a loss in ultimate load by 10–15 % induced by thermal loads and associated with damage propagation. A correlation between initial damage, relative displacement, and thermal loads was observed.

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Authors and Affiliations

  1. Joining Technique Body Shop, BMW Group, Landshuter Str. 56, 84130, Dingolfing, Germany

    Julia Wagner, Maximilian Wilhelm & Thomas Richter

  2. Institute of Lightweight Structures, Technische Universität München, Boltzmannstr. 15, 85748, Garching, Germany

    Horst Baier

  3. Institut für Fertigungstechnik, Professur Fügetechnik und Montage, Technische Universität Dresden, George-Bähr-Str.3c, 01069, Dresden, Germany

    Uwe Füssel

Authors
  1. Julia Wagner
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  2. Maximilian Wilhelm
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  3. Horst Baier
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  4. Uwe Füssel
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  5. Thomas Richter
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Correspondence to Maximilian Wilhelm.

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Wagner, J., Wilhelm, M., Baier, H. et al. Experimental analysis of damage propagation in riveted CFRP-steel structures by thermal loads. Int J Adv Manuf Technol 75, 1103–1113 (2014). https://doi.org/10.1007/s00170-014-6197-5

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  • DOI: https://doi.org/10.1007/s00170-014-6197-5

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