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Structural health monitoring in riveted lap joints - a simple structure with significant challenges

: Boller, C.; Mofakhami, M.R.

Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren -IZFP-, Institutsteil Dresden; Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin:
4th Dresden Airport Seminar 2008. Structural Health Monitoring (SHM) and its Resources. CD-ROM : 05./06.11.2008, Dresden
Berlin: DGZfP, 2008
43 Folien
Dresden Airport Seminar "Structural Health Monitoring (SHM) and its Resources" <4, 2008, Dresden>
Fraunhofer IZFP ()
structural health monitoring; SHM; damage identification

Since the Aloha Airlines accident in 1988 damage monitoring has received specific additional attention with aircraft structures. Lap joints either riveted or bonded have become a matter of focal interest. In parallel the topic of structural health monitoring (SHM) emerged during that time, mainly triggered by upcoming smart structures activities during the late 1980ies. Since this time a lot of research work has been done in SHM which has allowed the sensitivity of different monitoring techniques to be better understood. However there is currently still no seriously marketable SHM solution to be seen around so far. A major reason for this is possibly the fact that fundamentals in SHM having been elaborated, such as acoustic waves travelling in plates with a hole and/or a crack, are by far not sufficient to be applied for what might be considered to be a simple but real structural component such as a riveted joint. The presentation will start with those fundamentals and will then further move into gradually enhancing structural complexity by limiting the boundaries of a plate, allowing cracks to grow from the holes, filling the holes and finally ending up with a lapped riveted joint. Based on these results SHM-related procedures for reliably monitoring cracks in damage tolerant structures will then be discussed.