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- Title
Experimental analysis of damage propagation in riveted CFRP-steel structures by thermal loads.
- Authors
Wagner, Julia; Wilhelm, Maximilian; Baier, Horst; Füssel, Uwe; Richter, Thomas
- 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.
- Subjects
CARBON fiber-reinforced plastics; STEEL; MECHANICAL loads; THERMAL expansion; ULTRASONICS; BLIND rivets; DISPLACEMENT (Mechanics)
- Publication
International Journal of Advanced Manufacturing Technology, 2014, Vol 75, Issue 5-8, p1103
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-014-6197-5