Print Email Facebook Twitter Detection and Evaluation of Pre-Preg Gaps and Overlaps in Glare Laminates Title Detection and Evaluation of Pre-Preg Gaps and Overlaps in Glare Laminates Author Nardi, D. (TU Delft Aerospace Manufacturing Technologies) Abouhamzeh, M. (TU Delft Structural Integrity & Composites) Leonard, R.A. (TU Delft Structural Integrity & Composites) Sinke, J. (TU Delft Structural Integrity & Composites) Date 2018-03 Abstract Gaps and overlaps between pre-preg plies represent common flaws in composite materials that can be introduced easily in an automated fibre placement manufacturing process and are potentially detrimental for the mechanical performances of the final laminates. Whereas gaps and overlaps have been addressed for full composite material, the topic has not been extended to a hybrid composite material such as Glare, a member of the family of Fibre Metal Laminates (FMLs). In this paper/research, the manufacturing, the detection, and the optical evaluation of intraply gaps and overlaps in Glare laminates are investigated. As part of an initial assessment study on the effect of gaps and overlaps on Glare, only the most critical lay-up has been considered. The experimental investigation started with the manufacturing of specimens having gaps and overlaps with different widths, followed by a non-destructive ultrasonic-inspection. An optical evaluation of the gaps and overlaps was performed by means of microscope image analysis of the cross sections of the specimens. The results from the non-destructive evaluations show the effectiveness of the ultrasonic detection of gaps and overlaps both in position, shape, width, and severity. The optical inspections confirm the accuracy of the non-destructive evaluation also adding useful insights about the geometrical features due to the presence of gaps and overlaps in the final Glare laminates. All the results justify the need for a further investigation on the effect of gaps and overlaps on the mechanical properties. Subject Defect onsetFibre metal laminatesGaps and overlapsOptical inspectionUltrasonic non-destructive evaluation To reference this document use: http://resolver.tudelft.nl/uuid:0a4b8909-a6e0-4849-ac15-a770a9b37941 DOI https://doi.org/10.1007/s10443-018-9679-z ISSN 0929-189X Source Applied Composite Materials: an international journal for the science and application of composite materials, 1-17 Part of collection Institutional Repository Document type journal article Rights © 2018 D. Nardi, M. Abouhamzeh, R.A. Leonard, J. Sinke Files PDF 10.1007_s10443_018_9679_z.pdf 3.57 MB Close viewer /islandora/object/uuid%3A0a4b8909-a6e0-4849-ac15-a770a9b37941/datastream/OBJ/view