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Design of improved sanwich panel joint
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Saab Ericsson space, based in Göteborg, use bonding angles to join sandwich panels together. The study of this design has shown great advantages, in particular its lightweight. But its low tensile load capability (around 1 kN), difficult manufacturing, implementation (time) and strength prediction (no model) does not make it easy to recommend it as the best design possible to use. In fact, this is the skin trough-thickness resistance, which is involved for the design mechanical capability. This one is very low and leads to delamination. From those observations, together with the study of the other existing designs, several concepts have been proposed. The main relevant idea is to use other properties of the sandwich panels. And the most interesting one is the use of the honeycomb core properties, and especially the shear and tensile properties. The use of the honeycomb core implies the use of potting agent. And the most classical design with potting agent is mechanical insert, moreover employed for many others purposes by SE. But the studied design is embedded plate that are bonded from each side to the one panel and embedded in the other. A numerical model has been first established to predict the design capabilities. Then samples have been tested. Their high load (around 10 kN) and the rather good correspondence with the predicted values make it an interesting design for structures where high loads are involved. Nevertheless, the thermally cycled samples show a 22% drop in strength, due to the presence of macroscopic cracks in the potting agent. The main cause of those cracks is supposed to come from the difference in thermal coefficient of expansion between the composite plate and the potting agent. The most interesting solution, not investigated yet, would be to replace the composite plate by a titanium-based plate, to reduce the difference in coefficient of thermal expansion, and thus to resist the thermal cycling.

Place, publisher, year, edition, pages
2003.
Keywords [en]
Technology, material, composites, sandwich panels, potting, agent, space, reflector, antenna
Keywords [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-44599ISRN: LTU-EX--03/231--SELocal ID: 25fef6c3-b0cc-41cd-bcb2-4bf698bcd12fOAI: oai:DiVA.org:ltu-44599DiVA, id: diva2:1017878
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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