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Crash Beam Made of Steel and Carbon Fiber Composite
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This report is a Master Thesis in Mechanical engineering at Luleå University of Technology. The thesis work was performed at Gestamp HardTech in Luleå, Sweden. Gestamp HardTech invented the press hardening technique and now develops and manufactures press hardened safety components for the automotive industry. The thesis was also made in collaboration with Swerea SICOMP in Piteå, Sweden, which is one of Europe’s leading research institutes in the field of polymer fiber composites.The goal of this thesis was to find a way so that a press hardened steel beam could be reinforced with carbon fiber composite so that the strength of both materials would be utilized and in that way be able to make the beam lighter. By using computer aided design and FEM-analysis to simulate three-point bending on press hardened steel beams with carbon fiber composite reinforcements a few different beam designs could be selected for further evaluation. Prototypes of these selected beams where then manufactured and tested so that the simulations could be compared with real life testing results. The results from the prototype testing showed that using carbon fiber composite together with press hardened steel, the way that is done in this report is good for increasing the peak force per weight of the beam. While increasing the peak force, the carbon fiber reinforcements made the stresses too high on the flanges of the beam when testing so that the steel would crack. These cracks caused the beam to stop absorbing energy and became worse at total energy absorption than a reference beams made from only press hardened steel.The recommendations for further studies in this area are mainly to avoid cracking in the steel so that the beam will continue to absorb energy for a longer time. The carbon fiber composite can also be more optimized both with placement on the beam as well as with the fiber directions so that it can be even lighter while maintaining the strength.

Place, publisher, year, edition, pages
2015.
Keywords [en]
Technology
Keywords [sv]
Teknik, Krockbalk, presshärdat, stål, komposit, Hardtech
Identifiers
URN: urn:nbn:se:ltu:diva-48495Local ID: 5f1de7a5-ee2b-4a76-bbc5-fd4d182a8f10OAI: oai:DiVA.org:ltu-48495DiVA, id: diva2:1021837
External cooperation
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Note
Validerat; 20151209 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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