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Materials with variable stiffness
RISE, Swerea, SICOMP.
RISE, Swerea, SICOMP. Luleå University of Technology, Sweden.ORCID iD: 0000-0003-3755-6419
RISE, Swerea, SICOMP.
RISE, Swerea, SICOMP.
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2015 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2015Conference paper, Published paper (Refereed)
Abstract [en]

In this study different concepts to attain a material that can reduce its stiffness upon external stimulation were evaluated regarding their suitability for traffic safety applications. All concepts rely on resistive heating of a carbon fibre reinforcement upon application of electric current through the fibres. The stiffness reduction is achieved by a phase transformation due to heating of the material. The phase transformation takes place either in a thermoplastic interphase, in a thermoplastic matrix or in a thermoset matrix, depending on the concept. The different concepts were studied regarding their thermomechanical and processing properties and their ability to reduce their stiffness upon application of an electric current was tested. Moreover, the materials were evaluated regarding their potential for fast activation, which is crucial for applications in traffic safety. Stiffness-reduction was achieved upon application of an electric current, where the activation temperature was between 60 and 120°C and the extent of stiffness-reduction varied between 50 and 90%, depending on the material. The response time was found to depend to a large extent on the amount of material, which leads to the conclusion that smart design solutions are required for larger parts. It is concluded that the concepts vary in their thermal, mechanical and processing properties as well as in their extent of stiffness-reduction upon activation. The results presented in this work prove the feasibility of the studied materials for traffic safety applications and the concepts allow further optimization of the materials for specific applications

Place, publisher, year, edition, pages
International Committee on Composite Materials , 2015.
Keywords [en]
Multifunctional composites, Traffic safety, Variable stiffness
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42227Scopus ID: 2-s2.0-84962755132OAI: oai:DiVA.org:ri-42227DiVA, id: diva2:1379634
Conference
20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015
Note

Funding details: European Commission, 314567; Funding text 1: The authors like to express their gratitude to Runar Långström for manufacturing of composite materials. Moreover, the authors like to express their gratitude to COMFIL for providing material. The presented work was funded by the European Commission within the project ENLIGHT (Grant agreement No: 314567).

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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