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doi:10.22028/D291-34641
Titel: | Hybrid Auxetic Structures: Structural Optimization and Mechanical Characterization |
VerfasserIn: | Bronder, Stefan Adorna, Marcel Fíla, Tomáš Koudelka, Petr Falta, Jan Jiroušek, Ondřej Jung, Anne |
Sprache: | Englisch |
Titel: | Advanced Engineering Materials |
Bandnummer: | 23 |
Heft: | 5 |
Verlag/Plattform: | Wiley |
Erscheinungsjahr: | 2021 |
Freie Schlagwörter: | compression experiments electrochemical coatings hybrid materials Open Hopkinson Pressure Bar parametric optimization strain rate effects |
DDC-Sachgruppe: | 500 Naturwissenschaften |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | With their increased energy absorption capacity, auxetic materials are perfectly fit to develop new, enhanced lightweight crash absorbers for cars. Herein, the mass distribution along the struts is optimized via finite element analysis with a parameterized optimization. Four different auxetic unit cells are taken from the literature and their struts parameterize, the models simulate, and the mass specific energy absorption capacity optimizes. The two models with the highest energy absorption capacity are then selected for experimental investigation and produced by additive manufacturing from a polymer. To further enhance the mechanical properties, the specimens are electrochemically coated with nickel and the polymer molten out by pyrolysis. Those Ni/polymer hybrids are subjected to quasistatic and dynamic impact experiments. Only a small strain rate sensitivity can be detected under dynamic loading, namely, a higher plastic collapse and higher plateau stress. The hollow struts are folding instead of bending, which render them much weaker than predicted by the simulation. In conclusion, it is possible to improve existing crash absorber elements with tailored auxetic hybrid structures. They absorb higher amounts of energy without changing their stiffness under dynamic loading while saving mass and cost. |
DOI der Erstveröffentlichung: | 10.1002/adem.202001393 |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-346411 hdl:20.500.11880/31715 http://dx.doi.org/10.22028/D291-34641 |
ISSN: | 1527-2648 1438-1656 |
Datum des Eintrags: | 6-Sep-2021 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Materialwissenschaft und Werkstofftechnik |
Professur: | NT - Prof. Dr. Stefan Diebels |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Dateien zu diesem Datensatz:
Datei | Beschreibung | Größe | Format | |
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adem.202001393.pdf | 3,39 MB | Adobe PDF | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons