Hybrid Auxetic Structures: Structural Optimization and Mechanical Characterization
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F21%3A00372778" target="_blank" >RIV/68407700:21260/21:00372778 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1002/adem.202001393" target="_blank" >https://doi.org/10.1002/adem.202001393</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/adem.202001393" target="_blank" >10.1002/adem.202001393</a>
Alternative languages
Result language
angličtina
Original language name
Hybrid Auxetic Structures: Structural Optimization and Mechanical Characterization
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/GA19-23675S" target="_blank" >GA19-23675S: Progressive numerical and experimental modelling of innovative sandwich panels with cellular core</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Advanced Engineering Materials
ISSN
1438-1656
e-ISSN
1527-2648
Volume of the periodical
23
Issue of the periodical within the volume
5
Country of publishing house
DE - GERMANY
Number of pages
15
Pages from-to
1-15
UT code for WoS article
000619173500001
EID of the result in the Scopus database
2-s2.0-85100905455