Scientific Program

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Virtual poster session

On the way to mass production of unit-cell based auxetic materials

Wednesday (07.10.2020)
19:04 - 19:07 Room 1
Part of:
18:40 Virtual poster session Development of CFRP - hybrid foam composites for improved light-weight design of electric vehicles 1 Joachim Baumeister
18:43 Virtual poster session Study of the thermal conductivity of powdered microcellular polymers based on PMMA 1 Ph.D. Ismael Sánchez
18:46 Virtual poster session Manufacturing of functional aluminium matrix syntactic foams 1 Alexandra Kemény
18:49 Virtual poster session Manufacturing and comparison of AlSi12 matrix unimodal and bimodal syntactic metal foams 1 Borbála Leveles
18:52 Virtual poster session The effect of elastomer viscosity in pp/poe foams produced by core-back injection moulding over impact properties 1 Ph.D. Santiago Muñoz Pascual
18:55 Virtual poster session Modelling of the mechanisms of heat transfer in glass foams at different temperatures 1 Paula Cimavilla-Román
18:58 Virtual poster session Thermal conductivity of polyisocyanurate foams (PIR) produced using hydrofluoroolefins (HFOs) as blowing agents 1 Ph.D. Patricia Torres
19:01 Virtual poster session Multiscale modeling of biopolymer aerogels 1 Dr.-Ing. Ameya Rege
19:04 Virtual poster session On the way to mass production of unit-cell based auxetic materials 1 Angela Schwarz
19:07 Virtual poster session Wavy knits – enabling the production of auxetic materials 1 Angela Schwarz
19:10 Virtual poster session Influence of Sample Size on Dynamic Compression of Metal Syntactic Foams 1 Nima Movahedi
19:13 Virtual poster session Synthesis of new non-isocyanate polyurethane foams based on cyclic triscarbonates and diamines 1 Ph.D. Mercedes Santiago-Calvo
19:16 Virtual poster session Formation of monodisperse surfactant foams 1 Prof. Dr. Rumen Krastev
19:19 Virtual poster session Analysis of a AlMg2.5 matrix syntactic foam produced via thixoinfiltration of loosely packed and micro structured recycled balloons 1 João Paulo Paschoal
19:22 Virtual poster session In-situ observation of combustion foaming process for synthesizing porous Al3Ti by X-ray radioscopy 1 Takamasa Inukai
19:25 Virtual poster session Characterization of 3D printed PHBV+BG scaffolds for bone regeneration 1 Prof. Dr. Elida B. Hermida
19:28 Virtual poster session Rheology of a hydrogel-ink, printing fidelity and elastic behavior of 3D-printed scaffolds 1 Prof. Dr. Elida B. Hermida
19:31 Virtual poster session Keratinocytes hacat proliferation on 3D-printed chitosan-collagen scaffolds 1 Prof. Dr. Elida B. Hermida
19:34 Virtual poster session The microhardness and microstructure studies on the sintered open-cell nickel foam 0 Faeze Barzegar
19:37 Virtual poster session Characterization of porous titanium implants produced by 3D printer technique 0 Dr. Akram Salehi
19:40 Virtual poster session Adapting polymer derived ceramic membranes for emulsification process 1 Natália Cristina Fontão
19:43 Virtual poster session Poster discussion in video chat rooms 0
Session Chair

Session V.1: Session 1
Belongs to:
General Topic V: Virtual poster session

Auxetic materials exhibit unique properties which are not found in nature - like a negative Poisson´s Ratio - originating from a defined internal structure of the material, based on small repeating building blocks, the unit-cells. Origami is the art of paper folding in the Japanese culture and established as an engineering design method. One of the most frequently regarded structures based on origami folding is the Miura-Ori pattern. The unit cell of this pattern consists of four identical parallelogram shaped surfaces which form a foldable 2D structure. A layer formed of a 2D concatenation of such unit-cells has an auxetic behaviour and can be compressed to a compact or unfolded to flat structure. Such 2D structures can be stacked to 3D structures also exhibiting auxetic behaviour. The response of single or stacked unit-cell based materials to dynamic compression and the influence of various geometric parameters have been studied in literature on 3D printed samples or pressed metal sheets.

In view of a future production technique suitable for auxetic bulk materials in big volumes, this work investigates the quasi-static behaviour of single and stacked structured layers in tensile test, which has rarely been examined numerically and experimentally with other production techniques than 3D printing. The single layers were manufactured using a thermoplastic polyurethane in a thermoforming process. In a first step, the quasi-static behaviour of single layers was analysed in tensile tests. In order to achieve a bulk material, layers with various folded angles were stacked and also analysed. Furthermore, the type of connection between the different layers and the influence of different connection methods were investigated. The paper compares the results from numerical simulations of the bulk materials properties and experimental results.

Angela Schwarz
Fraunhofer Institute for Chemical Technology ICT
Additional Authors:
  • Franziska Wenz
    Fraunhofer Institute for Mechanics of Materials IWM
  • Konstantin Kappe
    Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut, EMI
  • Tobias Lichti
    Fraunhofer Institute for Industrial Mathematics ITWM
  • Dr. Christof Hübner
    Fraunhofer Institute for Chemical Technology ICT