Scientific Program

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Virtual poster session

Wavy knits – enabling the production of auxetic materials

Wednesday (07.10.2020)
19:07 - 19:10 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 2 Faeze Barzegar
19:37 Virtual poster session Characterization of porous titanium implants produced by 3D printer technique 2 Dr. Akram Salehi

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

The application of weft-knitted structures is well-established in different industrial sectors like automotive, medicine or space. For example, a current research project develops a “fishing net” for space which collects space debris and thus protects i.e. the ISS and satellites. An advantage of knits is near-contour production during the manufacturing because of the versatility of the structuring options. A main characteristic for wavy knits is the directional dependence of the properties because of their structure. If the structure is loaded across the wave direction, the elasticity increases and the total surface expanse due to the unfolding of the structure, what is limited or disabled along the wave direction. The mechanical behaviour of the knitted fabric results from the arrangement of the meshes. A well-defined assembly of the meshes enables the implementation of an auxetic behaviour of the fabric.

This work compares auxetic wavy knits with auxetic pattered sheets. The auxetic structures are manufactured in a knitting machine and a thermoforming machine respectively. As knitting material, a polyester monofilament with a diameter of 0.15 mm and for the patterned sheets a thermoplastic polyurethane is used. The mechanical behaviour of each structure is investigated in tensile tests and the influence of mesh order and the geometry of the pattern of the sheet on deformation and stiffens are evaluated. This paper gives an overview about the comparability between weft-knitted structures and patterned sheets.

Angela Schwarz
Fraunhofer Institute for Chemical Technology ICT
Additional Authors:
  • Daniela Schön
    Fraunhofer Institute for Silicate Research ISC
  • Kevin Moser
    Fraunhofer Institute for Chemical Technology ICT