- AutorIn
- Adrian Ehrenhofer Technische Universität Dresden, Fakultät Maschinenwesen, Institut für Festkörpermechanik, Professur für Mechanik multifunktionaler Strukturen
- Alice MietingTechnische Universität Dresden, Fakultät Maschinenwesen, Institut für Festkörpermechanik, Professur für Mechanik multifunktionaler Strukturen
- Sascha PfeilTechnische Universität Dresden, Fakultät Maschinenwesen, Institut für Festkörpermechanik, Professur für Mechanik multifunktionaler Strukturen
- Johannes Mersch
- Chokri Cherif
- Gerald Gerlach
- Thomas Wallmersperger
- Titel
- An automatically rainproofing bike helmet through light-sensitive hydrogel meshes
- Untertitel
- Design, modeling and experiments
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa2-742187
- Konferenz
- SPIE Smart Structures + Nondestructive Evaluation. Online, 27.04. – 09.05.2020
- Quellenangabe
- Electroactive Polymer Actuators and Devices (EAPAD) XXII
Herausgeber: Yoseph Bar-Cohen
Erscheinungsort: Bellingham
Verlag: SPIE
Erscheinungsjahr: 2020
Titel Schriftenreihe: Proceedings of SPIE
Bandnummer Schriftenreihe: 11375 - Erstveröffentlichung
- 2020
- Abstract (EN)
- For everyday cycling, one needs to carry rainproof clothing just for the case of unexpected downpours. In the present research, we present a concept for a helmet which is automatically rainproof when the rain starts. When the sun comes out, the helmet is breathable again even before it completely dries up. This functionality is provided by active hydrogel meshes. Hydrogel meshes offer great advantages due to their ability to change the aperture size with swelling and deswelling. In our current work, we present the design and modeling steps for hydrogel-layered active meshes which use (i) swelling and deswelling in hydrated state and (ii) swelling starting from the dry state. The main goal is to close the air openings of a bicycle helmet when rain starts as an automatic rainproofing. This can be achieved through the swelling of the hydrogel pNiPAAM-co-chlorophyllin in the meshes, which leads to closing when hydrated. At the same time, the light-sensitive behavior leads to opening of the apertures under direct sun exposure, i.e. when the sun appears again after the rain. We present the steps of modeling and design using the Normalized Extended Temperature-Expansion-Model (NETEM) to perform simulations in Abaqus. The model is capable of describing both the swelling of the hydrogel under light stimulus and the volume change due to hydration. It is based on the analogy between free swelling and thermal expansion and defined for nonlinear displacements. We also discuss the fabrication process of hydrogel-layered fibers and challenges in their application and simulation. As a proof of concept for hydrogel-layered meshes, we show preliminary experimental results of a poly(acrylamide)/poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAAm/PAMPS) hydrogel with semi-interpenetrated network (SIPN) structure and its swelling capacities on a mesh. Starting from the active hydrogel meshes as presented in the current work, the next step can be smart textiles that harness the power of hydrogels: the adaptation to combinations of stimuli - like humidity, temperature and brightness - that define environments.
- Andere Ausgabe
- Link zum Artikel, der zuerst in der Reihe 'Proceedings of SPIE' erschienen ist.
DOI: 10.1117/12.2557728 - Freie Schlagwörter (DE)
- Intelligente Fahrradhelme, Hydrogele, Modellierung und Simulation, Hydrogel-Meshes, Finite-Elemente-Methode, Experimente
- Freie Schlagwörter (EN)
- Smart Bike Helmets, Hydrogels, Modeling and Simulation, Hydrogel Meshes, Finite-Element- Method, Experiments
- Klassifikation (DDC)
- 620
- Verlag
- SPIE, Bellingham
- Förder- / Projektangaben
- Deutsche Forschungsgemeinschaft (DFG)
Graduiertenkollegs
Hydrogel-basierte Mikrosysteme (GRK 1865)
ID: 211944370
Deutsche Forschungsgemeinschaft (DFG)
Interaktive Faser-Elastomerverbunde (GRK 2430)
ID: 380321452 - Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:14-qucosa2-742187
- Veröffentlichungsdatum Qucosa
- 22.03.2021
- Dokumenttyp
- Konferenzbeitrag
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis