Articles producció científica> Enginyeria Mecànica

Motion control in free-standing shape-memory actuators

  • Identification data

    Identifier: imarina:6389460
    Authors:
    Belmonte ALama GCerruti PAmbrogi VFernández-Francos XDe La Flor S
    Abstract:
    © 2018 IOP Publishing Ltd. In this work, free-standing shape-memory thermally triggered actuators are developed by laminating 'thiol-epoxy'-based glassy thermoset (GT) and stretched liquid-crystalline network (LCN) films. A sequential curing process was used to obtain GTs with tailored thermomechanical properties and network relaxation dynamics, and also to assemble the final actuator. The actuation extent, rate and time were studied by varying the GT and the heating rate in thermo-actuation with an experimental approach. The results demonstrate that it is possible to tailor the actuation rate and time by designing GT materials with a glass transition temperature close to that of the liquid-crystalline-to-isotropic phase transition of the LCN, thus making it possible to couple the two processes. Such coupling is also possible in rapid heating processes even when the glass transition temperature of the GT is clearly lower than the isotropization temperature of the LCN, depending on the network relaxation dynamics of the GT and the presence of thermal gradients within the actuators. Interestingly, varying the GT network relaxation dynamics does not affect the actuation extent. As predicted by the analytical model developed in our previous work, the modulus of the GT layer is mainly responsible for the actuation extent. Finally, to demonstrate the enhanced control of the actuation, specifically designed actuators were assembled in a three-dimensional actuating device able to make complex motions (including 'S-type' bending). This approach makes it possible to engineer advanced functional materials for application in self-adaptable structures and soft robotics.
  • Others:

    Author, as appears in the article.: Belmonte A; Lama G; Cerruti P; Ambrogi V; Fernández-Francos X; De La Flor S
    Department: Enginyeria Mecànica
    URV's Author/s: De la Flor Lopez, Silvia / Fernández Francos, Xavier
    Keywords: Thermosets Stresses Shape-shifting Polymers Network structure Liquid-crystalline network Liquid-crystalline elastomers Free-standing Experimental study Epoxy click systems Dual-curing Behavior Actuator
    Abstract: © 2018 IOP Publishing Ltd. In this work, free-standing shape-memory thermally triggered actuators are developed by laminating 'thiol-epoxy'-based glassy thermoset (GT) and stretched liquid-crystalline network (LCN) films. A sequential curing process was used to obtain GTs with tailored thermomechanical properties and network relaxation dynamics, and also to assemble the final actuator. The actuation extent, rate and time were studied by varying the GT and the heating rate in thermo-actuation with an experimental approach. The results demonstrate that it is possible to tailor the actuation rate and time by designing GT materials with a glass transition temperature close to that of the liquid-crystalline-to-isotropic phase transition of the LCN, thus making it possible to couple the two processes. Such coupling is also possible in rapid heating processes even when the glass transition temperature of the GT is clearly lower than the isotropization temperature of the LCN, depending on the network relaxation dynamics of the GT and the presence of thermal gradients within the actuators. Interestingly, varying the GT network relaxation dynamics does not affect the actuation extent. As predicted by the analytical model developed in our previous work, the modulus of the GT layer is mainly responsible for the actuation extent. Finally, to demonstrate the enhanced control of the actuation, specifically designed actuators were assembled in a three-dimensional actuating device able to make complex motions (including 'S-type' bending). This approach makes it possible to engineer advanced functional materials for application in self-adaptable structures and soft robotics.
    Thematic Areas: Signal processing Química Mechanics of materials Materials science, multidisciplinary Materials science (miscellaneous) Materials science (all) Materials science Materiais Interdisciplinar Instruments & instrumentation General materials science Engenharias iii Engenharias ii Electrical and electronic engineering Condensed matter physics Civil and structural engineering Atomic and molecular physics, and optics
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 1361665X
    Author's mail: xavier.fernandez@urv.cat silvia.delaflor@urv.cat
    Author identifier: 0000-0002-3492-2922 0000-0002-6851-1371
    Record's date: 2024-09-07
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://iopscience.iop.org/article/10.1088/1361-665X/aac278
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Smart Materials And Structures. 27 (7):
    APA: Belmonte A; Lama G; Cerruti P; Ambrogi V; Fernández-Francos X; De La Flor S (2018). Motion control in free-standing shape-memory actuators. Smart Materials And Structures, 27(7), -. DOI: 10.1088/1361-665X/aac278
    Article's DOI: 10.1088/1361-665X/aac278
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2018
    Publication Type: Journal Publications
  • Keywords:

    Atomic and Molecular Physics, and Optics,Civil and Structural Engineering,Condensed Matter Physics,Electrical and Electronic Engineering,Instruments & Instrumentation,Materials Science,Materials Science (Miscellaneous),Materials Science, Multidisciplinary,Mechanics of Materials,Signal Processing
    Thermosets
    Stresses
    Shape-shifting
    Polymers
    Network structure
    Liquid-crystalline network
    Liquid-crystalline elastomers
    Free-standing
    Experimental study
    Epoxy click systems
    Dual-curing
    Behavior
    Actuator
    Signal processing
    Química
    Mechanics of materials
    Materials science, multidisciplinary
    Materials science (miscellaneous)
    Materials science (all)
    Materials science
    Materiais
    Interdisciplinar
    Instruments & instrumentation
    General materials science
    Engenharias iii
    Engenharias ii
    Electrical and electronic engineering
    Condensed matter physics
    Civil and structural engineering
    Atomic and molecular physics, and optics
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