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    Experimental analysis of the tensile property of FFF-printed elastomers

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    Publication date
    2020-10
    End of Embargo
    2021-06-13
    Author
    Lin, X.
    Coates, Philip D.
    Hebda, Michael
    Wang, R.
    Lu, Y.
    Zhang, L.
    Keyword
    Fused filament fabrication
    Thermoplastic polyurethane
    Nozzle height
    Mechanical property
    Rights
    © 2020 Elsevier Ltd. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Designing and manufacturing functional parts with enhanced mechanical property is a major goal of fused filament fabrication (FFF) for polymeric elastomers, which exhibits major advantages in producing such parts with a range of structures. But the unsatisfactory mechanical performance constrains greatly its real application and there is yet no consensus in the mechanical characterization of printed samples. This work takes the nozzle height as the considered factor and tests the tensile property of FFF-printed thermoplastic polyurethane (TPU). Rheological property of the TPU melt, represented here by die swell behavior and shear viscosity, were measured initially to obtain a preliminary assessment of the material suitability and an optimization of melt extrusion conditions for FFF processing. Then correlation between the cross-section profile of deposited bead and the tensile performance of printed sample were evaluated. Both the shape of deposited bead and the bonding strength of two adjacent beads are emphasized when explaining the measured tensile strength. The significance of molecular permeation efficiency at bead-bead interfaces, and bonding-releasing patterns between adjacent beads to the tensile failure of printed objects is discussed.
    URI
    http://hdl.handle.net/10454/18310
    Version
    Accepted manuscript
    Citation
    Lin X, Coates P, Hebda M et al (2020) Experimental analysis of the tensile property of FFF-printed elastomers. Polymer Testing. 90: 106687.
    Link to publisher’s version
    https://doi.org/10.1016/j.polymertesting.2020.106687
    Type
    Article
    Notes
    The full-text of this article will be released for public view at the end of the publisher embargo on 13 June 2021.
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    Engineering and Informatics Publications

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