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    Constitutive modelling of polylactic acid at large deformation using multiaxial strains

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    Sweeney_et_al_Polymers (7.573Mb)
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    Publication date
    2021-08
    Author
    Sweeney, John
    Spencer, Paul E.
    Thompson, Glen P.
    Barker, David
    Coates, Philip D.
    Keyword
    PLA
    Multiaxial
    Modelling
    Eyring
    Rights
    © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
    Peer-Reviewed
    Yes
    Open Access status
    openAccess
    
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    Abstract
    Sheet specimens of a PLLA-based polymer have been extended at a temperature near to the glass transition in both uniaxial and planar tension, with stress relaxation observed for some time after reaching the final strain. Both axial and transverse stresses were recorded in the planar experiments. In all cases during loading, yielding at small strain was followed by a drop in true stress and then strain hardening. This was followed by stress relaxation at constant strain, during which stress dropped to reach an effectively constant level. Stresses were modelled as steady state and transient components. Steady-state components were identified with the long-term stress in stress relaxation and associated with an elastic component of the model. Transient stresses were modelled using Eyring mechanisms. The greater part of the stress during strain hardening was associated with dissipative Eyring processes. The model was successful in predicting stresses in both uniaxial and planar extension over a limited range of strain rate.
    URI
    http://hdl.handle.net/10454/18827
    Version
    Published version
    Citation
    Sweeney J, Spencer P, Thompson G et al (2021) Constitutive modelling of polylactic acid at large deformation using multiaxial strains. Polymers. 13(17): 2967.
    Link to publisher’s version
    https://doi.org/10.3390/polym13172967
    Type
    Article
    Collections
    Engineering and Informatics Publications

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