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dc.contributor.authorSweeney, John
dc.contributor.authorSpencer, Paul E.
dc.contributor.authorNair, Karthik Jayan
dc.contributor.authorCoates, Philip D.
dc.date.accessioned2019-08-27T12:48:37Z
dc.date.available2019-08-27T12:48:37Z
dc.date.issued2019-08-13
dc.identifier.citationSweeney J, Spencer P, Nair K et al (2019) Modelling the mechanical and strain recovery behaviour of partially crystalline PLA. Polymers. 11(8): 1342.en_US
dc.identifier.urihttp://hdl.handle.net/10454/17228
dc.descriptionYesen_US
dc.description.abstractThis is a study of the modelling and prediction of strain recovery in a polylactide. Strain recovery near the glass transition temperature is the underlying mechanism for the shape memory in an amorphous polymer. The investigation is aimed at modelling such shape memory behaviour. A PLA-based copolymer is subjected to stress–strain, stress relaxation and strain recovery experiments at large strain at 60 C just below its glass transition temperature. The material is 13% crystalline. Using published data on the mechanical properties of the crystals, finite element modelling was used to determine the effect of the crystal phase on the overall mechanical behaviour of the material, which was found to be significant. The finite element models were also used to relate the stress–strain results to the yield stress of the amorphous phase. This yield stress was found to possess strain rate dependence consistent with an Eyring process. Stress relaxation experiments were also interpreted in terms of the Eyring process, and a two-process Eyring-based model was defined that was capable of modelling strain recovery behaviour. This was essentially a model of the amorphous phase. It was shown to be capable of useful predictions of strain recovery.en_US
dc.description.sponsorshipFunded by the Engineering and Physical Sciences Research Council, grant number EP/L020572/1en_US
dc.language.isoenen_US
dc.rights© 2019 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 (http://creativecommons.org/licenses/by/4.0/).en_US
dc.subjectPLAen_US
dc.subjectStrain recoveryen_US
dc.subjectModellingen_US
dc.subjectFinite element methoden_US
dc.subjectCrystallinityen_US
dc.titleModelling the mechanical and strain recovery behaviour of partially crystalline PLAen_US
dc.status.refereedYesen_US
dc.date.Accepted2019-08-09
dc.date.application2019-08-13
dc.typeArticleen_US
dc.type.versionPublished versionen_US
dc.identifier.doihttps://doi.org/10.3390/polym11081342
refterms.dateFOA2019-08-27T12:49:01Z


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