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dc.contributor.authorOlley, Peter
dc.date.accessioned2020-02-14T12:42:31Z
dc.date.available2020-02-14T12:42:31Z
dc.date.issued2020-04
dc.identifier.citationOlley P (2020) An approximation to the PTT viscoelastic model for Gas Assisted Injection Moulding simulation. Journal of the Non-Newtonian Fluid Mechanics. 278: 104246.en_US
dc.identifier.urihttp://hdl.handle.net/10454/17633
dc.descriptionYesen_US
dc.description.abstractAn approximation to the Phan-Thien Tanner (PTT) constitutive model is developed with the aim of giving low-cost simulation of Gas Assisted Injection Moulding (GAIM) while incorporating important viscoelastic characteristics. It is shown that the developed model gives a response typical of full viscoelastic models in transient and steady state uniaxial and constant shear rate deformations. The model is incorporated into a 3D finite element GAIM simulation which uses the ‘pseudo-concentration’ method to predict residual polymer, and applied to published experimental results for a Boger fluid and a shear-thinning polystyrene melt. It is shown that the simulation gives a very good match to published results for the Boger fluid which show increasing Residual Wall Thickness (RWT) with increasing Deborah number. Against the shear-thinning polymer, the quality of match depends upon which of two ‘plausible’ relaxation times is chosen; qualitatively different results arise from two different means of estimating a single relaxation time. A ‘multi-mode’ approach is developed to avoid this uncertainty. It is shown that the multi-mode approach gives decreasing RWT with increasing Deborah number in agreement with the published experimental results, and avoids the issues that arise from estimating a single relaxation time for a molten polymer.en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.jnnfm.2020.104246en_US
dc.rights© 2020 Elsevier B.V. All rights reserved. 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.en_US
dc.subjectGas Assisted Injection Moulding (GAIM)en_US
dc.subjectPTT approximationen_US
dc.subjectResidual wall thicknessen_US
dc.titleAn approximation to the PTT viscoelastic model for Gas Assisted Injection Moulding simulationen_US
dc.status.refereedYesen_US
dc.date.Accepted2020-01-30
dc.date.application2020-02-06
dc.typeArticleen_US
dc.type.versionAccepted manuscripten_US
refterms.dateFOA2020-02-14T12:43:00Z


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