Ontology type: schema:ScholarlyArticle Open Access: True
2021-09-13
AUTHORSF. P. A. van Berlo, R. Cardinaels, G. W. M. Peters, P. D. Anderson
ABSTRACTFilament stretching rheometry is a prominent experimental method to determine rheological properties in extensional flow whereby the separating plates determine the extension rate. In literature, several correction factors that can compensate for the errors introduced by the shear contribution near the plates have been introduced and validated in the linear viscoelastic regime. In this work, a systematic analysis is conducted to determine if a material-independent correction factor can be found for non-linear viscoelastic polymers. To this end, a finite element model is presented to describe the flow and resulting stresses in the filament stretching rheometer. The model incorporates non-linear viscoelasticity and a radius-based controller for the plate speed is added to mimic the typical extensional flow in filament stretching rheometry. The model is validated by comparing force simulations with analytical solutions. The effects of the end-plates on the extensional flow and resulting force measurements are investigated, and a modification of the shear correction factor is proposed for the non-linear viscoelastic flow regime. This shows good agreement with simulations performed at multiple initial aspect ratios and strain rates and is shown to be valid for a range of polymers with non-linear rheological behaviour. More... »
PAGES691-709
http://scigraph.springernature.com/pub.10.1007/s00397-021-01299-9
DOIhttp://dx.doi.org/10.1007/s00397-021-01299-9
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