On the reduction of nonlinear parameters in the eXtended Pom-Pom differential constitutive model

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F18%3A00494807" target="_blank" >RIV/67985874:_____/18:00494807 - isvavai.cz</a>
Result on the web
<a href="http://journal.it.cas.cz/63(2018)-4/Complete%20Issue%2063(2018)-4.pdf" target="_blank" >http://journal.it.cas.cz/63(2018)-4/Complete%20Issue%2063(2018)-4.pdf</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
On the reduction of nonlinear parameters in the eXtended Pom-Pom differential constitutive model
Original language description
An application of differential constitutive models enables a prediction of rheological characteristics of polymer materials. Apart from two linear parameters (relaxation time and modulus) common for all models, a number of adjustable (non-linear) parameters in the individual constitutive models differ. At present for materials exhibiting strain hardening (sudden increase of elongational viscosity) this number attains two or more. This causes that a total number of all parameters per all modes is not moderate and any reduction may contribute to a non-negligible simplification of applied numerical methods and unambiguity of the nonlinear parameters. The aim of this contribution is to compare efficiency of the proposed modified eXtended Pom-Pom model (one nonlinear parameter only per mode) with the eXtended Pom-Pom model (nominally three parameters) and the modified Leonov model (two parameters). In spite of one nonlinear parameter only, it is shown very good efficiency of the modified XPP model using three different low-density polyethylene materials.
Czech name
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Czech description
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Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/GA17-26808S" target="_blank" >GA17-26808S: Characterization of polymer melts and solutions by means of constitutive equations</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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