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

Kód výsledku v IS VaVaI

RIV/67985874:_____/18:00494807 - isvavai.cz

Výsledek na webu

http://journal.it.cas.cz/63(2018)-4/Complete%20Issue%2063(2018)-4.pdf

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

GA17-26808S: Charakterizace polymerních tavenin a roztoků pomocí konstitutivních modelů

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Technica CSAV

ISSN

0001-7043

e-ISSN

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Svazek periodika

63

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

16

Strana od-do

501-516

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85051174091