The role of the Gordon-Schowalter derivative term in the constitutive models - improved flexibility of the modified XPP model

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F15%3A00438457" target="_blank" >RIV/67985874:_____/15:00438457 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s00396-015-3498-7" target="_blank" >http://dx.doi.org/10.1007/s00396-015-3498-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00396-015-3498-7" target="_blank" >10.1007/s00396-015-3498-7</a>

Result language

angličtina

Original language name

The role of the Gordon-Schowalter derivative term in the constitutive models - improved flexibility of the modified XPP model

Original language description

Constitutive models that complete the set of equations describing the flow of polymer melts should respect objective thermodynamics and stability conditions ensuring their validity in the whole range of possible deformation flow. However, in practice a very good description of flow situations can be achieved with the models not complying with the physical assumptions in all respects. Analogously to the term characterizing yield stress in empirical viscoplastic models, the term represented by the Gordon-Schowalter (GS) derivative in the differential constitutive models contributes to better fitting the experimental data, especially shear thinning. Efficiency of the recently presented modified XPP model (just one non-linear parameter per mode) implementing the GS derivative term (one additional non-affine motion parameter per mode) is improved (documented on LDPE, HDPE, and PVB materials), and a comparison with the exponential PTT and PTT-XPP models (a priori containing the GS derivative

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BK - Liquid mechanics

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

Colloid and Polymer Science

ISSN

0303-402X

e-ISSN

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Volume of the periodical

4

Issue of the periodical within the volume

293

Country of publishing house

DE - GERMANY

Number of pages

10

Pages from-to

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UT code for WoS article

000352074200023

EID of the result in the Scopus database

2-s2.0-84939947752