Varying efficiency of differential constitutive equations based on either steady shear or unsteady (LAOS) characteristics

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F17%3A00487313" target="_blank" >RIV/67985874:_____/17:00487313 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Varying efficiency of differential constitutive equations based on either steady shear or unsteady (LAOS) characteristics
Original language description
Efficiency of differential constitutive models (exponential Phan-Tien and Tanner, Giesekus, Leonov, and modified eXtended Pom-Pom) describing behaviour of a solution of poly(ethylene oxide) in dimethyl sulfoxide is evaluated in two steps. Firstly, nonlinear parameters of the models are optimized with the respect to steady shear measurements and sonsequently their ability to describe large amplitude oscillatory shear (LAOS) characteristics is tested. Secondly, nonlinear parameters of the models are optimized with the respect to LAOS measurements (both real and imaginary component of the stress amplitude are taken into account) and applicability of the models is tested against steady shear characteristics. In the first case, it is shown that the models are not capable of fitting the LAOS characteristics. In the second case, it is shown that optimization of nonlinear parameters is more responsible. Hence, a determination of the model parameters through LAOS measurements makes the models much more efficient.
Czech name
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Czech description
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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
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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