KOTNIK, Urban ;OSELI, Alen ;KUTIN, Jože ;HALILOVIČ, Miroslav ;SLEMENIK PERŠE, Lidija .
Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene.
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 72, n.1-2, p. 21-28, january 2026.
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/evaluation-of-measurement-uncertainty-in-creep-based-determination-of-viscoelastic-material-functions-of-polypropylene/>. Date accessed: 06 apr. 2026.
doi:http://dx.doi.org/10.5545/sv-jme.2025.1548.
Kotnik, U., Oseli, A., Kutin, J., Halilovič, M., & Slemenik Perše, L.
(2026).
Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene.
Strojniški vestnik - Journal of Mechanical Engineering, 72(1-2), 21-28.
doi:http://dx.doi.org/10.5545/sv-jme.2025.1548
@article{sv-jmesv-jme.2025.1548,
author = {Urban Kotnik and Alen Oseli and Jože Kutin and Miroslav Halilovič and Lidija Slemenik Perše},
title = {Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene},
journal = {Strojniški vestnik - Journal of Mechanical Engineering},
volume = {72},
number = {1-2},
year = {2026},
keywords = {viscoelasticity; creep test; polypropylene; measurement uncertainty; },
abstract = {Modern numerical models use time-dependent material parameters as input data to simulate the viscoelastic response of polymers. Reliable numerical predictions therefore depend on the accurate determination of these parameters. Understanding the measurement uncertainty associated with their identification is essential for assessing the expected range and reliability of the simulation results. Although creep-based uncertainty analyses have been reported for other materials, uncertainty evaluations for polymers that require the determination of multiple viscoelastic material functions remain scarce, with existing polymer studies primarily relying on relaxation tests. This study experimentally analyzes the viscoelastic behavior of polypropylene at 60 °C through tensile and shear creep tests based on extensional and rotational rheometry. The tensile, shear, and bulk compliance functions were determined together with their corresponding standard and expanded measurement uncertainties in accordance with the JCGM 100:2008 guideline. Type A uncertainties were found to dominate the overall uncertainty, with relative expanded uncertainties of approximately 3 percent for shear compliance and up to 25 percent for bulk compliance. The study identifies the main sources of uncertainty and proposes strategies for their reduction, including increasing the number of measurement repetitions and improving environmental control. Overall, a comprehensive uncertainty evaluation of the creep-based determination of viscoelastic material functions is presented, leading to more reliable input data for numerical simulations.},
issn = {0039-2480}, pages = {21-28}, doi = {10.5545/sv-jme.2025.1548},
url = {https://www.sv-jme.eu/article/evaluation-of-measurement-uncertainty-in-creep-based-determination-of-viscoelastic-material-functions-of-polypropylene/}
}
Kotnik, U.,Oseli, A.,Kutin, J.,Halilovič, M.,Slemenik Perše, L.
2026 January 72. Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 72:1-2
%A Kotnik, Urban
%A Oseli, Alen
%A Kutin, Jože
%A Halilovič, Miroslav
%A Slemenik Perše, Lidija
%D 2026
%T Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene
%B 2026
%9 viscoelasticity; creep test; polypropylene; measurement uncertainty;
%! Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene
%K viscoelasticity; creep test; polypropylene; measurement uncertainty;
%X Modern numerical models use time-dependent material parameters as input data to simulate the viscoelastic response of polymers. Reliable numerical predictions therefore depend on the accurate determination of these parameters. Understanding the measurement uncertainty associated with their identification is essential for assessing the expected range and reliability of the simulation results. Although creep-based uncertainty analyses have been reported for other materials, uncertainty evaluations for polymers that require the determination of multiple viscoelastic material functions remain scarce, with existing polymer studies primarily relying on relaxation tests. This study experimentally analyzes the viscoelastic behavior of polypropylene at 60 °C through tensile and shear creep tests based on extensional and rotational rheometry. The tensile, shear, and bulk compliance functions were determined together with their corresponding standard and expanded measurement uncertainties in accordance with the JCGM 100:2008 guideline. Type A uncertainties were found to dominate the overall uncertainty, with relative expanded uncertainties of approximately 3 percent for shear compliance and up to 25 percent for bulk compliance. The study identifies the main sources of uncertainty and proposes strategies for their reduction, including increasing the number of measurement repetitions and improving environmental control. Overall, a comprehensive uncertainty evaluation of the creep-based determination of viscoelastic material functions is presented, leading to more reliable input data for numerical simulations.
%U https://www.sv-jme.eu/article/evaluation-of-measurement-uncertainty-in-creep-based-determination-of-viscoelastic-material-functions-of-polypropylene/
%0 Journal Article
%R 10.5545/sv-jme.2025.1548
%& 21
%P 8
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 72
%N 1-2
%@ 0039-2480
%8 2026-01-19
%7 2026-01-19
Kotnik, Urban, Alen Oseli, Jože Kutin, Miroslav Halilovič, & Lidija Slemenik Perše.
"Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene." Strojniški vestnik - Journal of Mechanical Engineering [Online], 72.1-2 (2026): 21-28. Web. 06 Apr. 2026
TY - JOUR
AU - Kotnik, Urban
AU - Oseli, Alen
AU - Kutin, Jože
AU - Halilovič, Miroslav
AU - Slemenik Perše, Lidija
PY - 2026
TI - Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene
JF - Strojniški vestnik - Journal of Mechanical Engineering
DO - 10.5545/sv-jme.2025.1548
KW - viscoelasticity; creep test; polypropylene; measurement uncertainty;
N2 - Modern numerical models use time-dependent material parameters as input data to simulate the viscoelastic response of polymers. Reliable numerical predictions therefore depend on the accurate determination of these parameters. Understanding the measurement uncertainty associated with their identification is essential for assessing the expected range and reliability of the simulation results. Although creep-based uncertainty analyses have been reported for other materials, uncertainty evaluations for polymers that require the determination of multiple viscoelastic material functions remain scarce, with existing polymer studies primarily relying on relaxation tests. This study experimentally analyzes the viscoelastic behavior of polypropylene at 60 °C through tensile and shear creep tests based on extensional and rotational rheometry. The tensile, shear, and bulk compliance functions were determined together with their corresponding standard and expanded measurement uncertainties in accordance with the JCGM 100:2008 guideline. Type A uncertainties were found to dominate the overall uncertainty, with relative expanded uncertainties of approximately 3 percent for shear compliance and up to 25 percent for bulk compliance. The study identifies the main sources of uncertainty and proposes strategies for their reduction, including increasing the number of measurement repetitions and improving environmental control. Overall, a comprehensive uncertainty evaluation of the creep-based determination of viscoelastic material functions is presented, leading to more reliable input data for numerical simulations.
UR - https://www.sv-jme.eu/article/evaluation-of-measurement-uncertainty-in-creep-based-determination-of-viscoelastic-material-functions-of-polypropylene/
@article{{sv-jme}{sv-jme.2025.1548},
author = {Kotnik, U., Oseli, A., Kutin, J., Halilovič, M., Slemenik Perše, L.},
title = {Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene},
journal = {Strojniški vestnik - Journal of Mechanical Engineering},
volume = {72},
number = {1-2},
year = {2026},
doi = {10.5545/sv-jme.2025.1548},
url = {https://www.sv-jme.eu/article/evaluation-of-measurement-uncertainty-in-creep-based-determination-of-viscoelastic-material-functions-of-polypropylene/}
}
TY - JOUR
AU - Kotnik, Urban
AU - Oseli, Alen
AU - Kutin, Jože
AU - Halilovič, Miroslav
AU - Slemenik Perše, Lidija
PY - 2026/01/19
TI - Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene
JF - Strojniški vestnik - Journal of Mechanical Engineering; Vol 72, No 1-2 (2026): Strojniški vestnik - Journal of Mechanical Engineering
DO - 10.5545/sv-jme.2025.1548
KW - viscoelasticity, creep test, polypropylene, measurement uncertainty,
N2 - Modern numerical models use time-dependent material parameters as input data to simulate the viscoelastic response of polymers. Reliable numerical predictions therefore depend on the accurate determination of these parameters. Understanding the measurement uncertainty associated with their identification is essential for assessing the expected range and reliability of the simulation results. Although creep-based uncertainty analyses have been reported for other materials, uncertainty evaluations for polymers that require the determination of multiple viscoelastic material functions remain scarce, with existing polymer studies primarily relying on relaxation tests. This study experimentally analyzes the viscoelastic behavior of polypropylene at 60 °C through tensile and shear creep tests based on extensional and rotational rheometry. The tensile, shear, and bulk compliance functions were determined together with their corresponding standard and expanded measurement uncertainties in accordance with the JCGM 100:2008 guideline. Type A uncertainties were found to dominate the overall uncertainty, with relative expanded uncertainties of approximately 3 percent for shear compliance and up to 25 percent for bulk compliance. The study identifies the main sources of uncertainty and proposes strategies for their reduction, including increasing the number of measurement repetitions and improving environmental control. Overall, a comprehensive uncertainty evaluation of the creep-based determination of viscoelastic material functions is presented, leading to more reliable input data for numerical simulations.
UR - https://www.sv-jme.eu/article/evaluation-of-measurement-uncertainty-in-creep-based-determination-of-viscoelastic-material-functions-of-polypropylene/
Kotnik, Urban, Oseli, Alen, Kutin, Jože, Halilovič, Miroslav, AND Slemenik Perše, Lidija.
"Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 72 Number 1-2 (19 January 2026)
