Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene.
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| Title: | Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene. |
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| Alternate Title: | Vrednotenje merilne negotovosti pri določanju viskoelastičnih materialnih funkcij polipropilena na osnovi preizkusov lezenja. |
| Authors: | Kotnik, Urban1, Oseli, Alen1, Kutin, Jože1, Halilovič, Miroslav1, Slemenik Perše, Lidija1 lidija.slemenik.perse@fs.uni-lj.si |
| Source: | Journal of Mechanical Engineering / Strojniški Vestnik. 2026, Vol. 72 Issue 1/2, p21-28. 8p. |
| Subjects: | Measurement uncertainty (Statistics), Creep testing, Polypropylene, Computer simulation, Viscometry, Viscoelastic materials, Viscoelasticity |
| Abstract (English): | 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. [ABSTRACT FROM AUTHOR] |
| Abstract (Slovak): | Sodobni numerični modeli uporabljajo časovno odvisne materialne parametre kot vhodne podatke za simulacijo viskoelastičnega odziva polimerov. Zanesljivost numeričnih napovedi je zato odvisna od točnosti določitve teh parametrov. Razumevanje merilne negotovosti, povezane z njihovo identifikacijo, je ključnega pomena za oceno pričakovanega razpona in zanesljivosti rezultatov simulacij. Čeprav so analize negotovosti na podlagi lezenja za druge materiale že znane, so vrednotenja negotovosti za polimere, ki zahtevajo določitev več viskoelastičnih materialnih funkcij, še vedno redka, obstoječe raziskave polimerov pa temeljijo predvsem na relaksacijskih preizkusih. Ta raziskava eksperimentalno analizira viskoelastično vedenje polipropilena pri 60 °C s pomočjo nateznih in strižnih preizkusov lezenja, ki temeljijo na natezni in rotacijski reometriji. Določene so bile natezna, strižna in stisljivostna podajnost ter pripadajoče standardne in razširjene merilne negotovosti v skladu s smernicami JCGM 100:2008. Rezultati kažejo, da negotovosti tipa A najbolj prispevajo k skupni standardni negotovosti, pri čemer so relativne razširjene negotovosti znašale približno 3 % za strižno podajnost in do 25 % za stisljivostno podajnost. Raziskava opredeljuje glavne vire negotovosti in predlaga strategije za njihovo zmanjšanje, vključno s povečanjem števila ponovitev meritev in izboljšanjem nadzora okoljskih pogojev. Predstavljeno je celovito vrednotenje negotovosti pri določanju viskoelastičnih materialnih funkcij na podlagi lezenja, kar zagotavlja zanesljivejše vhodne podatke za numerične simulacije. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Mechanical Engineering / Strojniški Vestnik is the property of University of Ljubljana, Faculty of Mechanical Engineering, Journal of Mechanical Engineering and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene. – Name: TitleAlt Label: Alternate Title Group: TiAlt Data: Vrednotenje merilne negotovosti pri določanju viskoelastičnih materialnih funkcij polipropilena na osnovi preizkusov lezenja. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kotnik%2C+Urban%22">Kotnik, Urban</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Oseli%2C+Alen%22">Oseli, Alen</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kutin%2C+Jože%22">Kutin, Jože</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Halilovič%2C+Miroslav%22">Halilovič, Miroslav</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Slemenik+Perše%2C+Lidija%22">Slemenik Perše, Lidija</searchLink><relatesTo>1</relatesTo><i> lidija.slemenik.perse@fs.uni-lj.si</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Mechanical+Engineering+%2F+Strojniški+Vestnik%22">Journal of Mechanical Engineering / Strojniški Vestnik</searchLink>. 2026, Vol. 72 Issue 1/2, p21-28. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Measurement+uncertainty+%28Statistics%29%22">Measurement uncertainty (Statistics)</searchLink><br /><searchLink fieldCode="DE" term="%22Creep+testing%22">Creep testing</searchLink><br /><searchLink fieldCode="DE" term="%22Polypropylene%22">Polypropylene</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Viscometry%22">Viscometry</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoelastic+materials%22">Viscoelastic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoelasticity%22">Viscoelasticity</searchLink> – Name: Abstract Label: Abstract (English) Group: Ab Data: 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. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Abstract (Slovak) Group: Ab Data: Sodobni numerični modeli uporabljajo časovno odvisne materialne parametre kot vhodne podatke za simulacijo viskoelastičnega odziva polimerov. Zanesljivost numeričnih napovedi je zato odvisna od točnosti določitve teh parametrov. Razumevanje merilne negotovosti, povezane z njihovo identifikacijo, je ključnega pomena za oceno pričakovanega razpona in zanesljivosti rezultatov simulacij. Čeprav so analize negotovosti na podlagi lezenja za druge materiale že znane, so vrednotenja negotovosti za polimere, ki zahtevajo določitev več viskoelastičnih materialnih funkcij, še vedno redka, obstoječe raziskave polimerov pa temeljijo predvsem na relaksacijskih preizkusih. Ta raziskava eksperimentalno analizira viskoelastično vedenje polipropilena pri 60 °C s pomočjo nateznih in strižnih preizkusov lezenja, ki temeljijo na natezni in rotacijski reometriji. Določene so bile natezna, strižna in stisljivostna podajnost ter pripadajoče standardne in razširjene merilne negotovosti v skladu s smernicami JCGM 100:2008. Rezultati kažejo, da negotovosti tipa A najbolj prispevajo k skupni standardni negotovosti, pri čemer so relativne razširjene negotovosti znašale približno 3 % za strižno podajnost in do 25 % za stisljivostno podajnost. Raziskava opredeljuje glavne vire negotovosti in predlaga strategije za njihovo zmanjšanje, vključno s povečanjem števila ponovitev meritev in izboljšanjem nadzora okoljskih pogojev. Predstavljeno je celovito vrednotenje negotovosti pri določanju viskoelastičnih materialnih funkcij na podlagi lezenja, kar zagotavlja zanesljivejše vhodne podatke za numerične simulacije. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Mechanical Engineering / Strojniški Vestnik is the property of University of Ljubljana, Faculty of Mechanical Engineering, Journal of Mechanical Engineering and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.5545/sv-jme.2025.1548 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 21 Subjects: – SubjectFull: Measurement uncertainty (Statistics) Type: general – SubjectFull: Creep testing Type: general – SubjectFull: Polypropylene Type: general – SubjectFull: Computer simulation Type: general – SubjectFull: Viscometry Type: general – SubjectFull: Viscoelastic materials Type: general – SubjectFull: Viscoelasticity Type: general Titles: – TitleFull: Evaluation of Measurement Uncertainty in Creep-Based Determination of Viscoelastic Material Functions of Polypropylene. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kotnik, Urban – PersonEntity: Name: NameFull: Oseli, Alen – PersonEntity: Name: NameFull: Kutin, Jože – PersonEntity: Name: NameFull: Halilovič, Miroslav – PersonEntity: Name: NameFull: Slemenik Perše, Lidija IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00392480 Numbering: – Type: volume Value: 72 – Type: issue Value: 1/2 Titles: – TitleFull: Journal of Mechanical Engineering / Strojniški Vestnik Type: main |
| ResultId | 1 |
