Alternative dynamic torsion test to evaluate the elastic modulus of polymers

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dc.contributor.authorPiedade, Lucas Pereira [UNESP]
dc.contributor.authorPintao, Carlos Alberto Fonzar [UNESP]
dc.contributor.authorFoschini, Cesar Renato [UNESP]
dc.contributor.authorSilva, Marcos Ribeiro da [UNESP]
dc.contributor.authorAzevedo Neto, Nilton Francelosi [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2021-06-25T12:20:16Z
dc.date.available2021-06-25T12:20:16Z
dc.date.issued2020-09-01
dc.description.abstractThis work presents an alternative for the determination of the torsion modulus, G, of polymers. These materials may be subjected to shear stresses in some structural applications; thereby, the knowledge of G is of great interest. For this purpose, a mechanical system featuring a simplified torsion pendulum version and a rotational motion sensor (RMS) coupled to it was used to establish an angular position as a function of time. The applied technique is considered non-destructive and makes it possible to obtain G without the Poisson's ratio through an equation derived from mechanical spectroscopy and material strength. The main goal is to present and validate the employment of this method for polymers. Therefore, circular cross-sectional samples of extruded polytetrafluoroethylene (PTFE) were subjected to torsional stresses, in which a physical and quantitative explanation is given for the frequency and G curves as a function of the prefixed rotational inertia (I), length (L), and diameter (d). Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were also made to ensure the reliability of data. It is possible to establish an L/d ratio, which explains why G converges to a single value when the sample dimensions are different from each other. It was found that G is approximately 350 MPa for an L/d ratio equivalent to 10.64. Such a value is within limits found in the literature, opening the possibility of assessing other polymers.en
dc.description.affiliationSao Paulo State Univ, Sch Engn FEB, Mech Engn Dept, BR-17033360 Bauru, SP, Brazil
dc.description.affiliationSao Paulo State Univ, Sch Sci FC, Dept Phys, BR-17033360 Bauru, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Sch Engn FEB, Mech Engn Dept, BR-17033360 Bauru, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Sch Sci FC, Dept Phys, BR-17033360 Bauru, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 2007/04094-9
dc.description.sponsorshipIdFAPESP: 2017/08820-8
dc.description.sponsorshipIdFAPESP: 2018/12463-9
dc.description.sponsorshipIdCAPES: 024/2012
dc.description.sponsorshipIdCAPES: 011/2009
dc.format.extent16
dc.identifierhttp://dx.doi.org/10.1088/2053-1591/abb560
dc.identifier.citationMaterials Research Express. Bristol: Iop Publishing Ltd, v. 7, n. 9, 16 p., 2020.
dc.identifier.doi10.1088/2053-1591/abb560
dc.identifier.lattes1922357184842767
dc.identifier.orcid0000-0003-1300-4978
dc.identifier.urihttp://hdl.handle.net/11449/209494
dc.identifier.wosWOS:000573883200001
dc.language.isoeng
dc.publisherIop Publishing Ltd
dc.relation.ispartofMaterials Research Express
dc.sourceWeb of Science
dc.subjecttorsion modulus
dc.subjectmechanical spectroscopy
dc.subjecttorsion pendulum
dc.subjectpolytetrafluoroethylene (PTFE)
dc.subjectmechanical characterization
dc.titleAlternative dynamic torsion test to evaluate the elastic modulus of polymersen
dc.typeArtigo
dcterms.licensehttp://iopscience.iop.org/page/copyright
dcterms.rightsHolderIop Publishing Ltd
unesp.author.lattes1922357184842767[3]
unesp.author.orcid0000-0002-9850-9977[4]
unesp.author.orcid0000-0003-1300-4978[3]
unesp.departmentFísica - FCpt

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Artigos - Engenharia Mecânica - FEB
Bauru - FC - Faculdade de Ciências