Alternative dynamic torsion test to evaluate the elastic modulus of polymers
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1088/2053-1591/abb560 http://hdl.handle.net/11449/209494 |
Resumo: | This 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. |
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Alternative dynamic torsion test to evaluate the elastic modulus of polymerstorsion modulusmechanical spectroscopytorsion pendulumpolytetrafluoroethylene (PTFE)mechanical characterizationThis 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Sao Paulo State Univ, Sch Engn FEB, Mech Engn Dept, BR-17033360 Bauru, SP, BrazilSao Paulo State Univ, Sch Sci FC, Dept Phys, BR-17033360 Bauru, SP, BrazilSao Paulo State Univ, Sch Engn FEB, Mech Engn Dept, BR-17033360 Bauru, SP, BrazilSao Paulo State Univ, Sch Sci FC, Dept Phys, BR-17033360 Bauru, SP, BrazilFAPESP: 2007/04094-9FAPESP: 2017/08820-8FAPESP: 2018/12463-9CAPES: 024/2012CAPES: 011/2009Iop Publishing LtdUniversidade Estadual Paulista (Unesp)Piedade, Lucas Pereira [UNESP]Pintao, Carlos Alberto Fonzar [UNESP]Foschini, Cesar Renato [UNESP]Silva, Marcos Ribeiro da [UNESP]Azevedo Neto, Nilton Francelosi [UNESP]2021-06-25T12:20:16Z2021-06-25T12:20:16Z2020-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article16http://dx.doi.org/10.1088/2053-1591/abb560Materials Research Express. Bristol: Iop Publishing Ltd, v. 7, n. 9, 16 p., 2020.http://hdl.handle.net/11449/20949410.1088/2053-1591/abb560WOS:00057388320000119223571848427670000-0003-1300-4978Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Research Expressinfo:eu-repo/semantics/openAccess2024-06-28T13:54:50Zoai:repositorio.unesp.br:11449/209494Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:27:47.108082Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
title |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
spellingShingle |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers Piedade, Lucas Pereira [UNESP] torsion modulus mechanical spectroscopy torsion pendulum polytetrafluoroethylene (PTFE) mechanical characterization |
title_short |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
title_full |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
title_fullStr |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
title_full_unstemmed |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
title_sort |
Alternative dynamic torsion test to evaluate the elastic modulus of polymers |
author |
Piedade, Lucas Pereira [UNESP] |
author_facet |
Piedade, Lucas Pereira [UNESP] Pintao, Carlos Alberto Fonzar [UNESP] Foschini, Cesar Renato [UNESP] Silva, Marcos Ribeiro da [UNESP] Azevedo Neto, Nilton Francelosi [UNESP] |
author_role |
author |
author2 |
Pintao, Carlos Alberto Fonzar [UNESP] Foschini, Cesar Renato [UNESP] Silva, Marcos Ribeiro da [UNESP] Azevedo Neto, Nilton Francelosi [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Piedade, Lucas Pereira [UNESP] Pintao, Carlos Alberto Fonzar [UNESP] Foschini, Cesar Renato [UNESP] Silva, Marcos Ribeiro da [UNESP] Azevedo Neto, Nilton Francelosi [UNESP] |
dc.subject.por.fl_str_mv |
torsion modulus mechanical spectroscopy torsion pendulum polytetrafluoroethylene (PTFE) mechanical characterization |
topic |
torsion modulus mechanical spectroscopy torsion pendulum polytetrafluoroethylene (PTFE) mechanical characterization |
description |
This 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. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-09-01 2021-06-25T12:20:16Z 2021-06-25T12:20:16Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1088/2053-1591/abb560 Materials Research Express. Bristol: Iop Publishing Ltd, v. 7, n. 9, 16 p., 2020. http://hdl.handle.net/11449/209494 10.1088/2053-1591/abb560 WOS:000573883200001 1922357184842767 0000-0003-1300-4978 |
url |
http://dx.doi.org/10.1088/2053-1591/abb560 http://hdl.handle.net/11449/209494 |
identifier_str_mv |
Materials Research Express. Bristol: Iop Publishing Ltd, v. 7, n. 9, 16 p., 2020. 10.1088/2053-1591/abb560 WOS:000573883200001 1922357184842767 0000-0003-1300-4978 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials Research Express |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
16 |
dc.publisher.none.fl_str_mv |
Iop Publishing Ltd |
publisher.none.fl_str_mv |
Iop Publishing Ltd |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128935524827136 |