Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate)
The viscoelastic nature of the Poisson’s ratio of a semicrystalline poly (butylene terephthalate) is highlighted by investigating its dependence on time, temperature and strain rate, under two types of loading conditions: i) constant deformation rate tests, in which the transverse strain i...
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| Format: | Article |
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| Language: | English |
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Budapest University of Technology and Economics
2011-08-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0002245&mi=cd |
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| description | The viscoelastic nature of the Poisson’s ratio of a semicrystalline poly (butylene terephthalate) is highlighted by investigating its dependence on time, temperature and strain rate, under two types of loading conditions: i) constant deformation rate tests, in which the transverse strain is measured in tensile ramps at various temperatures and at two strain rates; and ii) constant deformation tests, in which, under a constant axial deformation, the transverse strain is measured as a function of time in isothermal experiments performed at various temperatures. In both testing configurations, axial and transverse deformations are measured by means of a biaxial contact extensometer, and a correction procedure is adopted in order to compensate the lateral penetration of the extensometer knives. Poisson’s ratio displays the typical features of a retardation function, increasing with time and temperature, and decreasing with strain rate. This behaviour has been compared to that of simultaneously measured relaxation modulus. |
| format | Article |
| id | doaj-art-db3d850054944cf38fddf13003de7116 |
| institution | DOAJ |
| issn | 1788-618X |
| language | English |
| publishDate | 2011-08-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-db3d850054944cf38fddf13003de71162025-08-20T02:51:19ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2011-08-015868569710.3144/expresspolymlett.2011.67Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate)The viscoelastic nature of the Poisson’s ratio of a semicrystalline poly (butylene terephthalate) is highlighted by investigating its dependence on time, temperature and strain rate, under two types of loading conditions: i) constant deformation rate tests, in which the transverse strain is measured in tensile ramps at various temperatures and at two strain rates; and ii) constant deformation tests, in which, under a constant axial deformation, the transverse strain is measured as a function of time in isothermal experiments performed at various temperatures. In both testing configurations, axial and transverse deformations are measured by means of a biaxial contact extensometer, and a correction procedure is adopted in order to compensate the lateral penetration of the extensometer knives. Poisson’s ratio displays the typical features of a retardation function, increasing with time and temperature, and decreasing with strain rate. This behaviour has been compared to that of simultaneously measured relaxation modulus.http://www.expresspolymlett.com/letolt.php?file=EPL-0002245&mi=cdMaterial testingMechanical propertiesViscoelasticityPoisson s ratio |
| spellingShingle | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) eXPRESS Polymer Letters Material testing Mechanical properties Viscoelasticity Poisson s ratio |
| title | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) |
| title_full | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) |
| title_fullStr | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) |
| title_full_unstemmed | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) |
| title_short | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) |
| title_sort | time and temperature effects on poisson 8217 s ratio of poly butylene terephthalate |
| topic | Material testing Mechanical properties Viscoelasticity Poisson s ratio |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0002245&mi=cd |