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.
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Titolo: | Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate) | |
Autori: | Pandini, Stefano; Pegoretti, Alessandro | |
Autori Unitn: | ||
Titolo del periodico: | EXPRESS POLYMER LETTERS | |
Anno di pubblicazione: | 2011 | |
Numero e parte del fascicolo: | 8 | |
Codice identificativo Scopus: | 2-s2.0-79957940517 | |
Codice identificativo WOS: | WOS:000291045900004 | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.3144/expresspolymlett.2011.67 | |
Handle: | http://hdl.handle.net/11572/85384 | |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |