Nonlinear creep behavior of viscoelastic polycarbonate

Jazouli, Said; Luo, Wenbo; Brémand, Fabrice; Vu‐Khanh, Toan

doi:10.1007/s10853-005-2276-1

Cited by 37 publications

(15 citation statements)

References 13 publications

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“…For nonlinear viscoelastic solids, however, the shear creep compliance varies with the applied stress. Jazouli et al [16] studied the nonlinear creep behavior of polycarbonate (PC) via uniaxial tensile creep tests at different stress levels and found that the creep compliance increases with the applied stress. Tweedie et al [9] observed that the assumption of linear viscoelasticity breaks down for several polymers (including polycarbonate and polypropylene) when creep compliance is measured via conical indentation.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation creep of nonlinear viscoelastic polypropylene

Peng

Feng

et al. 2015

Polymer Testing

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a b s t r a c tUniaxial tensile creep tests at various applied stresses were carried out to demonstrate that PP is nonlinear viscoelastic. A novel phenomenological model consisting of springs, dashpots, stress-locks and sliders was proposed to describe the nonlinear viscoelasticity. Indentation creep tests at different applied load levels were also performed on nonlinear viscoelastic PP. It was found that the shear creep compliance varies with the applied load level when the applied load is less than 5 mN, which means the indentation creep behavior was nonlinear. To find the real reason for the nonlinearity in indentation creep tests, the elastic modulus at various indentation depths was measured using continuous stiffness measurements (CSM). By analyzing the variation of elastic modulus with indentation depth, the nonlinearity of indentation creep behavior was proved to be caused by the non-uniform properties in the surface of the specimen rather than nonlinear viscoelasticity.

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Section: Introductionmentioning

confidence: 99%

Nanoindentation creep of nonlinear viscoelastic polypropylene

Peng

Feng

et al. 2015

Polymer Testing

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“…Direct measurements of Poisson's ratio has been carried out on polymeric materials by different types of experiments, in which the axial deformation was applied through a constant rate loading ramp [12][13][14][15], under a constant load (creep) [13,[16][17], under constant strain (stress relaxation) [10,14,18], or under sinusoidal loading-unloading (dynamicmechanical analysis) [19][20][21]. An accurate measurement of the transverse strains is of crucial importance and various techniques have been employed, such as optical methods (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…An accurate measurement of the transverse strains is of crucial importance and various techniques have been employed, such as optical methods (i.e. Moirè interferometry [10,[17][18] and video extensometry [13,16]), bonded strain gages [19][20] [22]). In a work on epoxy resins we have also reported Poisson's ratio as increasing with time, temperature and strain, and decreasing with strain rate [14].…”

Section: Introductionmentioning

confidence: 99%

Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate)

Pandini¹,

Pegoretti²

2011

Express Polym. Lett.

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Abstract. 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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“…Nevertheless, a marked dependence of the Poisson's ratio on strain, temperature, time, and frequency was experimentally evidenced [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Investigations were carried out by measuring Poisson's ratio both in a direct way, in which the transverse and axial deformations are concurrently measured, or in an indirect way, where Poisson's ratio is derived from the measurement of two different material's viscoelastic constants.…”

Section: Introductionmentioning

confidence: 99%

“…Investigations were carried out by measuring Poisson's ratio both in a direct way, in which the transverse and axial deformations are concurrently measured, or in an indirect way, where Poisson's ratio is derived from the measurement of two different material's viscoelastic constants. Direct measurement can be performed by employing several methodologies, such as optical methods [3,7,14,15,17], through strain gages [13,18] or contact extensometers [10]. This latter experimental set-up is not recommended by Tschoegl et al [3], due to the direct contact with the specimen, but nonetheless good results were obtained by Arzoumanidis and Liechti by means of a biaxial extensometer [10].…”

Section: Introductionmentioning

confidence: 99%

Time, temperature, and strain effects on viscoelastic Poisson's ratio of epoxy resins

Pandini

Pegoretti

2008

Polymer Engineering & Sci

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Poisson's ratio of polymeric materials, although generally assumed as a constant, is known to display a viscoelastic dependence on time, temperature, and strain. This article investigates the phenomenology of this dependence on two crosslinked epoxy systems with different glass transition temperatures. Poisson's ratio measurements are performed by contact extensometers simultaneously measuring the axial and transverse deformations under two different tensile testing conditions: (i) constant deformation rate, in which the effects of strain, strain rate, and temperature are highlighted; (ii) stress relaxation (or constant deformation), where the dependence of Poisson's ratio on time is studied at various strain levels. The viscoelastic Poisson's ratio increases as strain, temperature, and time increases, with trends markedly depending on the materials glass transition

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Nonlinear creep behavior of viscoelastic polycarbonate

Cited by 37 publications

References 13 publications

Nanoindentation creep of nonlinear viscoelastic polypropylene

Nanoindentation creep of nonlinear viscoelastic polypropylene

Time and temperature effects on Poisson’s ratio of poly(butylene terephthalate)

Time, temperature, and strain effects on viscoelastic Poisson's ratio of epoxy resins

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