Viscoplasticité du polycarbonate aux vitesses de sollicitations élevées

Steer, Philippe; Rietsch, F.

doi:10.1016/0014-3057(88)90118-8

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Split-Hopkinson bar testing has been employed to study the yield and post-yield behavior of polymers at very high strain rates (>1000 s À1 ) (Kolsky, 1949;Rietsch and Bouette, 1990;Walley and Field, 1994;Moy et al, 2003;Cady et al, 2003;Swallowe and Lee, 2003). The two-process Ree-Eyring yield model has been used extensively to capture material yield behavior over very large ranges in temperature and strain rate (Haussy et al, 1980;Foot et al, 1987;Steer and Rietsch, 1988;Rietsch and Bouette, 1990), where calculated activation energy values have confirmed BauwensÕ hypothesis concerning the connection between viscoelastic and yield behavior transitions (Foot et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Mechanics of the rate-dependent elastic–plastic deformation of glassy polymers from low to high strain rates

Mulliken

Boyce

2006

International Journal of Solids and Structures

605

468

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A combined experimental and analytical investigation has been performed to understand the mechanical behavior of two amorphous polymers-polycarbonate and poly(methyl methacrylate)-at strain rates ranging from 10 À4 to 10 4 s À1 . This range in strain rates was achieved in uniaxial tension and compression tests using a dynamic mechanical analyzer (DMA), a servo-hydraulic testing machine, and an aluminum split-Hopkinson pressure bar. DMA tension tests were used to characterize the viscoelastic behavior of these materials, with focus on the rate-dependent shift of material transition temperatures. Uniaxial compression tests on the servo-hydraulic machine (10 À4 to 1 s À1 ) and the split-Hopkinson pressure bar (10 3 to 10 4 s À1 ) were used to characterize the rate-dependent yield and post-yield behavior. Both materials were observed to exhibit increased rate sensitivity of yield under the same strain rate/temperature conditions as the btransition of the viscoelastic behavior. A physically based constitutive model for large strain deformation of thermoplastics was then extended to encompass high-rate conditions. The model accounts for the contributions of different molecular motions which become operational and important in different frequency regimes. The new features enable the model to not only capture the transition in the yield behavior, but also accurately predict the post-yield, large strain behavior over a wide range of temperatures and strain rates.

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Section: Introductionmentioning

confidence: 99%

Mechanics of the rate-dependent elastic–plastic deformation of glassy polymers from low to high strain rates

Mulliken

Boyce

2006

International Journal of Solids and Structures

605

468

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“…The modified-Eyring equation was used to fit compression yield stress of polyetheretherketone (PEEK). The temperature and strain rate sensitivity of PC's yield stress were mostly fitted by the Ree-Eyring equation [4,5,43,44] or the cooperative model [9,45,46]. Safari et al [37] argued for the activation of a third relaxation process and then used a modified Ree-Eyring equation.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Strain Rate Dependency of Polycarbonate’s Yield Stress: Evaluation of Four Constitutive Equations

Al-Juaid

Othman

2016

Journal of Engineering

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The main focus of this paper is in evaluating four constitutive relations which model the strain rate dependency of polymers yield stress. Namely, the two-term power-law, the Ree-Eyring, the cooperative, and the newly modified-Eyring equations are used to fit tensile and compression yield stresses of polycarbonate, which are obtained from the literature. The four equations give good agreement with the experimental data. Despite using only three material constants, the modified-Eyring equation, which considers a strain rate-dependent activation volume, gives slightly worse fit than the three other equations. The two-term power-law and the cooperative equation predict a progressive increase in the strain rate sensitivity of the yield stress. Oppositely, the Ree-Eyring and the modified-Eyring equations show a clear transition between the low and high strain rate ranges. Namely, they predict a linear dependency of the yield stress in terms of the strain rate at the low strain rate range. Crossing a threshold strain rate, the yield stress sensitivity sharply increases as the strain rate increases. Hence, two different behaviors were observed though the four equations fit well the experimental data. More experimental data, mainly at the intermediate strain rate range, are needed to conclude which, of the two behaviors, is more appropriate for polymers.

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The compression yield behaviour of polycarbonate over a wide range of strain rates and temperatures

Rietsch

Bouette

1990

European Polymer Journal

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Viscoplasticité du polycarbonate aux vitesses de sollicitations élevées

Cited by 4 publications

References 9 publications

Mechanics of the rate-dependent elastic–plastic deformation of glassy polymers from low to high strain rates

Mechanics of the rate-dependent elastic–plastic deformation of glassy polymers from low to high strain rates

Modeling of the Strain Rate Dependency of Polycarbonate’s Yield Stress: Evaluation of Four Constitutive Equations

The compression yield behaviour of polycarbonate over a wide range of strain rates and temperatures

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