On the modelling of highly elastic flows of amorphous thermoplastics

Figiel, Łukasz; Buckley, C. P.

doi:10.1016/j.ijnonlinmec.2009.01.005

Cited by 19 publications

(29 citation statements)

References 33 publications

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“…Our method conformed to that classified by Figiel and Buckley,6 as approach II, case 2 0 . Here, we assumed that all of the rigid body rotation was included in the plastic deformation.…”

Section: Constitutive Modelingsupporting

confidence: 62%

Modeling the tensile behavior of ultra‐high‐molecular‐weight polyethylene with a novel flow rule

Sweeney

Naz

Coates

2011

J of Applied Polymer Sci

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A study of the tensile behavior of ultrahigh-molecular-weight polyethylene over a range of strain rates showed that its strain rate sensitivity was a function of the strain. This was related to a flow rule developed for this material in a previous study on compressive behavior. This flow rule is an adaptation of that of Hill, in which the anisotropy coefficients are power-law functions of the extension ratios. It is used in conjunction with an Eyring process. The observed rate dependence of the tensile behavior conformed with that obtained with the power-law flow rule and could be used to derive a value of the power-law coefficient. Independent observations were made of the relationship between the axial and transverse strains in tensile specimens with inhomogeneous strain fields. A constitutive model was developed that incorporates the new flow rule and was implemented in a finite element analysis. When this analysis was used to model the inhomogeneous tensile specimens, it gave predictions of the axial and transverse strain that were consistent with the experiment when the power-law coefficient was the same value as that derived from the study of the rate dependence.

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“…Our method conformed to that classified by Figiel and Buckley,6 as approach II, case 2 0 . Here, we assumed that all of the rigid body rotation was included in the plastic deformation.…”

Section: Constitutive Modelingsupporting

confidence: 62%

Modeling the tensile behavior of ultra‐high‐molecular‐weight polyethylene with a novel flow rule

Sweeney

Naz

Coates

2011

J of Applied Polymer Sci

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“…Inspired from Figiel and Buckley's work , Chevalier et al . have recently proposed a nonlinear incompressible visco‐hyperelastic model to represent the complex constitutive behavior of PET.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Injection Stretch Blow Molding Process: An Anisotropic Visco‐Hyperelastic Model for Polyethylene Terephthalate Behavior

Luo

Chevalier

Monteiro

et al. 2020

Polymer Engineering & Sci

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The mechanical behavior of polyethylene terephthalate (PET) under the severe loading conditions of the injection stretch blow molding process is strongly dependent on strain rate, strain, and temperature. In this process, the PET near the glass‐transition temperature (Tg) highlights a strongly nonlinear elastic and viscous behavior. In the author's previous works, a nonlinear visco‐hyperelastic model has been build and identified from equi‐biaxial tensile experimental results. Despite the good agreement with biaxial test results, the model fails to reproduce the sequential biaxial test (with constant width during first step) and the shape evolution during the free blowing of preforms. In this work, an anisotropic version of this visco‐hyperelastic model is proposed and identified form both equi and constant width results. The new version of the nonlinear visco‐hyperelastic model is implemented into the Abaqus environment and used to simulate the free‐blowing process. The comparison with the experimental results managed in Queen's University of Belfast validates the approach in terms of bubble shape and thickness distribution. POLYM. ENG. SCI., 60:823–831, 2020. © 2020 Society of Plastics Engineers

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“…Shojaei and Li 43 incorporated the damage effects into viscoplastic model which showed the potential to model the shape memory performance of various types of polymers. The constitutive models developed for thermoplastic materials below the glass transition temperature [44][45][46][47][48] can be extended to model the thermoplastic SMPs. Nevertheless, the majority of these models cannot capture important features of thermoplastic SMPs, such as the unrecoverable strain.…”

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confidence: 99%

A predictive parameter for the shape memory behavior of thermoplastic polymers

Yakacki¹,

Guo²,

Frick³

et al. 2016

J Polym Sci B Polym Phys

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We present an experimental and modeling study of the effect of programming conditions on the shape‐memory behaviors of amorphous thermoplastic polymers. Experimentally we measure the influence of deformation temperature, strain rate and relaxation time on the thermomechanical properties and shape‐memory response of poly(para‐phenylene), which is a stiff and strong aromatic thermoplastic. To understand the underlying mechanism, we develop a viscoelastic model, which contains multiple discrete relaxation processes with broad distribution of relaxation time. The model parameters of the relaxation spectrum are obtained from the master curve of small strain–stress relaxation tests using time‐temperature superposition. The model predictions show good agreement with experimental observations, including the stress response and shape‐memory response under various conditions. We applied the model to study the effect of the programming conditions on the shape recovery performance. The results show that the relaxation modulus at the end of the programming process was a predictor of the recovery speed and recoverable strain ratio. This provides a design metric to optimize the shape programming process for shape recovery. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1405–1414

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On the modelling of highly elastic flows of amorphous thermoplastics

Cited by 19 publications

References 33 publications

Modeling the tensile behavior of ultra‐high‐molecular‐weight polyethylene with a novel flow rule

Modeling the tensile behavior of ultra‐high‐molecular‐weight polyethylene with a novel flow rule

Simulation of the Injection Stretch Blow Molding Process: An Anisotropic Visco‐Hyperelastic Model for Polyethylene Terephthalate Behavior

A predictive parameter for the shape memory behavior of thermoplastic polymers

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