A constitutive model for thermoplastics based on two temperatures

Das, Sanhita; Chowdhury, Shubhankar Roy; Roy, Debasish

doi:10.1016/j.euromechsol.2018.06.010

Cited by 10 publications

(3 citation statements)

References 46 publications

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“…Diani [54] described the elastic deformation of thermoplastic elastomers in a novel way, but also based on models of hyperelastic deformations. Das [55] developed a constitutive model based on the temperatures of two characteristic thermodynamic points for rubber-like materials. Eberlein [56] described the properties of the polyurethane thermoplastic elastomer TPU with a model of a non-linearly elastic-plastic material, but only in the range of standard environment temperature.…”

Section: Materials Conditionsmentioning

confidence: 99%

Experimental approach to modeling of the plasticizing operation in the hot plate welding process

Wałęsa

Talaśka

Wilczyński

et al. 2021

Archiv.Civ.Mech.Eng

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The paper discusses the topic of butt welding of polyurethane drive belts by the hot plate method in the context of modeling the process of this technological operation. Based on the analysis of the butt welding process, a series of studies of the thermomechanical properties of the material from which the belt is made has been planned. The results will be used for mathematical modeling of the welding process, and in particular its most important phase: the plasticizing operation. On this basis, the study of the compression of cylindrical specimens taken from the belt has been performed at two different speeds. Their result is the relationship between the compressive stress σc and the modulus of longitudinal elasticity Ec at compression and: deformation εc, temperature value T, as well as the compressive velocity vc. In the next step, dynamic viscosity η of the belt material was determined based on the results of dynamic thermomechanical analysis. The research work culminated in the attempts to plasticize the material on a hot plate, in conditions similar to the process of industrial welding. These studies were performed at different speeds vpl, resulting in the correlation between the force required for plasticizing Fpl and the value of the speed of the belt end vpl relative to the hot plate heated to a temperature Tp. The obtained results will be used to formulate a mathematical model of plasticizing the material, based on the selected mechanical deformation models.

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Section: Materials Conditionsmentioning

confidence: 99%

Experimental approach to modeling of the plasticizing operation in the hot plate welding process

Wałęsa

Talaśka

Wilczyński

et al. 2021

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

show abstract

“…This case, only a single parameter was perturbed with δ P relative parameter error of �1%; �2% � 5% and � 10%, and the resulted curves was compared using standard error of regression as in Eq. (19). The resultant curves are presented in Figs.…”

Section: Parameter-sensitivitymentioning

confidence: 99%

“…In addition, recent studies have also proposed viscoelastic and viscoplastic models for modelling temperature-dependent behaviour of various thermoplastic materials (including PLA and PVA core-shell nano fibres, PMMA, PLA, PC and isotactic PP) using parallel and serial configurations of the well-known rheological models combined with nonlinear viscoelastic-viscoplastic elements [9][10][11][12][13][14][15][16][17][18]. Whereas, the novel constitutive model proposed for temperature-dependent structural relaxation by Das et al [19] also includes multiple time-scales using statistical homogenization. Additionally, several studies investigated the yielding behaviour of thermoplastics based on cyclic tests utilizing kinematic hardening approach [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Performance of a parallel viscoelastic-viscoplastic model for a microcellular thermoplastic foam on wide temperature range

Berezvai

Kossa

2020

Polymer Testing

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This paper is concerned with the experimental testing and the constitutive modelling of a thermoplastic microcellular polyethylene-terephthalate (MC-PET) foam on the temperature range of 21-210 � C in order to investigate the temperature-dependent performance of the applied parallel viscoelastic-viscoplastic material model. By means of carefully designed uniaxial mechanical tests in temperature chamber, the viscous, elastic and yielding behaviours of the investigated material are identified, which are then applied for selecting suitable viscoelastic-viscoplastic constitutive models. The material characterization process is conducted using finiteelement-based fitting method, including also the analysis of the applied numerical optimization algorithm. The fitting results are used to analyse the parameter sensitivity and to propose closed-form analytical relations for the temperature dependency of the material parameters. Finally, the utilisation of the analytical temperature functions for speeding up the parameter-fitting process is also demonstrated.

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Finite deformation constitutive model for macro-yield behavior of amorphous glassy polymers with a molecular entanglement-based internal-state variable

Jiang

2019

International Journal of Mechanical Sciences

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A constitutive model for thermoplastics based on two temperatures

Cited by 10 publications

References 46 publications

Experimental approach to modeling of the plasticizing operation in the hot plate welding process

Experimental approach to modeling of the plasticizing operation in the hot plate welding process

Performance of a parallel viscoelastic-viscoplastic model for a microcellular thermoplastic foam on wide temperature range

Finite deformation constitutive model for macro-yield behavior of amorphous glassy polymers with a molecular entanglement-based internal-state variable

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