Modeling the large‐strain constitutive behavior of polycarbonate under isothermal and anisothermal conditions

Sweeney, J.; Caton‐Rose, P.; Coates, Phil

doi:10.1002/app.21681

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…The force-extension data was regressed using industry standard spreadsheet software to provide plots of stress versus strain for the samples that were tested. [2,3,4,5,6,7,8,9,10] model. This model will now be discussed as it is one of the major themes of this document.…”

Section: Biaxial Testingmentioning

confidence: 99%

“…The models were constructed using the Finite Element Analysis software ABAQUS [11] . The material model chosen was that proposed by Sweeney et al [2,3,4,5,6,7,8,9,10] . Using this theory a 'user subroutine' was developed at QUB describing the behaviour of the Sweeney model such that it could be used in conjunction with ABAQUS to facilitate the research.…”

Section: The Sweeney Modelmentioning

confidence: 99%

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Viscoelastic Material Models of Polypropylene for Thermoforming Applications

O'Connor¹,

Martin²,

Menary³

2010

Int J Mater Form

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Polypropylene (PP), a semi-crystalline material, is typically solid phase thermoformed at temperatures associated with crystalline melting, generally in the 150° to 160° Celsius range. In this very narrow thermoforming window the mechanical properties of the material rapidly decline with increasing temperature and these large changes in properties make Polypropylene one of the more difficult materials to process by thermoforming. Measurement of the deformation behaviour of a material under processing conditions is particularly important for accurate numerical modelling of thermoforming processes. This paper presents the findings of a study into the physical behaviour of industrial thermoforming grades of Polypropylene. Practical tests were performed using custom built materials testing machines and thermoforming equipment at Queen's University Belfast. Numerical simulations of these processes were constructed to replicate thermoforming conditions using industry standard Finite Element Analysis software, namely ABAQUS and custom built user material model subroutines. Several variant constitutive models were used to represent the behaviour of the Polypropylene materials during processing. This included a range of phenomenological, rheological and blended constitutive models. The paper discusses approaches to modelling industrial plug-assisted thermoforming operations using Finite Element Analysis techniques and the range of material models constructed and investigated. It directly compares practical results to numerical predictions. The paper culminates discussing the learning points from using Finite Element Methods to simulate the plug-assisted thermoforming of Polypropylene, which presents complex contact, thermal, friction and material modelling challenges.The paper makes recommendations as to the relative importance of these inputs in general terms with regard to correlating to experimentally gathered data. The paper also presents recommendations as to the approaches to be taken to secure simulation predictions of improved accuracy.

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Section: Biaxial Testingmentioning

confidence: 99%

Section: The Sweeney Modelmentioning

confidence: 99%

Viscoelastic Material Models of Polypropylene for Thermoforming Applications

O'Connor¹,

Martin²,

Menary³

2010

Int J Mater Form

View full text Add to dashboard Cite

show abstract

Process structuring of polymers by solid phase orientation processing

et al. 2013

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Strain rate and temperature dependence of the mechanical properties of polymers: A universal time-temperature superposition principle

Wei

Shen

Chen

et al. 2018

The Journal of Chemical Physics

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Establishing the Time-Temperature and Frequency-Temperature Superposition Principles (TTSP and FTSP) to describe the mechanical behavior of polymeric materials is always of paramount significance. In this work, by adopting the classic coarse-grained model, we investigate the validity of these superposition principles for a series of networks, such as the pure polymer network, interpenetrating polymer networks composed of stiff and flexible networks (IPNs-SF), interpenetrating polymer networks composed of different cross-linking networks (IPNs-DC), polymer nanocomposites (PNCs), and surface grafted modified PNCs. The study focuses on the three critical mechanical properties such as the stress relaxation, the storage modulus versus the frequency obtained from the dynamic periodic shear deformation, and the uniaxial tensile stress-strain. The glass transition temperature (T) is about 0.47 for the simulated polymer network (CL400), and a smooth master curve is obtained for the stress relaxation process by setting the reference temperature T = 0.6 via the horizontal shifting process, indicating the validity of TTSP. Furthermore, similar smooth master curves are also achieved for both dynamic periodic shear and uniaxial tensile deformation, which exhibit similar trends and share the identical linear viscoelastic regime in the temperature interval above T: 0.55

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Modeling the large‐strain constitutive behavior of polycarbonate under isothermal and anisothermal conditions

Cited by 4 publications

References 26 publications

Viscoelastic Material Models of Polypropylene for Thermoforming Applications

Viscoelastic Material Models of Polypropylene for Thermoforming Applications

Process structuring of polymers by solid phase orientation processing

Strain rate and temperature dependence of the mechanical properties of polymers: A universal time-temperature superposition principle

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