Constitutive model for thermoplastics with structural applications

Polanco-Loria, Mario A.; Clausen, Arild Holm; Berstad, T.; Hopperstad, Odd Sture

doi:10.1016/j.ijimpeng.2010.06.006

Cited by 55 publications

(31 citation statements)

References 24 publications

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“…To various degrees these models describe the key features of polymer materials, such as viscoelasticity, viscoplasticity, pressure-dependent yield stress, plastic dilatation (i.e. plastic Poisson's ratio <0.5) and damage [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of low-velocity impact loading of a ductile polymer material

Daiyan¹,

Grytten²,

Andreassen³

et al. 2012

Materials & Design

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of low-velocity impact loading of a ductile polymer material

Daiyan¹,

Grytten²,

Andreassen³

et al. 2012

Materials & Design

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“…Alternatively, a logarithmic potential as in ܹ ௩ has been widely applied in the literature [62][63][64][65]. The three different functions are compared in Figure 9 for a volume ratio ranging from 0.8 to 1.2.…”

Section: Volumetric Partmentioning

confidence: 99%

Volume growth during uniaxial tension of particle-filled elastomers at various temperatures – Experiments and modelling

Ilseng

Skallerud

Clausen

2017

Journal of the Mechanics and Physics of Solids

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“…Due to the unknown grade of ABS in the actual PC/ABS blends two extreme cases of ABS behavior from the literature are considered here [6], [7]. The constitutive model of Raghava [8] is used in both cases. Its yield condition Φ ≡ σ 2 e + ασ m − σ 2 y = 0 depends on the von Mises stress σ e and the hydrostatic stress σ m (Fig.…”

Section: Constitutive Modeling Of the Individual Phases And Parametermentioning

confidence: 99%

Multiscale modeling of thermoplastic PC/ABS blends

Hund

Seelig

2017

Proc Appl Math and Mech

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Rubber-toughened thermoplastic polymers such as PC/ABS blends exhibit a pronounced plastic dilatancy in their overall deformation behavior which results primarily from damage mechanisms in the ABS phase while PC behaves plastically incompressible, e.g. [1]. In this contribution, two commercial PC/ABS blends of different composition and morphology are approximated through appropriate unit cell models featuring the two constituents PC and ABS as distinct phases. Different visco-plasticity models are utilized to capture the specific deformation behavior of each phase. Numerical studies of the unit cell models looking at the effect of the blend composition on the overall response are compared with experimental data. 1 PC/ABS blends, blend morphologies and unit cell models PC/ABS blends are composed of the thermoplastic polymers polycarbonate (PC) and acrylonitrile butadiene styrene (ABS). These blends combine the strength of PC with the fracture toughness of the rubber-toughened ABS [1]. ABS is overall plastically dilatant due to the underlying micromechanisms rubber-particle cavitation, void growth and crazing. PC, in contrast, behaves plastically incompressible.Two commercial PC/ABS blends, Bayblend T45 and Bayblend T85, of covestro AG are considered in this work. Bayblend T45 features a PC/ABS ratio of 45/55 wt% while T85 has a 70/30 wt% PC/ABS ratio. The different compositions are reflected in the uniaxial stress-strain response as well as the dilation behavior. Bayblend T85 exhibits a higher overall stress response which can be attributed to its higher PC content (Fig. 1). A more pronounced dilation is found for Bayblend T45 caused by its higher ABS content (Fig. 2).Owing to differences in composition PC/ABS blends display different morphologies. In PC-rich blends (e.g. Bayblend T85) typically the ABS is dispersed as particles in the PC matrix whereas a co-continuous (interpenetrating) phase morphology is observed in blends with approximately equal PC and ABS content such as Bayblend T45 [2]. Assuming idealized periodic microstructures in the present work, the different morphologies are approximated by the unit cell models shown in Fig. 3. For the matrix-particle structure of the PC/ABS = 70/30 blend a body-centered cubic (BCC) arrangement was chosen (Fig. 3 a). The co-continuous morphology of the PC/ABS = 45/55 is approximated with an interpenetrating phase (IPP) structure (Fig. 3 b). 2 Constitutive modeling of the individual phases and parameter calibration For modeling of the individual PC and ABS phases two qualitatively different visco-plasticity models are utilized. The meanwhile standard model for neat glassy polymers by Boyce and coworkers [4] is chosen for the PC phase. Due to the purely deviatoric plastic part of the rate of deformation tensor this material model behaves plastically incompressible. The model's parameters were calibrated to experimental data fom [5] and the characteristic softening upon yield as well as the progressive hardening for large strains are well reproduced (Fig. 4).The behav...

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Constitutive model for thermoplastics with structural applications

Cited by 55 publications

References 24 publications

Numerical simulation of low-velocity impact loading of a ductile polymer material

Numerical simulation of low-velocity impact loading of a ductile polymer material

Volume growth during uniaxial tension of particle-filled elastomers at various temperatures – Experiments and modelling

Multiscale modeling of thermoplastic PC/ABS blends

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