Video-controlled tensile testing of polymers and metals beyond the necking point

G’Sell, C.; Hiver, Jean‐Marie; Dahoun, Abdesselam; Souahi, Abdelhamid

doi:10.1007/bf01105270

Cited by 275 publications

(166 citation statements)

References 18 publications

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“…The elastomer has a glass transition temperature T g of −48 °C estimated by DSC. Its density is 0.94 g/cm 3 and the number average molecular mass (M n ) of the starting polymer (before crosslinking) is 120 kg/mol. The mole fraction of styrene is 0.15.…”

Section: Methodsmentioning

confidence: 99%

“…Later, the measurement of strains has been improved by monitoring them in the longitudinal and transverse directions on one face of the sample. This may be achieved by video extensometry [3,4] or by digital image correlation [5]. Using such techniques coupled to the transverse isotropy assumption, authors reported substantial reversible volume changes [5] in disagreement with the earlier accurate dilatometry measurements [1,[6][7][8] evidencing negligible volume changes for unfilled rubbers and substantial volume changes for filled rubbers during the first load only.…”

Section: Introductionmentioning

confidence: 99%

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Volume changes in a filled elastomer studied via digital image correlation

et al. 2012

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractVolumetric strains in a filled SBR specimen subjected to cyclic uniaxial tension with increasing extensions are studied. Digital image correlation is used to follow the kinematics of two orthogonal free faces. A volume expansion is observed past a critical elongation, which can be interpreted as the onset of cavitation. Under unloading, the volume returns to its original value and remains constant upon reloading. Increasing the elongation to higher values than the previous cycle leads again to a volumetric expansion.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Volume changes in a filled elastomer studied via digital image correlation

et al. 2012

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“…The crystal structure results in (i) anisotropic elastic behavior where the elastic properties are given with respect to the crystallographic directions, and (ii) plastic deformation governed primarily by crystallographic slip on a limited number of slip planes [3,18]. Moreover, plastic deformation may result from mechanical twinning or stress-induced martensitic phase transformations [2,3,45,46].…”

Section: Crystalline Phasementioning

confidence: 99%

Semicrystalline Polymers

Michler¹

2015

Atlas of Polymer Structures

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Semicrystalline polymers often show a spherulitic morphology, consisting of a radial assembly of twisted crystalline lamellae and amorphous layers. A multiscale numerical model is used to investigate the mechanics of intraspherulitic deformation of polyethylene. The model establishes links across the microscopic, the mesoscopic, and the macroscopic levels. Constitutive properties of the material are identified for the crystallographic and amorphous domains. The averaged fields of an aggregate of individual phases, having preferential orientations, form the constitutive behavior of intraspherulitic material. The spherulitic macrostructure is described by finite element models. The macroscopic stress -strain response resembles that of a previous random polycrystalline model. However, the current model includes the geometrical effect of the anisotropic structure within a spherulite, causing strain concentrations in the centers, which spread out in the equatorial region for uniaxial loading conditions and in inclined directions for plane strain loading. The deformations are linked to microstructural processes as interlamellar deformation and intralamellar crystallographic slip. q

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“…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).…”

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confidence: 95%

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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Video-controlled tensile testing of polymers and metals beyond the necking point

Cited by 275 publications

References 18 publications

Volume changes in a filled elastomer studied via digital image correlation

Volume changes in a filled elastomer studied via digital image correlation

Semicrystalline Polymers

Multiscale modeling of thermoplastic PC/ABS blends

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