Use of digital image correlation to measure large-strain tensile properties of ductile thermoplastics

Grytten, Frode; Daiyan, H.; Polanco-Loria, Mario A.; Dumoulin, Stéphane

doi:10.1016/j.polymertesting.2009.05.009

Cited by 105 publications

(54 citation statements)

References 12 publications

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“…[20], in order to obtain true stress (Cauchy stress) as function of true strain (logarithmic strain), both as average values over the cross-section, see Fig. 2a.…”

Section: Uniaxial Tensionmentioning

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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“…[20], in order to obtain true stress (Cauchy stress) as function of true strain (logarithmic strain), both as average values over the cross-section, see Fig. 2a.…”

Section: Uniaxial Tensionmentioning

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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“…Using 3D-DIC, Dick and Korkolis (2014) detected the onset of necking and measured the shape of the strain profile in the neck for an aluminium alloy specimen subjected to the ring hoop tension test. Grytten et al (2009) studied the large-strain deformation of ductile thermoplastics using 3D stereo DIC and made particularly interesting findings on volumic deformation and Poisson's ratio measurements and the effect of anisotropy on the transverse plane, perpendicular to the plastic flow. In Besnard et al (2012), the authors studied the kinematic of strain localization in the case of very high strain rates (tensile tests with Hopkinson bars).…”

Section: Introductionmentioning

confidence: 99%

Kinematic study of necking in a semi-crystalline polymer through 3D Digital Image Correlation

Silva

Farge

2015

International Journal of Solids and Structures

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a b s t r a c tThis study is devoted to the necking phenomenon and to the kinematic aspects associated with this plastic instability. The material studied is a High Density PolyEthylene deformed in tension. Full-field 3D-DIC (Digital Image Correlation) strain measurements were carried out on one face of a tensile specimen. On the opposite face, the longitudinal strain was measured in the central section using video-traction Ò , an extensometer based on marker tracking. This last measurement was used with feedback to control the strain rate in the specimen center. Specific data processing was run on the 3D-DIC measurements to obtain strain and strain rate maps up to true strain levels greater than 1.8. Even with measurements made on a relatively small strain rate range (smaller than 1 decade), we highlighted how much the necking phenomenon depends on the strain rate. In particular, we found that, around the yield point, the strain localization is more pronounced with higher strain rates. By analyzing the evolution of the strain rates in the necking shoulder regions, we carried out direct and original measurements of the strain level corresponding to the onset of necking stabilization (Natural Draw Ratio). This was possible because our original experimental protocol enabled us to obtain such strain maps even when the true strain values were significantly greater than 1. From an experimental point of view, we found that a video-extensometer based on marker tracking cannot efficiently measure the strain rate in the specimen center at large strain levels when the markers are greatly very deformed. In addition, a wide range of new experimental results (2D and 1D strain-rate and velocity data) is presented in this paper and we consider that this data should be particularly useful for the validation of numerical simulations of necking in polymers.

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“…Recourse to DIC has already been reported in the past to study elastomers subjected to large strains as discussed below [12,5]. The observation of two free faces with a single camera and an optical prism [13] or two cameras (both viewing the two studied faces and combined with stereo correlation) [14] has been reported. However, side view, optical distortions combined with inhomogeneous strains as encountered in necking leads to limited accuracy in the strain evaluation.…”

Section: Introductionmentioning

confidence: 99%

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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Use of digital image correlation to measure large-strain tensile properties of ductile thermoplastics

Cited by 105 publications

References 12 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

Kinematic study of necking in a semi-crystalline polymer through 3D Digital Image Correlation

Volume changes in a filled elastomer studied via digital image correlation

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