Mixed-mode cohesive zone parameters from integrated digital image correlation on micrographs only

Ruybalid, AP Andre; Hoefnagels, Jpm Johan; Sluis, O. van der; Maris, M.P.F.H.L. van; Geers, M.G.D.

doi:10.1016/j.ijsolstr.2018.08.010

Cited by 14 publications

(8 citation statements)

References 30 publications

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“…The importance of using load data to identify a mixed-mode CZM for a composite was highlighted in another study [32]. Conversely, mixed-mode CZMs were calibrated without the need for force data, only using the images of the experiment on a microelectronic device [33].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a castable refractory using the wedge splitting test and cohesive zone model

Vargas

Neggers

Canto

et al. 2019

Journal of the European Ceramic Society

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A cohesive zone approach is applied to the Wedge Splitting Test (WST) using the finite element code Abaqus to obtain the tensile strength, the fracture energy and insight about the crack wake region. A Finite Element Model Updating (FEMU) method, with a cost function based on the measured load (FEMU-F), is used to calibrate the sought parameters. Digital Image Correlation (DIC) provided the kinematic boundary conditions, and the images were also used to define the geometry for the finite element analysis. Besides the fracture energy analysis and the experimental load, gray level images and displacement fields are analyzed in order to validate the results. The cohesive region is active in the whole analyzed test as confirmed by estimates using the cohesive length.

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Section: Introductionmentioning

confidence: 99%

Analysis of a castable refractory using the wedge splitting test and cohesive zone model

Vargas

Neggers

Canto

et al. 2019

Journal of the European Ceramic Society

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“…Specifically note-worthy is the fine tuning done in [26][27][28], where time-Integrated Digital Image Correlation algorithms are proposed exploiting the periodicity of the deformation to simultaneously correlate all images at once to stabilize the correlation and identify material parameters with high sensitivity, by further increasing the ratio of measurement points to DOFs. Where in [27] this algorithm was only validated on synthetically generated images, the strength of this method was later demonstrated on experimental images, for instance for the challenging test case of identifying insensitive mixed-mode interface adhesion properties [29,30]. In [28], this concept was again proven to be valuable for vibrational analysis, while in an earlier more specific paper a time-integrated algorithm tuned to periodic motion has been validated for fatigue testing [26].…”

Section: Introductionmentioning

confidence: 99%

Accurate Strain Field Measurement During Strip Rolling by Exploiting Recurring Material Motion with Time-Integrated Digital Image Correlation

et al. 2021

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Background 95% Of all metals and alloys are processed using strip rolling, explaining the great number of existing strip rolling optimization models. Yet, an accurate in-situ full-field experimental measurement method of the deformation, velocity and strain fields of the strip in the deformation zone is lacking. Objective Here, a novel time-Integrated Digital Image Correlation (t-IDIC) framework is proposed and validated that fully exploits the notion of continuous, recurring material motion during strip rolling. Methods High strain accuracy and robustness against unavoidable light reflections and missing speckles is achieved by simultaneously correlating many (e.g. 200) image pairs in a single optimization step, i.e. each image pair is correlated with the same average global displacement field but is multiplied by a unique velocity corrector to account for differences in material velocity between image pairs. Results Demonstration on two different strip rolling experiments revealed previously inaccessible subtle changes in the deformation and strain fields due to minor variations in pre-deformation, elastic recovery, and geometrical irregularities. The influence of the work roll force and entry/exit strip tension has been investigated for strip rolling with an industrial pilot mill, which revealed unexpected non-horizontal material feed. This asymmetry was reduced by increasing the entry strip tension and rolling force, resulting in a more symmetric strain distribution, while increased distance between the neutral and entry point was found for a larger rolling force. Conclusions The proposed t-IDIC method allows for robust and accurate characterization of the strip’s full-field behavior of the deformation zone during rolling, revealing novel insights in the material behavior.

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“…This type of analysis will also be used herein to guide the calibration procedure. Last, in a very recent paper, Ruybalid et al [43] calibrated a mixed-mode CZM using only micrographs, without coupling force data. In the present analysis, the load data will be the primary information used for calibrating the sought parameters.…”

Section: Introductionmentioning

confidence: 99%

On the identification of cohesive zone model for curved crack in mortar

Vargas

Tsitova

Bernachy‐Barbe

et al. 2020

Strain

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This paper proposes an approach to defining the path of a curved crack in a single edge notched specimen with gray level residuals extracted from digital image correlation, followed by the calibration of the parameters of a cohesive zone model. Only the experimental force is used in the cost function minimized via finite element model updating. The displacement and gray level residual fields allow for the validation of the calibrated parameters. Last, the results are confronted with those given by a straight crack to highlight the benefits of accounting for the actual crack path.

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Mixed-mode cohesive zone parameters from integrated digital image correlation on micrographs only

Cited by 14 publications

References 30 publications

Analysis of a castable refractory using the wedge splitting test and cohesive zone model

Analysis of a castable refractory using the wedge splitting test and cohesive zone model

Accurate Strain Field Measurement During Strip Rolling by Exploiting Recurring Material Motion with Time-Integrated Digital Image Correlation

On the identification of cohesive zone model for curved crack in mortar

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