A Review of the Challenges and Limitations of Full‐Field Measurements Applied to Large Heterogeneous Deformations of Rubbers

Cam, Jean‐Benoît Le

doi:10.1111/j.1475-1305.2011.00830.x

Cited by 24 publications

(10 citation statements)

References 107 publications

(142 reference statements)

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“…There are traditionally a few measures that can help perform automated initial guess for the large rotation and deformation cases in the DIC analysis [], which include but not limited to capturing many intermediate images during measurement, making easy detectable special markers, applying prior knowledge of the experiment to the analysis and so on. Unlike these schemes, the proposed approach provides an alternative and generic way to cope with the automated DIC initial guess issue.…”

Section: Discussionmentioning

confidence: 99%

Automated Fast Initial Guess in Digital Image Correlation

Wang

Kieu

et al. 2013

Strain

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A challenging task that has hampered the fully automatic processing of the digital image correlation (DIC) technique is the initial guess when large deformation and rotation are present. In this paper, a robust scheme combining the concepts of a scale‐invariant feature transform (SIFT) algorithm and an improved random sample consensus (iRANSAC) algorithm is employed to conduct an automated fast initial guess for the DIC technique. The scale‐invariant feature transform algorithm can detect a certain number of matching points from two images even though the corresponding deformation and rotation are large or the images have periodic and identical patterns. After removing the wrong matches with the improved random sample consensus algorithm, the three pairs of closest and non‐collinear matching points serve for the purpose of initial guess calculation. The validity of the technique is demonstrated by both computer simulation and real experiment.

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Section: Discussionmentioning

confidence: 99%

Automated Fast Initial Guess in Digital Image Correlation

Wang

Kieu

et al. 2013

Strain

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“…Further information on infrared thermography in case of large deformations is provided in [10]. The infrared camera was a FLIR infrared camera (see Figure 2) equipped with a focal plane array of 640×512 pixels and detectors operating in wavelengths between 1.…”

Section: Temperature Measurementsmentioning

confidence: 99%

Stored energy accompanying cyclic deformation of filled rubber

Loukil

Corvec

Robin

et al. 2018

European Polymer Journal

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International audienceThe hysteresis observed in the mechanical response of filled rubbers is classically assumed to be due to viscosity. In this study, a complete energy balance is carried out during cyclic deformation of a filled acrylonitrile-butadiene rubber. Results show that for the studied material, viscosity is not the preponderant contribution to the hysteresis loop: the mechanical energy brought to the material is not entirely dissipated into heat but a contrario is mainly used by the material to change its microstructure. Moreover, no significant hysteresis loop is observed in the unfilled material. Hence, the filler network stores elastic energy during its deformation, leading to a change in the internal energy. The higher the stretch applied, the higher the relative stored energy, but the higher the stretch rate applied, the lower the relative stored energy in the filler network. This has been evidenced by defining a ratio γse in terms of energy. As hysteresis loop in rubbers does not systematically mean that intrinsic dissipation is produced, predicting changes in temperature, and consequently the self-heating, is not possible from the mechanical response only. To conclude, this study presents the first estimation of stored energy in a filled rubber. © 2017 Elsevier Lt

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“…For this purpose, the3D formulation of the heat diffusion is simplified using some assumptions that are briefly outlined here. The reader can refer to [3,11] for further information.…”

Section: Calculation Of Heat Sourcesmentioning

confidence: 99%

“…Some of these techniques enable their users to measure displacement and strain fields that occur in specimens subjected to a given test. Concerning elastomers, digital image correlation is probably the most suitable technique thanks to its ability to track points of the surface of specimens undergoing large deformations [1][2][3]. Another technique, termed infrared thermography, provides another field: the temperature variation field measured at the surface of specimens subjected to mechanical loads.…”

Section: Introductionmentioning

confidence: 99%

Combining displacement, strain, temperature and heat source fields to investigate the thermomechanical response of an elastomeric specimen subjected to large deformations

et al. 2012

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International audienceCombining thermal and kinematic full-field measurements at the same time is gaining widespread acceptance in the community involved in the thermomechanical characterization of materials. However, obtaining such attractive information in the case of elastomers for which large deformations occur raises specific experimental issues which are addressed in this paper. The problem arises in mapping both the thermal and the kinematic quantities in the same reference coordinate system in order to write properly the heat diffusion equation. This equation provides heat sources which constitute a relevant quantity in the framework of thermomechanics. The procedure is presented and the underlying practical difficulties are detailed. It is then applied in the case of a specific test performed on a so-called three-branch specimen. Finally, the obtained strain and heat source distributions are briefly discussed

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A Review of the Challenges and Limitations of Full‐Field Measurements Applied to Large Heterogeneous Deformations of Rubbers

Cited by 24 publications

References 107 publications

Automated Fast Initial Guess in Digital Image Correlation

Automated Fast Initial Guess in Digital Image Correlation

Stored energy accompanying cyclic deformation of filled rubber

Combining displacement, strain, temperature and heat source fields to investigate the thermomechanical response of an elastomeric specimen subjected to large deformations

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