Measurement of discontinuous displacement/strain using mesh-based digital image correlation

Yoneyama, Satoru; Koyanagi, Jun; Arikawa, Shuichi

doi:10.1080/09243046.2015.1052131

Cited by 21 publications

(4 citation statements)

References 18 publications

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“…The length of 1 mm corresponds to Various algorithms have been proposed for digital image correlation. In this study, a global digital image correlation algorithm (Yoneyama et al, 2016) employing a finite element mesh to search for displacements at all nodes simultaneously is used. Figure 2 shows the finite element model for global digital image correlation used in this study.…”

Section: Experimental Verification Of the Proposed Methods 31 Procedumentioning

confidence: 99%

Identification of plastic stress-strain parameters by global digital image correlation, the virtual fields method and the total strain theory

Hamada¹,

Jinno²,

Arikawa³

et al. 2016

Mechanical Engineering Journal

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A procedure for identifying plastic constitutive parameters from measured displacement fields based on virtual fields is proposed in this paper. The displacement fields of the specimen surface are obtained through measurements using global digital image correlation. Then, material property identification is implemented by utilizing piecewise virtual fields. In order to identify the material properties from the displacement fields obtained at an instant, the total strain theory is used as the constitutive equation. The relations between the material properties, measured displacement fields, measured tractions, and virtual displacements are obtained from the principle of virtual work, and they are solved numerically to obtain material properties. The effectiveness of the proposed method is demonstrated by applying it to displacement fields obtained by an elasto-plastic finite element method and experimentally obtained displacement fields of a pure aluminum specimen. The results of the numerical validation show that the elasto-plastic material properties can be identified from a single set of displacement fields under proportional loading. Meanwhile, the results of the experimental validation show that the elasto-plastic material properties can be evaluated but the discrepancy between the inversely identified stress-strain curve and the directly measured one is observed.

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Section: Experimental Verification Of the Proposed Methods 31 Procedumentioning

confidence: 99%

Identification of plastic stress-strain parameters by global digital image correlation, the virtual fields method and the total strain theory

Hamada¹,

Jinno²,

Arikawa³

et al. 2016

Mechanical Engineering Journal

Self Cite

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“…Ncorr software (LabVIEW, National Instruments, Austin, TX, USA) was used to detect the changes in the location of the dots during the DIC analysis. The strain along the X-direction (Ɛxx), shear strain (Ɛxy), and strain along the Y-direction (Ɛyy), was calculated according to previous studies (Pan et al 2009;Canal et al 2012;Caminero et al 2013;Harilal et al 2015;Yoneyama et al 2016;Guoqing Gu et al 2017;Barile et al 2019).…”

Section: Digital Image Correlation (Dic)mentioning

confidence: 99%

Mechanical characterization and strain analysis applied to the heat treatment of wood materials, by means of digital image correlation

Aydemir,

Aksu,

Bardak

et al. 2024

BioRes

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Digital image correlation (DIC) was used to examine the strain distribution of heat-treated beech and Uludag fir woods in mechanical testing. It also evaluated the effects of the heat treatment process on the properties of the wood samples. The physical (mass/density loss, dimensional stability, color change, and surface roughness), mechanical (flexure test and compressive strength), morphological, thermal, and structural properties of the heat-treated wood were examined. It was determined that the heat treatment parameters can be optimized using the DIC method. The test results showed that although heat treatment can provide improved physical and thermal properties, it caused micro-crack formations and collapses in the wood cells. As a consequence, the mechanical properties of the heat-treated wood materials decreased with the heat treatment process. There were slight differences in the curves of the samples according to Fourier infrared and X-ray diffraction analyses. Morphological characterization showed that the heat treatment triggered large cracks in the cell wall and lumens and the morphological structure of heat-treated wood was affected at large percentages.

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“…One way to understand the damage behavior around the fiber discontinuity area is to experimentally measure the strain around the resin pocket caused by fiber discontinuity. Many studies have employed the DIC and ESPI methods to measure the strain distributions in composite laminates [24][25][26][27][28][29]. Compared to DIC and ESPI, moiré and GPA methods are grid-based techniques possessing strong resistance to noise despite the need for grids.…”

Section: Introductionmentioning

confidence: 99%

Measurement of microscopic strain distributions of CFRP laminates with fiber discontinuities by sampling moiré method

Fikry

Wang

Irita

et al. 2021

Advanced Composite Materials

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Measurement of microscopic strain distributions of CFRP laminates with fiber discontinuities by sampling moiré methodCarbon fiber-reinforced plastics (CFRP) laminate structures manufactured using prepregs usually contain fiber discontinuities that result from the prepreg cutting for design and cost-efficiency. In this study, the sampling moiré method was used to measure the microscopic strain of unidirectional CFRP laminates with fiber discontinuities to investigate the deformation behavior that causes damage. In addition to the strain distributions of the laminate before and after cracking, the strain results due to thermal residual stress relaxation and residual plastic deformation during cracking were also obtained. The experimental results of this study were in good agreement with the FEM results. Our results revealed that the sampling moiré method is an accurate method of measuring microscopic strain that can be used to evaluate the mechanical properties, damage behavior, residual strains in laminate with fiber discontinuities, and other different materials and structures.

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Measurement of discontinuous displacement/strain using mesh-based digital image correlation

Cited by 21 publications

References 18 publications

Identification of plastic stress-strain parameters by global digital image correlation, the virtual fields method and the total strain theory

Identification of plastic stress-strain parameters by global digital image correlation, the virtual fields method and the total strain theory

Mechanical characterization and strain analysis applied to the heat treatment of wood materials, by means of digital image correlation

Measurement of microscopic strain distributions of CFRP laminates with fiber discontinuities by sampling moiré method

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