High strain gradient measurements by using digital image correlation technique

Lagattu, Fabienne; Brillaud, J.; Lafarie-Frenot, M.C.

doi:10.1016/j.matchar.2004.07.009

Cited by 85 publications

(54 citation statements)

References 21 publications

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“…This technique has been used in various technological domains and many of its applications have been reported [1][2][3][4][5][6]. The capacity of the technique to measure non-homogeneous deformation fields has been described [7] as well as its limits and the accuracy of the measured displacements [8,9].…”

Section: Introductionmentioning

confidence: 99%

Quality assessment of speckle patterns for digital image correlation

Lecompte

Smits

Bossuyt

et al. 2006

Optics and Lasers in Engineering

446

231

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Digital image correlation (DIC) is an optical-numerical full-field displacement measuring technique, which is nowadays widely used in the domain of experimental mechanics. The technique is based on a comparison between pictures taken during loading of an object. For an optimal use of the method, the object of interest has to be covered with painted speckles. In the present paper, a comparison is made between three different speckle patterns originated by the same reference speckle pattern. A method is presented for the determination of the speckle size distribution of the speckle patterns, using image morphology. The images of the speckle patterns are numerically deformed based on a finite element simulation. Subsequently, the displacements are measured with DIC-software and compared to the imposed ones. It is shown that the size of the speckles combined with the size of the used pixel subset clearly influences the accuracy of the measured displacements.

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Section: Introductionmentioning

confidence: 99%

Quality assessment of speckle patterns for digital image correlation

Lecompte

Smits

Bossuyt

et al. 2006

Optics and Lasers in Engineering

446

231

View full text Add to dashboard Cite

show abstract

“…Virtually all theoretically stressed orthotropic members are restricted to infinitely large geometry. Moreover, unlike the present approach, prior DIC analyses of circularly-perforated orthotropic composites necessitated measuring both in-plane displacements and did not provide reliable information at the edge of the hole [4,5].…”

Section: Summary Discussion and Conclusionmentioning

confidence: 93%

“…Lagattu et al [4] and Ashrafi and Tuttle [5] are seemingly the only prior publications which employ DIC-measured displacement information to stress analyze orthotropic composites containing a round hole. These analyses necessitated measured values of both in-plane displacement components and experienced difficulties in obtaining reliable result on the edge of the hole.…”

Section: Literature Reviewmentioning

confidence: 99%

Stress Analysis of a Circularly-Perforated Finite Orthotropic Composite Plate

Fatima¹,

Rowlands²

2017

JMEA

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Stresses, particularly those at geometric discontinuities, can influence structural integrity of engineering components. Motivated by the prevalence of cutouts in components, the objective of this paper is to demonstrate ability to stress analyze finite, circularly-perforated orthotropic composites whose external loading may be unknown. Recognizing difficulties in obtaining purely theoretical or numerical solutions, the paper presents a hybrid means of stress analyzing such structures. Individual stresses, including those on the edge of the hole, are obtained in a loaded finite graphite/epoxy composite tensile plate containing a round hole by processing measured values of a single displacement field with an Airy stress function in complex variables. Displacements are recorded by digital image correlation. Traction-free conditions are satisfied analytically at the edge of the hole using conformal mapping and analytic continuation. Stresses satisfy equilibrium and strains satisfy compatibility. Significant features of the technique include its wide applicability, it smooths the measured information, does not require knowing the applied loading, and the rigorous mechanics foundation by which strains are determined from measured displacements.

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“…However, there are certain drawbacks that make the method useless for some applications, such as experiments producing high strain gradients [12]. The reason is non-continuity of the displacement field, as the displacements of the subsets are sought separately.…”

Section: Dic Algorithmsmentioning

confidence: 99%

Assessment of 2d-Dic Stochastic Patterns

Antoš

Nežerka

Somr

2017

APP

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Abstract. Cost of experimental testing of materials and structures subjected to mechanical loading often constitutes a significant portion of a project budget. Therefore a collection of data in a maximum possible amount is desirable. Extensometers and strain-gauges attached to the specimen surface often fail and cannot provide full-field information about the development of displacements and strains. Digital Image Correlation (DIC) is capable of providing such information. Unsuitable texture or artificially applied pattern, essential for DIC analysis, can spoil the DIC outcomes completely. An additional investment into preparation of new experimental testing can be avoided with the use of tools employing algorithms for stochastic pattern assessment. The development of such algorithms and their implementation into an open-source DIC software is the goal of the presented research.

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High strain gradient measurements by using digital image correlation technique

Cited by 85 publications

References 21 publications

Quality assessment of speckle patterns for digital image correlation

Quality assessment of speckle patterns for digital image correlation

Stress Analysis of a Circularly-Perforated Finite Orthotropic Composite Plate

Assessment of 2d-Dic Stochastic Patterns

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