Low-cost speckle interferometry for measuring 3D deformation fields: Hardware and software

Bova, Marco; Bruno, Luigi; Poggialini, Andrea

doi:10.1016/j.optlaseng.2009.07.018

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…To measure the strain in the deforming specimen during experiments, especially when the direct measurement is not possible (i.e., in case of localized deformation), various techniques such as photoelasticity, Moiré method, holographic method, speckle interferometry, and digital image correlation (DIC) are used. [ 15–20 ] Among these techniques, DIC is the most promising and is widely used to measure the strains in the necked region of the specimen under investigation. [ 20–29 ] The DIC technique utilizes a coated object with retro‐reflective paint in conjunction with an artificial speckle pattern printed for strain measurement.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Notch Effect Based on Finite Element Analysis and Digital Image Correlation Technique

Kumar

Chaitanya

Goyal

et al. 2020

steel research int.

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Triaxial state of stress experienced by structural components due to complex geometry, discontinuities, or type of loading can be studied by tensile testing of notched specimens. Herein, assessment of tensile deformation of 316LN austenitic stainless under the uniaxial and triaxial stresses is presented based on finite element (FE) analysis and digital image correlation (DIC). To study their effects, notches of different root radii are incorporated in flat smooth specimens. The strength of the material increases in the presence of notch. Among the various constitutive expressions, the Swift equation provides a better representation of the tensile response for the smooth specimen. The analysis is further extended by incorporating Swift equation parameters as the deformation model in the FE analysis for notched specimens. The tensile response of the notched specimens is predicted well using the FE analysis. The in‐house algorithm is developed for DIC and used to estimate the strain in smooth and notched specimens by speckle‐pattern image analysis. The total displacement of smooth and notched specimens obtained from the FE analysis and DIC technique is comparable to the experimental results. Both the techniques complemented each other in understanding the deformation behavior of the steel.

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Section: Introductionmentioning

confidence: 99%

Assessment of Notch Effect Based on Finite Element Analysis and Digital Image Correlation Technique

Kumar

Chaitanya

Goyal

et al. 2020

steel research int.

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Advances in Speckle Metrology

Joenathan

Sirohi

Bernal

2015

The Optics Encyclopedia

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The field of speckle metrology has seen a surge in development in the past 10 years owing to advancements in digital cameras and computing power. For instance, a variety of digital speckle correlation (DSC) processes can now be performed in almost real time and therefore speckle techniques has found applications in nondestructive testing (NDT), biology, and medicine. New techniques in terms of optical arrangements and in extracting phase data have been introduced for measuring out‐of‐plane and in‐plane motions in digital speckle interferometry (DSPI) and digital speckle shear interferometry (DSSPI). DSC, DSPI, and DSSPI have also been combined to extend the range of measurements. In addition, quantitative analysis in speckle interferometry has seen a plethora of new software developments for conducting real‐time, accurate, complicated, fast, and repeatable measurements with ease. In addition, different methods to process speckle fringes have made analysis equivalent to that of classical interferometry, yet can be applied to all types of real‐world specimen.

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A multi-camera speckle interferometer for dynamic full-field 3D displacement measurement: Validation and inflation testing of a human eye sclera

Bruno

Bianco

Fazio

2018

Optics and Lasers in Engineering

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Low-cost speckle interferometry for measuring 3D deformation fields: Hardware and software

Cited by 4 publications

References 24 publications

Assessment of Notch Effect Based on Finite Element Analysis and Digital Image Correlation Technique

Assessment of Notch Effect Based on Finite Element Analysis and Digital Image Correlation Technique

Advances in Speckle Metrology

A multi-camera speckle interferometer for dynamic full-field 3D displacement measurement: Validation and inflation testing of a human eye sclera

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