1 December 2020 Water-soluble stabilizer for speckle pattern fabrication
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Abstract

This work aims to provide a quick solution for impressing a well-defined and repeatable speckle pattern on the surface of a material sample. The proposed technique is based on a water-soluble stabilizer on which the speckle pattern generated and optimized via computer is printed. To verify the application, a two-dimensional (2D) digital image correlation (DIC) system is employed to measure the full-range strain distribution at the macroscopic level during a tensile test on open-hole aluminum specimen. The experimental setup consists mainly of an action camera, a macro lens, and an open-source 2D DIC software. The measured data obtained from the DIC are compared to the other ones provided both from a traditional measurement method based on strain gauge and by a numerical simulation. The results indicate that the approach is both accurate and reliable to obtain stress-strain curves especially in the presence of plastic deformations.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Leandro Maio "Water-soluble stabilizer for speckle pattern fabrication," Optical Engineering 59(12), 124101 (1 December 2020). https://doi.org/10.1117/1.OE.59.12.124101
Received: 14 July 2020; Accepted: 4 November 2020; Published: 1 December 2020
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KEYWORDS
Speckle pattern

Digital image correlation

Optical engineering

Cameras

Image information entropy

Speckle

Aluminum

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