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Measurement of Strain Gradients Using Digital Image Correlation by Applying Printed-Speckle Patterns

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Abstract

Digital image correlation (DIC) measurements were obtained using speckle patterns produced using two different methods. In the first case, speckles were produced on the surface of a test specimen using white and black spray paint, which is probably the most common approach. In the second case, a computer code was written that creates a random-speckle pattern digitally. The digital-speckle pattern was then printed on white paper using a standard laser printer. The speckled paper was subsequently bonded to the surface of a test specimen using a commercial strain gage adhesive. Strains were measured using both types of speckle patterns for a thin plate with hole and for a U-shaped beam loaded in tension. Strain fields measured using the painted and digital-speckle patterns are essentially identical and are well predicted by the corresponding elasticity solutions.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA

    Mahdi Ashrafi & Mark E. Tuttle

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  1. Mahdi Ashrafi
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  2. Mark E. Tuttle
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Correspondence to Mahdi Ashrafi.

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Ashrafi, M., Tuttle, M.E. Measurement of Strain Gradients Using Digital Image Correlation by Applying Printed-Speckle Patterns. Exp Tech 40, 891–897 (2016). https://doi.org/10.1007/s40799-016-0090-0

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  • DOI: https://doi.org/10.1007/s40799-016-0090-0

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