Asian Journal of Physics

Vol 31, No 8 (2022) 847-862

Hole-drilling method combined with DSPI: challenges and achievements for residual stress measurements

Matias Roberto Viotti, Filipe Zanini Broetto and Armando Albertazzi (Jr)
Laboratório de Metrologia e Automatização (Labmetro),
Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.

This article is dedicated to Professor Cesar Sciammarella

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The hole drilling technique is extensively applied to measure residual stresses in mechanical components and can be applied both in laboratory and industrial environments. Usually, the hole drilling method is combined with electrical strain gages. Many research group activities have been oriented to replace the measurement with strain gages by optical techniques. These techniques are appropriate for rapid measurements considering they are non-contacting methods, and they are suitable to perform full-field evaluation. One limitation for the hole drilling technique is its depth sensitivity. Typically, the method can only identify stresses up to a depth of approximately the radius of the hole. Consequently, for a conventional hole diameter of 1.6 mm, the hole depth will be between 0.8 mm and 1 mm. This paper shows the achievements of Labmetro during the last decade regarding the application of radial in-plane speckle interferometer to the measurement of residual stresses in real situations involving the oil and gas industry. Additionally, the paper also shows the advancements that have made possible to achieve higher depths. The examples presented in the paper clearly show the suitability of the speckle metrology as a supplementary tool for the assessment of the integrity in structures. © Anita Publications. All rights reserved.
Keywords: Hole-drilling, Speckle interferometry, Radial sensitivity, Residual stresses.

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Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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