Integrated digital image correlation for residual stress measurement

Antonio Baldi; Filippo Bertolino

doi:10.1117/12.2020758

13 May 2013 Integrated digital image correlation for residual stress measurement

Antonio Baldi, Filippo Bertolino

Proceedings Volume 8788, Optical Measurement Systems for Industrial Inspection VIII; 87881Y (2013) https://doi.org/10.1117/12.2020758
Event: SPIE Optical Metrology 2013, 2013, Munich, Germany

Abstract

Residual stress measuring by optical methods has been proposed by several authors in the past years; nevertheless the technique is still confined to optical laboratories: indeed the large sensitivity of the optical methods allows measuring very low stress values with high reliability, but these advantages are counter-balanced by the high sensitivity to vibrations, which makes very difficult performing the measurements outside of optical laboratories. Digital Image Correlation (DIC) is a possible alternative: indeed this technique is much less affected by vibrations, but its sensitivity is quite low, thus negatively affecting the accuracy of results. This work proposes a variant of Digital Image Correlation, known as iDIC (integrated DIC), to perform residual stress measurement. Since this approach directly integrates in the formulation the hole drilling shape functions, it overcome most of the problem of standard DIC; in this way it is possible to obtain accurate results without using interferometric techniques.

Citation Download Citation

Antonio Baldi and Filippo Bertolino "Integrated digital image correlation for residual stress measurement", Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87881Y (13 May 2013); https://doi.org/10.1117/12.2020758

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