A portable digital speckle pattern interferometry device to measure residual stresses using the hole drilling technique

• Published in: Optics and lasers in engineering Vol. 44; no. 10; pp. 1052 - 1066
• Main Authors: Viotti, Matías R., Dolinko, Andrés E., Galizzi, Gustavo E., Kaufmann, Guillermo H.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-10-2006; Elsevier
• Subjects: Biological and medical applications; Digital speckle pattern interferometry; Efficiency, stability, gain, and other operational parameters; Exact sciences and technology; Fringe analysis; Fundamental areas of phenomenology (including applications); Hole drilling; Imaging and optical processing; Industrial applications; Laser optical systems: design and operation; Optics; Physics; Residual stresses; Speckle and moire patterns; Residual stresses; Fringe analysis; Digital speckle pattern interferometry; Hole drilling; Rigid bodies; Error analysis; Laser drilling; Optical bench; Data processing; Aluminium; Laser beam applications; Experimental study; Speckles; Image analysis; Electronic speckle pattern interferometry; Stress measurement
• ISSN: 0143-8166; 1873-0302
• DOI: 10.1016/j.optlaseng.2005.09.004

This paper presents a portable device to measure residual stresses using the hole drilling technique combined with digital speckle pattern interferometry. This device, which is based on only one dual-beam illumination system, allows the determination of the three components of the residual stress from the measured displacement field generated by the hole when specimens are placed outside of the optical bench. The description of the portable device and its principal characteristics is followed by the presentation of some preliminary experimental results obtained in thin aluminium plates subjected to a uniform uniaxial stress. An error analysis of the uncertainty sources introduced during the evaluation of the residual stresses, namely the error generated by the automatic data processing, the error produced by an incorrect location of the hole centre and the introduction of rigid body displacements, is also presented.