Residual stress measurement using a radial in-plane speckle interferometer and laser annealing: preliminary results

• Published in: Optics and lasers in engineering Vol. 42; no. 1; pp. 71 - 84
• Main Authors: Viotti, Matı́as R., Sutério, Ricardo, Albertazzi, Armando, Kaufmann, Guillermo H.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-07-2004; Elsevier
• Subjects: Digital speckle pattern interferometry; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Imaging and optical processing; Instruments for strain, force and torque; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Laser annealing; Mechanical instruments, equipment and techniques; Nondestructive evaluation; Optics; Physics; Radial interferometer; Residual stresses; Speckle and moire patterns; Nondestructive evaluation; Laser annealing; Residual stresses; Radial interferometer; Digital speckle pattern interferometry; Stress distribution; Measurement systems; Laser-radiation heating; Displacement measurement; Displacement field; Ductile material; Experimental study; Speckle interferometry; Thermal annealing; Interferometers; Stress measurement
• ISSN: 0143-8166; 1873-0302
• DOI: 10.1016/S0143-8166(03)00069-1

This paper presents a combined system based on digital speckle pattern interferometry and laser annealing to determine residual stresses in ductile materials. The system allows the measurement of the radial in-plane displacement field generated when a specimen subjected to residual stresses is locally heated. This novel approach for measuring residual stresses has the advantage of being nondestructive and can be easily applied to in situ tests. The description of the combined system is followed by the presentation of preliminary results which illustrate the ability of both techniques to quantify residual stress fields and also to determine their principal directions.