Strain Analysis by Digital Shearography on an Aluminium Plate with a Geometric Defect under Thermal Loading

Document Type : Original Research Paper

Authors

Mechanical Engineering Department, University of Zanjan, Iran.

Abstract

Digital shearography is a non-destructive and non-contact method for strainmeasurement. In this article strain analysis on defected plate has been studied by the digital shearography method along with a new technique for phase map measurement. For this purpose, an optical set-up known as modified Michelson interferometry system with two diode lasers were developed which are used as coherent optical source. To create phase shifting a piezo-electrical ceramic was used to miniature displacements of interferometry. Phase shifting technique was used to measure phases and differences between the phases.
The strain was measured using the experimental method and compared with numerical analysis results. Behavior of two graphs of experimental measurement and numerical analysis was approximately the same.

Keywords

References

[1] B. Bhaduri, M.P. Kothiyal, N. Krishna Mohan, Digital speckle pattern interferometry (DSPI) with increased sensitivity: Use of spatial phase shifting, Opt. Commun. 272 (2007) 9-14.
[2] B. Bhaduri, N. Krishna Mohan, M.P. Kothiyal, Use of spatial phase shifting technique in digital speckle
pattern interferometry (DSPI) and digital shearography (DS), Opt. Express. 14(24) (2006) 11598-11607.
[3] P.K. Rastogi, Digital Speckle Pattern Interferometry and Related Techniques, John Wiley and Sons Ltd., New York, 2001.
[4] S. Wu, L. Zhu, Q. Feng, L. Yang, Digital shearography with in situ phase shift calibration, Opt. Laser.
Eng. 50 (2012) 1260-1266.
[5] Ch. Cai, L. He, Improved Mach-Zehnder interferometer-based shearography, Opt. Laser. Eng. 50 (2012) 1699-1705 .
[6] A. Albertazzi, M. Viotti, M. Kapp, A radial Inplane DSPI interferometer using diffractive optics for residual stress measurement. In: Ninth International Symposium on Laser Metrology, 2008 Bellingham, (715525-1-715525-10).
[7] W. Steinchen, L. Yang, Digital Shearography: Theory and Application of Digital Speckle Pattern Shearing Interferometer, SPIE Press, Washington, (2003).
[8] D.V. Nelson, Residual stress determination by hole drilling combined with cptical methods, Measurement, SEM, (2010).

Journal of Stress Analysis
Volume 1, Issue 1
September 2016
Pages 1-7

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