Residual stress evaluation using shearography with large shear displacements

Richard B. Hathaway; Joseph Der Hovanesian; Y.Y. Hung

doi:10.1117/12.57465

1 December 1991 Residual stress evaluation using shearography with large shear displacements

Richard B. Hathaway, Joseph Der Hovanesian, Y.Y. Hung

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.57465
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A newly developed optical method for the qualitative and quantitative evaluation of residual and live-load stresses is presented. The method utilizes shearography employing a large angle shearing prism which results in large shear displacements. The large angle shearing prism allows the surface speckle pattern to be referenced and mapped onto a remote, separately positionable, surface. Changes on the object surface are initiated between exposures by means of a spherical impression made into the surface. The impression is made by impacting a hardened ball into the surface producing local stresses approximately three times the magnitude of the yield stress for the material. The deformation pattern is recorded and related to the stress that was initially present in the specimen.

Citation Download Citation

Richard B. Hathaway, Joseph Der Hovanesian, and Y.Y. Hung "Residual stress evaluation using shearography with large shear displacements", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.57465

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