Residual stress measurements with laser speckle                        correlation interferometry and local heat treating

Martin J. Pechersky; Robert F. Miller; Chandra S. Vikram

doi:10.1117/12.210762

1 October 1995 Residual stress measurements with laser speckle correlation interferometry and local heat treating

Martin J. Pechersky, Robert F. Miller, Chandra S. Vikram

Author Affiliations +

Optical Engineering, Vol. 34, Issue 10, (October 1995). https://doi.org/10.1117/12.210762

Abstract

A new experimental technique has been devised to measure residual stresses in ductile materials with a combination of laser speckle pattern interferometry and spot heating. The speckle pattern interferometer measures in-plane deformations while the heating provides for very localized stress relief. The residual stresses are determined by the amount of strain that is measured subsequent to the heating and cool-down of the region being interrogated. A simple lumped-parameter model is presented to provide a description of the method. This description is followed by presentation of the results of finite-element analyses and experimental results with uniaxial test specimens. Excellent agreement between the experiments and the computer analyses was obtained.

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Martin J. Pechersky, Robert F. Miller, and Chandra S. Vikram "Residual stress measurements with laser speckle correlation interferometry and local heat treating," Optical Engineering 34(10), (1 October 1995). https://doi.org/10.1117/12.210762

Published: 1 October 1995

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