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Residual Stress Determination Using Cross-Slitting and Dual-Axis ESPI

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Abstract

Hole-drilling and Electronic Speckle Pattern Interferometry (ESPI) are used to measure residual stresses in metal specimens. The slitting method is chosen as an alternative to the more commonly used hole-drilling method because it involves less material removal and leaves large areas of highly deformed material available to be measured. However the conventional single-slitting method is sensitive only to the stress component perpendicular to the slit direction, and thus has a strong directional bias. Conventional ESPI has a similar bias because it responds to surface displacements in a specific sensitivity direction. In this paper, a novel cross-slitting method with dual-axis ESPI measurements is proposed to address both directional biases. Cross-slitting is introduced as a means of releasing all in-plane stress components. The dual-axis ESPI system uses diagonal-mirror and shutter devices to provide surface displacement measurements in orthogonal in-plane directions. The combination of the cross-slit and dual-axis measurement gives isotropic sensitivity to the in-plane residual stress components. Experimental measurements are described that illustrate the capability and effectiveness of the cross-slitting/ESPI technique.

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Notes

  1. In a recently published paper, Montay et al. [13] presented an interesting ESPI procedure where subsurface stresses were determined for the case of non-uniform stresses along the length of a single slot.

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Acknowledgments

This work was financially supported by the Natural Science and Engineering Research Council of Canada (NSERC).

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of British Columbia, Vancouver, V6T 1Z4, Canada

    G. S. Schajer (SEM member) & Y. An (SEM member)

Authors
  1. G. S. Schajer
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  2. Y. An
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Correspondence to G. S. Schajer.

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Schajer, G.S., An, Y. Residual Stress Determination Using Cross-Slitting and Dual-Axis ESPI. Exp Mech 50, 169–177 (2010). https://doi.org/10.1007/s11340-009-9317-7

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