Combination of microscale hole-drilling and digital image correlation for local measurement of residual stresses in metallic samples

  1. A. Dorronsoro 12
  2. J.R. Páez 12
  3. J. Navarrete 12
  4. A. Pan 12
  5. E. Castaño 12
  6. J.M. Sánchez 12
  7. J.M. Martínez-Esnaola 12
  8. J. Alkorta 12
  1. 1 Universidad de Navarra, Tecnun
  2. 2 CEIT-BRTA . Donostia
Journal:
Revista española de mecánica de la fractura

ISSN: 2792-4246

Year of publication: 2022

Issue: 4

Pages: 89-94

Type: Article

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Abstract

In many practical situations, the distribution of residual stresses can have a paramount influence on the fatigue and fracture response of materials. In this paper, we describe a method for the local measurement of residual stresses. It consists of Digital Image Correlation (DIC) of Scanning Electron Microscope (SEM) images of a surface, before and after milling a slit using a Focused Ion Beam (FIB). The DIC algorithm used in this work is based on Fourier analysis, which can reach sub-pixel resolution. In order to calculate the internal stresses released during the milling process, the displacements detected with the DIC algorithm are fitted to Finite Element Method (FEM) simulations. Residual stresses measured by this method on a hard metal sample subjected to different laser surface treatments are successfully compared with X-ray diffraction measurements.

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