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- Title
Optical measurement of residual stress induced by shot peening.
- Authors
Gryzagoridis, J.; Findeis, D.
- Abstract
This paper reports on an optical method used to confirm the presence and determine the magnitude of residual stress resulting from the shot peening of one of the surfaces of metallic specimens, made from low-carbon steel slender rectangular bars. A prototype laser-based shearography system, also capable of performing the electronic speckle pattern interferometry (E5PI) technique, was used to capture interferograms of the deflection and gradient curves of the surfaces of the steel bars. The specimens were fashioned as built-in cantilever beams and were subjected to loads at their tip or free end. The steel bars were annealed, prior to shot peening one of their surfaces, with a view to eliminate any influence from residual stress that would have been induced due to their cold drawn manufacturing process. Analysis of the shearography and ESPI interferograms confirmed the presence and yielded the level of induced surface compressive residual stress, referenced to the degree or intensity of the shot peening process. In addition, the process appeared capable of determining the Young's modulus value of the material.
- Subjects
RESIDUAL stresses; SHEAROGRAPHY; CANTILEVERS; SHOT peening; YOUNG'S modulus
- Publication
Insight: Non-Destructive Testing & Condition Monitoring, 2018, Vol 60, Issue 5, p247
- ISSN
1354-2575
- Publication type
Article
- DOI
10.1784/insi.2018.60.5.247