Residual stress measurement on shot peened samples using FIB-DIC

Enrico Salvati, Matteo Benedetti, Tan Sui, Alexander M. Korsunsky

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)

Abstract

Shot peening is an established technique for improving the fatigue resistance of mechanical components by performing a deformation treatment that causes local near surface plastic deformation and introduces a layer of compressive residual stress. The knowledge of the residual stress distribution plays a crucial role in the correct prediction of fatigue life during service in the context of engineering design. Reliable prediction of safe fatigue life requires knowing how the residual stress state obtained after shot peening depends on the sample geometry, e.g. the presence of notches, and how it evolves during cyclic loading. The Focused Ion Beam milling coupled with Digital Image Correlation (DIC) analysis of SEM images (the FIB-DIC method) has been shown to be an efficient technique for stress evaluation at the (sub)micron-scale. The residual stresses in the vicinity of shot-peened rounded notch tips in Al-7075-T651 samples were studied as a function of notch radii (ρ = 2, 0.5, 0.15 mm). The interpretation of the results is aided by comparison with a simple numerical model of eigenstrain cylinder.

Original languageEnglish
Title of host publicationResidual Stress, Thermomechanics and Infrared Imaging, Hybrid Techniques and Inverse Problems - Proceedings of the 2015 Annual Conference on Experimental and Applied Mechanics
EditorsGary Schajer, Sven Bossuyt, Alberto Carpinteri
PublisherSpringer New York LLC
Pages275-283
Number of pages9
ISBN (Print)9783319217642
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2015 - Costa Mesa, United States
Duration: 8 Jun 201511 Jun 2015

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Volume9
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

ConferenceSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2015
Country/TerritoryUnited States
CityCosta Mesa
Period8/06/1511/06/15

Keywords

  • Eigenstrain
  • FIB-DIC
  • Residual stress
  • SEM
  • Shot peening

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