Applying Digital Image Correlation Technique for Studying the Growth of a Fatigue Crack in VT23 Titanium Alloy Welded Joints

A. V. Eremin, A. S. Smirnova, S. V. Panin, Yu I. Pochivalov

Research output: Contribution to journalArticle

Abstract

Abstract: We present results of applying a combined approach to studying fatigue fracture processes in VT23 titanium alloy with a laser-welded joint. The approach involves fractographic examination using scanning electron microscopy and analysis of strain fields at the sample surface (using digital image correlation technique). Samples with permanent connections are presented in two forms: in the initial state and subjected to post-welding treatment by ultrasonic forging and pulsed high-energy impact. It is shown that applying the proposed integrated approach to the analysis of fatigue fracture has allowed identifying features in the development of processes of nucleation and propagation of cracks and locating them in the bulk of the material, as well as determining running times after which transition from one stage to another takes place: crack initiation, stable growth, and rupture. The results have made it possible to explain the mechanisms of how post-welding treatment of permanent joints affects their fatigue properties.

Original languageEnglish
Pages (from-to)384-392
Number of pages9
JournalRussian Journal of Nondestructive Testing
Volume55
Issue number5
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • digital image correlation method
  • fatigue
  • fractographic examination
  • laser welding
  • post-welding treatment
  • VT23 titanium alloy
  • welded joints

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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