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

Authors
  • Eremin, A. V.1
  • Smirnova, A. S.1, 2
  • Panin, S. V.1, 2
  • Pochivalov, Yu. I.1
  • 1 Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055, Russia , Tomsk (Russia)
  • 2 Tomsk Polytechnic University, Tomsk, 634050, Russia , Tomsk (Russia)
Type
Published Article
Journal
Russian Journal of Nondestructive Testing
Publisher
Pleiades Publishing
Publication Date
May 01, 2019
Volume
55
Issue
5
Pages
384–392
Identifiers
DOI: 10.1134/S1061830919050036
Source
Springer Nature
Keywords
License
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Abstract

AbstractWe 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.

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