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 Y.I.1
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Affiliations:
- Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences
- Tomsk Polytechnic University
- Issue: Vol 55, No 5 (2019)
- Pages: 384-392
- Section: Optical Methods
- URL: https://journals.rcsi.science/1061-8309/article/view/181870
- DOI: https://doi.org/10.1134/S1061830919050036
- ID: 181870
Cite item
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.
About the authors
A. V. Eremin
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences
Author for correspondence.
Email: ave@ispms.ru
Russian Federation, Tomsk, 634055
A. S. Smirnova
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences; Tomsk Polytechnic University
Author for correspondence.
Email: naso@mail2000.ru
Russian Federation, Tomsk, 634055; Tomsk, 634050
S. V. Panin
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences; Tomsk Polytechnic University
Email: naso@mail2000.ru
Russian Federation, Tomsk, 634055; Tomsk, 634050
Yu. I. Pochivalov
Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences
Email: naso@mail2000.ru
Russian Federation, Tomsk, 634055