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Crack monitoring in resonance fatigue testing of welded specimens using digital image correlation
Publikationstyp
Journal Article
Date Issued
2019
Sprache
English
Author(s)
TORE-URI
Journal
Volume
2019
Issue
151
Article Number
e60390
Citation
Journal of Visualized Experiments 151 (2019): e60390 (2019)
Publisher DOI
Scopus ID
A procedure using digital image correlation (DIC) to detect cracks on welded specimens during fatigue tests on resonance testing machines is presented. It is intended as a practical and reproducible procedure to identify macroscopic cracks at an early stage and monitor crack propagation during fatigue tests. It consists of strain field measurements at the weld using DIC. Images are taken at fixed load cycle intervals. Cracks become visible in the computed strain field as elevated strains. This way, the whole width of a small-scale specimen can be monitored to detect where and when a crack initiates. Subsequently, it is possible to monitor the development of the crack length. Because the resulting images are saved, the results are verifiable and comparable. The procedure is limited to cracks initiating at the surface and is intended for fatigue tests under laboratory conditions. By visualizing the crack, the presented procedure allows direct observation of macrocracks from their formation until rupture of the specimen.
Subjects
Beach marks
Crack propagation measurement
Digital image correlation
Engineering
Fatigue test
Issue 151
Resonance testing machine
Technical crack
Welded specimen