Publisher DOI: 10.3791/60390
Title: Crack monitoring in resonance fatigue testing of welded specimens using digital image correlation
Language: English
Authors: Friedrich, Nils 
Ehlers, Sören 
Keywords: Beach marks; Crack propagation measurement; Digital image correlation; Engineering; Fatigue test; Issue 151; Resonance testing machine; Technical crack; Welded specimen
Issue Date: 2019
Source: Journal of Visualized Experiments 151 (2019): e60390 (2019)
Abstract (english): 
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.
ISSN: 1940-087X
Journal: JoVE 
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Document Type: Article
Project: Ansatz zur Berücksichtigung von Schweißeigenspannungen bei der Ermüdungsfestigkeitsbewertung mittels direkter numerischer Simulation 
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