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High magnification crack-tip field characterisation under biaxial conditions

Author(s): B. Moreno | P. Lopez-Crespo | J. Zapatero

Journal: Frattura ed Integrità Strutturale
ISSN 1971-8993

Volume: 7;
Issue: 25;
Start page: 145;
Date: 2013;
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Keywords: Biaxial fatigue | Digital image correlation | Crack-tip strain field | Electro-spray

This work presents a novel methodology for characterising fatigue cracks under biaxial conditions. The methodology uses high magnification Digital Image Correlation (DIC) technique for measuring displacement and strain crack-tip fields. By applying micro-speckle pattern on the metal surface it is possible to achieve high magnification for DIC technique. The speckles were created by electro-spray technique. The validity of this novel technique is demonstrated by direct comparison with standard extensometer measurements, under tension-compression and torsion conditions. In order to image the correct region, the notch effect on the fatigue life was also evaluated.

Tango Rapperswil
Tango Rapperswil

RPA Switzerland

Robotic Process Automation Switzerland