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High magnification crack-tip field characterisation under biaxial conditions

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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

ABSTRACT
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
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RPA Switzerland

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