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.
Highlights
N umerous engineering components and structures are subjected to biaxial loading conditions
A new method for measuring displacement and strain crack-tip fields on fatigue cracks grown following the previous procedure is shown. This method is based on high-magnification Digital Image Correlation (DIC) technique
I n order to validate the experimental setup described in the previous sections, DIC strain data were compared with strain information measured with a biaxial extensometer
Summary
N umerous engineering components and structures are subjected to biaxial loading conditions. In these cases two principal stresses and strains change in time, both in magnitude and directions. The aim of this work is to develop a methodology capable of characterising crack-tip fields under biaxial conditions. A procedure to enforce the crack initiation at a specific location without changing the fatigue life is explained. A new method for measuring displacement and strain crack-tip fields on fatigue cracks grown following the previous procedure is shown. This method is based on high-magnification Digital Image Correlation (DIC) technique. Surface finish required by DIC was achieved by electro-spray technique
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
