Identification of a crack propagation law by digital image correlation

Abstract : It is proposed to use digital image correlation (DIC) to identify parameters governing crack propagation of commercially pure titanium. To achieve this goal, crack tip location, stress intensity factor, T-stress and plastic zone size are sought. Most of the DIC approaches are based upon local analyses of displacements, and their subsequent projection onto a set of mechanically relevant fields. It is proposed to perform these two sequential steps in a unique (and integrated) way, and to compare the results with a global approach to DIC with subsequent post-processing. A priori performances of two global approaches are compared, and a propagation law is identified form the series of raw images of a fatigue test on commercially pure titanium with the integrated approach that yields better results.
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Florent Mathieu, François Hild, Stéphane Roux. Identification of a crack propagation law by digital image correlation. International Journal of Fatigue, Elsevier, 2012, 36, pp.146-154. ⟨10.1016/j.ijfatigue.2011.08.004⟩. ⟨hal-00694317⟩

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