Abstract
An improved moiré interferometry was used to record simultaneously both the vertical and horizontal displacements associated with stable crack growth in uniaxially and biaxially loaded 2024–0 and 2024-T3 aluminum, single edge notched specimens. For stable crack growth up to 5 mm, the vertical displacement field showed the dominance of the HRR field but the HRR field was detected in the horizontal displacement only at the initial stage of loading. The far and near field J-integrals were path independent and yielded the correct crack tip displacements only at the initial stage of loading in the horizontal direction and at the terminal stage of loading in the vertical displacement field. The preliminary results indicate that J-characterization of a moving crack, including that of rapid propagation, may not be valid for these ductile materials for this specimen configuration.
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