Further studies on the hrr field of a moving crack, an experimental analysis

An improved moire interferometry was used to record simultaneously both the vertical and horizontal displacements associated with stable crack growth in uniaxially loaded 5052H32 aluminum, single-edge-notched specimens. For stable crack growth up to 2 mm, the vertical displacement field showed the dominance of the HRR field. 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 during this incremental crack extension period. These and previous results involving 2024-0 and 2024-T3 aluminum specimens indicate that J-characterization of a crack is not valid for these ductile materials in this specimen configuration.