62 G.L.G. Gonzáles et al. Fig. 8.8 (a) COD measurements along crack flanks and (b) strain field map for the point before the OL Fig. 8.9 (a) COD measurements along crack flanks and (b) strain field map for the point after the OL Fig. 8.10 (a) COD measurements along crack flanks and (b) strain field map for the point OLC324 kcycles 8.13 the cameras were moved to the left to monitor the crack growth. In this way, the OL location is outside of field of view of the cameras (right of the Figs. 8.12b and 8.13b). For each stereo camera configuration, a stereo calibration procedure was performed. The behavior exhibited in Figs. 8.11, 8.12 and 8.13 is compatible with the phenomenon of discontinuous closure reported by Fleck [1]. Moreover, the inspection of the strain field maps extracted from DIC analysis illustrates the high crack-tip plasticity created near the OL location.
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