Figure 4: Projection in
the \(y,z\) plane of segmented microfractures for the untreated sample
[ACfresh02]. Orange ellipses show the onset of localization, pink
ellipses indicate formation of additional localized zone, completing the
radial pattern. Letters refer to the stress-strain steps in Table 3.
Color-coding shows the local fracture aperture at each voxel. See Figure
S5 in SI for zip file of high resolution images.
Table 4: Differential
stress, \(\sigma\), and axial strain, \(\epsilon\), for each μCT
sub-volume in the heat-treated sample [ACHT01]. Letters A-P refer to
the image volumes shown in Figure 5. Localization was first seen in scan
H along a shear zone that subsequently arrested when microcracks
localized along a more favorably-oriented damage zone in scan K, along
which the sample eventually failed.