Figure 13: Evolution with
strain for (a ) correlation length \(\xi\), (b )
microcrack volume exponent \(\beta\), and (c ) fractal dimension\(D\), for the untreated (blue) and heat-treated (orange) samples. Error
bars show (b ) the standard error (\(\beta/\sqrt{N}\)) of the
maximum likelihood estimate of \(\beta\), where \(N\) is the number of
cracks, and (c ) the 95% confidence intervals of the linear
regression fit for \(D\). Dash-dot lines show the strain at which each
sample failed, while dashed lines show the onset of localization as seen
in the μCT volumes.