In Fig. 12b the square root of the normalised value of the average strain energy density, W, is plotted versus the notch tip radius. The scatter approximately ranges from 0.8 to 1.2 with few exceptions.The dispersion of the data with respect to the reference value Wc seems to be well-balanced. Being the authors aware that the non-conventional applications of the SED to this material is only a rough first fracture strength estimation, future efforts have to be devoted to consider the real material behaviour to improvingthe fracture assessment in presence of non linearities, at least for small scale yielding.