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Figure 3
Influence of hydration state on the structural response of dactyl club subjected to impact. (a) 3D distribution of main crack systems within `dry' dactyl club. (b) Crack system with a different perspective to (a). The isolated crack systems indicate that the crack nucleated at multiple sites. A major crack system was formed under the loading point and propagated into the periodic region, which can be easily spotted from the representative slice (c) of the 3D reconstruction results. A zigzag-shaped crack path can be identified in the periodic region showing a characteristic crack deflection phenomenon found in this region. (d)–(e) 3D distribution of the main crack systems within the `hydrated' dactyl club. In contrast, no major cracks developed right under the loading point but several separate cracks formed around the loading point. The main cracks propagated to the interface of the impact surface and impact region and are then significantly deflected, which can also be easily spotted from representative slices (f)–(g) of 3D reconstruction.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 3| May 2022| Pages 775-786
https://doi.org/10.1107/S1600577522001217
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