Abstract
Abstract Nacre is a hierarchical bio-composite with excellent mechanical behavior. Interfaces between nacreous tablets are essential to its outstanding mechanical behavior. This study investigated the interfacial crack growth between nacreous tablets of red abalone shells using torsion tests. Both dry and hydrated nacre were prepared and tested, and nacre with and without growth layers were compared. Results indicated that both dry and hydrated nacre failed catastrophically under torsion. Dry nacre exhibited flat fractural surfaces, whereas hydrated nacre exhibited spiral fractural surfaces. Dry nacre with growth layers exhibited cracks kinking ranging from nacre to spherulites and the green matrix, whereas cracks of hydrated nacre with growth layers were confined within spherulites of growth layers. By using the high-resolution torsion experiment system, avalanches between sliding tablets were discovered, statistics of which agreed with predictions from the mean-field model. Torsion is an effective method in probing interfacial crack behavior between nacreous tablets. The findings could promote the design and creation of artificial high-performance laminated composites.
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