Abstract
The nacre-like biomaterials, which are being studied more and more by scientists, exhibit a perfect combination of toughness and strength thanks to their hierarchical microstructure made up of alternately soft proteins and hard mineral tablets. Recent investigations have revealed a correlation between fracture toughness and fracture patterns such like crack bifurcation and crack deflection. However, the relationship between the fracture patterns and toughness of the nacre-like biomaterials hence requires more investigation. In this study, we investigated the Mode I crack extension and microstructure deformation near the crack tip, in small scale yielding condition, using incremental finite element method. We identified the microstructure-dependent brittle-ductile transition and the 3 associated fracture patterns. We discovered the mechanism of how microstructure affects fracture patterns and brittle-ductile transition, and hence fracture toughness. These findings will help to explain the toughening mechanism associated with crack extension, which will provide a clue to the design of nacre-like artificial materials for high applicability.
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