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Article Dans Une Revue Communications Materials Année : 2020

Nacre toughening due to cooperative plastic deformation of stacks of co-oriented aragonite platelets

Résumé

Nacre's structure-property relationships have been a source of inspiration for designing advanced functional materials with both high strength and toughness. These outstanding mechanical properties have been mostly attributed to the interplay between aragonite pla-telets and organic matrices in the typical brick-and-mortar structure. Here, we show that crystallographically co-oriented stacks of aragonite platelets, in both columnar and sheet nacre, define another hierarchical level that contributes to the toughening of nacre. By correlating piezo-Raman and micro-indentation results, we quantify the residual strain energy associated with strain hardening capacity. Our findings suggest that the aragonite stacks, with characteristic dimensions of around 20 µm, effectively store energy through cooperative plastic deformation. The existence of a larger length scale beyond the brick-and-mortar structure offers an opportunity for a more efficient implementation of biomimetic design.
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Dates et versions

hal-02988973 , version 1 (12-11-2020)

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Hyun-Chae Loh, Thibaut Divoux, Bernd Gludovatz, Pupa U P A Gilbert, Robert O Ritchie, et al.. Nacre toughening due to cooperative plastic deformation of stacks of co-oriented aragonite platelets. Communications Materials, 2020, 1 (1), ⟨10.1038/s43246-020-00078-y⟩. ⟨hal-02988973⟩
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