An artful microstructure in nacre: Superior resistance to fatigue deformation

•Three-point bending fatigue behavior of nacre in different parts of Pinctada maxima shell was investigated.•The marginal part with the thickest convex lens-like nacre exhibits the best fatigue resistance.•The special convex lens-like shape, the denser nano-asperities, and the larger mineral bridges...

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Bibliographic Details
Published in:International journal of fatigue 2022-04, Vol.157, p.106705, Article 106705
Main Authors: Ji, H.M., Li, X.W., Chen, D.L.
Format: Article
Language:English
Subjects:
Carbon monoxide
Convex lens-like nacre
Crack propagation
Cyclic loads
Fatigue
Fatigue strength
Lenses
Materials fatigue
Mechanical properties
Mineral bridges
Nacre
Nano-asperities
Pinctada maxima shell
Platelets (materials)
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Summary:•Three-point bending fatigue behavior of nacre in different parts of Pinctada maxima shell was investigated.•The marginal part with the thickest convex lens-like nacre exhibits the best fatigue resistance.•The special convex lens-like shape, the denser nano-asperities, and the larger mineral bridges may effectively arrest crack propagation, thus contributing to the unique mechanical performance of CO layer. The aim of this study was to identify fatigue resistance of nacre. The Pinctada maxima shell presents nacreous structures with brick-like (BR) and convex lens-like (CO) platelets in the outer and inner layers, respectively. The marginal part with the thickest CO layer exhibits the best fatigue resistance, since the CO layer can effectively resist the interfacial separation under cyclic loads. The special convex lens-like shape, the denser nano-asperities, and the larger mineral bridges may effectively arrest crack propagation, thus contributing to the unique mechanical performance of CO layer.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106705