Thickness-dependent mechanical properties of nacre in Cristaria plicata shell: Critical role of interfaces

Liang, Shuang; Ji, H.M.; Li, X.W.

doi:10.1016/j.jmst.2019.10.039

Cited by 22 publications

(16 citation statements)

References 56 publications

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“…Because of the existence of the process zone, the strength of the nacreous structure will be actually governed by the average stress in process zone rather than the peak stress. The average stress in the process zone (σ Pc ) can be expressed by where σ b is the bending strength of specimens, δ is the width of process zone, and h is the specimen thickness. Herein, the σ b is equal to the tensile stress at the bottom of specimens (σ) for Up.…”

Section: Discussionmentioning

confidence: 99%

“…The fracture energy for Up is also higher than that for Down, which can be understood from following two aspects. First, sliding of platelets takes place in N during the formation of microcracks for Up, while granules in H and prims in P could not slide in Down, causing that more energy is dissipated for Up . Second, several other toughening mechanisms, such as crack deflection, pulling out of platelets, and surface nanoasperities, could further enhance the fracture resistance in N, thus resulting in a larger fracture energy .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…First, sliding of platelets takes place in N during the formation of microcracks for Up, while granules in H and prims in P could not slide in Down, causing that more energy is dissipated for Up. 46 Second, several other toughening mechanisms, such as crack deflection, pulling out of platelets, and surface nanoasperities, could further enhance the fracture resistance in N, thus resulting in a larger fracture energy. 44 In short, the specimens in Up exhibit a higher bending strength and fracture energy, since the nacreous structure is both stronger and tougher than the homogeneous structure.…”

Section: Discussionmentioning

confidence: 99%

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An Ingenious Microstructure Arrangement in Deep-Sea Nautilus Shell against the Harsh Environment

Liang

et al. 2021

ACS Biomater. Sci. Eng.

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Mollusk shells generally consist of several macrolayers with different microstructures. To explore the specific role that different macro-layers play in the overall mechanical properties of shells, the microstructures, hardness distribution, and three-point bending behavior in the deep-sea Nautilus shell were investigated. It is found that the shell presents a hierarchical structure comprising three layers in thickness, that is, the outer, middle, and inner layers, which exhibit homogeneous, prismatic, and nacreous structures, respectively. Among them, the homogeneous structure in the outer layer is harder, which is beneficial for the shell to enhance resistance to wear and perforation. Furthermore, both the bending strength and fracture energy for group Up (loading from outer to inner surfaces) are far higher than those for group Down (loading from inner to outer surfaces), indicating that the inner nacreous layer is not only stronger but also tougher. Cracks tend to deflect at the interfaces in nacreous structure, and nacreous structure is thereby more resistant to breakage. Hence, the nacreous structure in the inner layer could protect the shell from breaking catastrophically in the deep sea with high pressure. In brief, the combination of a harder outside layer and a tougher inside layer provides an effective protective structure for the deep-sea shell, and the excellent environment adaptability of Nautilus shell can thus be interpreted in terms of its ingenious microstructure arrangement.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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An Ingenious Microstructure Arrangement in Deep-Sea Nautilus Shell against the Harsh Environment

Liang

et al. 2021

ACS Biomater. Sci. Eng.

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“…Therefore, there should be an obvious difference in the arrangement of the organic interfaces in the above two structures. In addition, the organic matrix is present not only at interfaces but also in the microstructural components of the above structures as the adhesive. − However, it is still unclear whether the different arrangements of organic interfaces in these two kinds of structures have a distinctive influence on the relevant mechanical properties of materials.…”

Section: Introductionmentioning

confidence: 99%

Distinctive Impact of Heat Treatment on the Mechanical Behavior of Nacreous and Crossed-Lamellar Structures in Biological Shells: Critical Role of Organic Matrix

Liang

et al. 2022

ACS Biomater. Sci. Eng.

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As biological ceramic composites, mollusk shells exhibit an excellent strength−toughness combination that should be dependent on aragonite/organic matrix interfaces. The mechanical properties and fracture mechanisms of the nacreous structure in the Cristaria plicata (C. plicata) shell and crossed-lamellar structures in the Cymbiola nobilis (C. nobilis) shell were investigated, focusing on the critical role of the organic matrix/aragonite interface bonding that can be adjusted by heat treatments. It is found that heat treatments have a negative impact on the fracture behavior of the nacreous structure in the C. plicata shell, and both the bending and shear properties decrease with increasing heat-treatment temperature because of the loss of water and organic matrix. In contrast, for the crossed-lamellar structure in C. nobilis shell, the water loss in heat treatment slightly decreases its bending properties. When the organic matrix is melted after an appropriate heat treatment at 300°C for 15 min, its bending properties can be greatly enhanced; in this case, remarkable toughening mechanisms involving crack deflection and the fiber pull-out are exhibited, although the interfacial bonding strength reduces. Therefore, an appropriate heat treatment would bring about a positive impact on the fracture behavior of crossed-lamellar structure in the C. nobilis shell. The major research findings have provided an important inspiration that the inducement of moderately weak interfaces rather than all strong interfaces might enhance the comprehensive mechanical properties of fiber-reinforced ceramic composites.

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Specimen Size Effect of Tensile Behavior of Al-4.0 wt pct Cu Alloy Sheets: Effects of Precipitates and Cyclic Predeformation

Yan

Wang

Song

et al. 2021

Metall Mater Trans A

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Thickness-dependent mechanical properties of nacre in Cristaria plicata shell: Critical role of interfaces

Cited by 22 publications

References 56 publications

An Ingenious Microstructure Arrangement in Deep-Sea Nautilus Shell against the Harsh Environment

An Ingenious Microstructure Arrangement in Deep-Sea Nautilus Shell against the Harsh Environment

Distinctive Impact of Heat Treatment on the Mechanical Behavior of Nacreous and Crossed-Lamellar Structures in Biological Shells: Critical Role of Organic Matrix

Specimen Size Effect of Tensile Behavior of Al-4.0 wt pct Cu Alloy Sheets: Effects of Precipitates and Cyclic Predeformation

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