Journal ArticleDOI
Discontinuous crack-bridging model for fracture toughness analysis of nacre
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TLDR
In this article, a microstructure-based fracture mechanics model is presented to investigate the toughening effect due to the crack-bridging mechanism of platelets, and some guidelines for the biomimetic design of novel materials are proposed based on their theoretical analysis.Abstract:
Studying the structure–property relation of biological materials can not only provide insight into the physical mechanisms underlying their superior properties and functions but also benefit the design and fabrication of advanced biomimetic materials. In this paper, we present a microstructure-based fracture mechanics model to investigate the toughening effect due to the crack-bridging mechanism of platelets. Our theoretical analysis demonstrates the crucial contribution of this mechanism to the high toughness of nacre. It is found that the fracture toughness of nacre exhibits distinct dependence on the sizes of platelets, and the optimized ranges for the thickness and length of platelets required to achieve higher fracture toughness are given. In addition, the effects of such factors as the mechanical properties of the organic phase (or interfaces), the effective elastic modulus of nacre, and the stacking pattern of platelets are also examined. Finally, some guidelines for the biomimetic design of novel materials are proposed based on our theoretical analysis.read more
Citations
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Journal ArticleDOI
Synthetic nacre by predesigned matrix-directed mineralization
Li-Bo Mao,Huai-Ling Gao,Hong-Bin Yao,Lei Liu,Lei Liu,Helmut Cölfen,Gang Liu,Si-Ming Chen,Shi-Kuo Li,You-Xian Yan,Yang-Yi Liu,Shu-Hong Yu +11 more
TL;DR: A mesoscale “assembly-and-mineralization” approach inspired by the natural process in mollusks is described to fabricate bulk synthetic nacre that highly resembles both the chemical composition and the hierarchical structure of natural nacre.
Journal ArticleDOI
Bimaterial 3D printing and numerical analysis of bio-inspired composite structures under in-plane and transverse loadings
TL;DR: In this paper, the hierarchical structure of natural nacre is mimicked to produce multilayer composite laminates assembled from three dimensional polygonal tablets bonded with organic adhesives.
Journal ArticleDOI
Electrically assisted 3D printing of nacre-inspired structures with self-sensing capability
TL;DR: This study highlights interesting possibilities for bioinspired structures, with integrated mechanical reinforcement and electrical self-sensing capabilities for biomedical applications, aerospace engineering, as well as military and sports armors.
Journal ArticleDOI
Designing nacre-like materials for simultaneous stiffness, strength and toughness: Optimum materials, composition, microstructure and size
TL;DR: In this article, a multi-objective optimization for simultaneous high stiffness, strength and energy absorption in staggered composites is proposed, which includes material properties for inclusions and matrix as design variables.
Journal ArticleDOI
Toughening mechanisms in bioinspired multilayered materials
Sina Askarinejad,Nima Rahbar +1 more
TL;DR: It is shown that the roughness induced interactions between the organic matrix and aragonite platelet, represented in the model by asperity elements, play a key role in strength and toughness of abalone nacre.
References
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Book
The stress analysis of cracks handbook
TL;DR: The Stress Analysis of Cracks Handbook as mentioned in this paper provides a comprehensive, easy-to-access collection of elastic stress solutions for crack configurations, along with other relevant information, such as displacements, crack opening areas, basic stress functions source references, accuracy of solutions, and more.
Journal ArticleDOI
The conflicts between strength and toughness
TL;DR: This work focuses on the interplay between the mechanisms that individually contribute to strength and toughness, noting that these phenomena can originate from very different lengthscales in a material's structural architecture.
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Nature’s hierarchical materials
Peter Fratzl,Richard Weinkamer +1 more
TL;DR: In this paper, the basic principles involved in designing hierarchical biological materials, such as cellular and composite architectures, adapative growth and as well as remodeling, are discussed, and examples that are found to utilize these strategies include wood, bone, tendon, and glass sponges.
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Biological materials: Structure and mechanical properties
TL;DR: In this article, the basic building blocks are described, starting with the 20 amino acids and proceeding to polypeptides, polysaccharides, and polyprotein-saccharide.
Journal ArticleDOI
Materials become insensitive to flaws at nanoscale: lessons from nature.
TL;DR: It is shown that the nanocomposites in nature exhibit a generic mechanical structure in which the nanometer size of mineral particles is selected to ensure optimum strength and maximum tolerance of flaws (robustness) and the widely used engineering concept of stress concentration at flaws is no longer valid for nanomaterial design.