Structure, Scaling, and Performance of Natural Micro- and Nanocomposites (English)

In: BioNanoScience   ;  1 ,  1  ;  53-61  ;  2011

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Abstract Natural materials boast remarkable mechanical performances in some cases unmatched by their synthetic counterparts, and for this reason, they have become an inspiration for the development of new materials. In high-performance natural materials such as nacre, bone, or teeth, stiffness and toughness are achieved with the staggered microstructure, where stiff inclusions of high aspect ratio are embedded in a softer matrix. While the modulus and strength of the staggered structure is well understood, fracture toughness and scaling remains unclear. In this work, a fracture model based on the fundamental micromechanics of the staggered structure is presented. The model captures crack bridging and process zone toughening, and explicitly shows how these toughening processes are the most efficient with high concentrations of small tablets of high aspect ratio. In particular, a desirable non-steady cracking regime can be achieved with specific requirements for structure and interface properties, which are presented in detail. These attractive toughening mechanisms are only possible if the tablets themselves do not fracture. The benefits of small size have been explored in the past, but here, we show for the first time how the effects of a stress singularity generated by the junctions between the tablets can be alleviated by the softer interfaces, provided that a “soft wrap” condition is met. The models provide new insights into the optimization and scaling of natural and biomimetic composites.

Table of contents – Volume 1, Issue 1

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The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

1
New Insight on Bio-sensing by Nano-fabricated Memristors
Sacchetto, Davide / Doucey, Marie-Agnès / Micheli, Giovanni / Leblebici, Yusuf / Carrara, Sandro | 2011
4
Influence of Gold Nanoparticles on Radiation Dose Enhancement and Cellular Migration in Microbeam-Irradiated Cells
Rahman, Wan Nordiana / Davidson, Robert / Yagi, Naoto / Bansal, Vipul / Geso, Moshi / Darby, Ian | 2011
14
Dynamic Failure of a Lamina Meshwork in Cell Nuclei under Extreme Mechanical Deformation
Qin, Zhao / Buehler, Markus J. | 2011
24
Material Memristive Device Circuits with Synaptic Plasticity: Learning and Memory
Erokhin, Victor / Berzina, Tatiana / Camorani, Paolo / Smerieri, Anteo / Vavoulis, Dimitris / Feng, Jianfeng / Fontana, Marco P. | 2011
31
Self-Assembled Peptide Nanotubes as an Etching Material for the Rapid Fabrication of Silicon Wires
Larsen, Martin B. / Andersen, Karsten B. / Svendsen, Winnie E. / Castillo-León, Jaime | 2011
38
Detection of Aflatoxin B1 with a Label-Free Ellipsometry Immunosensor
Nabok, Alexei V. / Mustafa, Mohd Kamarulzaki / Tsargorodskaya, Anna / Starodub, Nikolaj F. | 2011
46
Electroanalysis of Cytochrome P450 3A4 Catalytic Properties with Nanostructured Electrodes: The Influence of Vitamin B Group on Diclofenac Metabolism
Makhova, Anna A. / Shumyantseva, Victoria V. / Shich, Evgeniya V. / Bulko, Tatyana V. / Kukes, Vladimir G. / Sizova, Oksana S. / Ramenskaya, Galina V. / Usanov, Sergei A. / Archakov, Alexander I. | 2011
53
Structure, Scaling, and Performance of Natural Micro- and Nanocomposites
Bekah, Sacheen / Rabiei, Reza / Barthelat, Francois | 2011
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