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나노 구조 물리 연구단
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Nanotwin-governed toughening mechanism in hierarchically structured biological materials

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Title
Nanotwin-governed toughening mechanism in hierarchically structured biological materials
Author(s)
Shin Y.A.; Yin S.; Li X.; Lee S.; Moon S.; Jiwon Jeong; Kwon M.; Yoo S.J.; Young-Min Kim; Zhang T.; Gao H.; Oh S.H.
Publication Date
2016-02
Journal
NATURE COMMUNICATIONS, v.7, no., pp.10772 -
Publisher
NATURE PUBLISHING GROUP
Abstract
As a natural biocomposite, Strombus gigas, commonly known as the giant pink queen conch shell, exhibits outstanding mechanical properties, especially a high fracture toughness. It is known that the basic building block of conch shell contains a high density of growth twins with average thickness of several nanometres, but their effects on the mechanical properties of the shell remain mysterious. Here we reveal a toughening mechanism governed by nanoscale twins in the conch shell. A combination of in situ fracture experiments inside a transmission electron microscope, large-scale atomistic simulations and finite element modelling show that the twin boundaries can effectively block crack propagation by inducing phase transformation and delocalization of deformation around the crack tip. This mechanism leads to an increase in fracture energy of the basic building block by one order of magnitude, and contributes significantly to that of the overall structure via structural hierarchy.
URI
http://pr.ibs.re.kr/handle/8788114/2552
DOI
10.1038/ncomms10772
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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