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Structure and roles of the various layers in the shells of conch Conus litteratus

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Abstract

Mollusc shells are renowned for their mechanical strength and toughness. To better understand the mineralization process of the shell, structure of the body whorl and base of Conus litteratus (Conus shell) were in detail investigated by using scanning electron microscopy. Three-point bending tests were taken to demonstrate that each layer of crossed-lamellar structures is indispensable to enhance the whole strength of the shells. The results show that the conch shell is composed of hierarchical structure from nano scale to macro scale, and the basic constituent is long rod-shaped aragonite. Different positions of the shell have varied structures, and the base is more complicated than the body whorl. The mechanical properties of Conus are highly anisotropic and the arrangement of middle layer has a great influence on the bending strength. The outer and inner layers are very thin but play a protective role for the middle layer.

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Abbreviations

TP:

Transverse sample, loading on the P plane

LP:

Longitudinal sample, loading on the P plane

TP-M:

Middle layer of TP

LP-M:

Middle layer of LP

TP-OM:

Transverse sample that machined off the inner layer

TP-MI:

Transverse sample that machined off the outer layer

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Authors and Affiliations

  1. College of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Xiaojuan Hong & Xiaoxiang Wang

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  1. Xiaojuan Hong
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  2. Xiaoxiang Wang
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Correspondence to Xiaoxiang Wang.

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Hong, X., Wang, X. Structure and roles of the various layers in the shells of conch Conus litteratus. J Bionic Eng 13, 124–131 (2016). https://doi.org/10.1016/S1672-6529(14)60166-9

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