J4 ›› 2016, Vol. 13 ›› Issue (4): 641-649.doi: 10.1016/S1672-6529(16)60335-9

• 论文 • 上一篇    下一篇

Unique Structure and Mechanical Property of Dabryanus Scale

Mei Yu, Haoran Liu, Jianhua Liu, Songmei Li   

  1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  • 收稿日期:2016-03-12 修回日期:2016-09-12 出版日期:2016-10-10 发布日期:2016-10-10
  • 通讯作者: Mei Yu E-mail:yumei@buaa.edu.cn
  • 作者简介:Mei Yu, Haoran Liu, Jianhua Liu, Songmei Li

Unique Structure and Mechanical Property of Dabryanus Scale

Mei Yu, Haoran Liu, Jianhua Liu, Songmei Li   

  1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  • Received:2016-03-12 Revised:2016-09-12 Online:2016-10-10 Published:2016-10-10
  • Contact: Mei Yu E-mail:yumei@buaa.edu.cn
  • About author:Mei Yu, Haoran Liu, Jianhua Liu, Songmei Li

摘要:

The structure and mechanical property of Dabryanus scale were investigated. Environmental Scanning Electron Microscopy (ESEM) and Transmission Electron Microscopy (TEM) were used to observe the scale structure. The scale has a discrete osseous layer which is composed of boat-like unit (due to the shape). The osseous layer is embedded into fibrillary layer, and the largest thickness ratio of osseous layer to fibrillary layer is about 7, much higher than those of other reported fish scales. Nanoindentation test was used to investigate mechanical property of the scale. Elastic modulus (Er) and hardness (H) of Dabryanus scale are much lower than those of other reported fish scales. Scale models were proposed and the principles of materials mechanics were used to analyze the mechanical properties of the Dabryanus scale. The boat-like unit in osseous layer makes the scale flexible while keeping a high thickness ratio of osseous layer to fibrillary layer, which increases the flexibility and protection capacity of the scale This study may provide new strategy for the design of flexible armor or flexible devices.

关键词: biological materials, microstructures, flexibility, Dabryanus scale, nanoindentation, structure-property relationship

Abstract:

The structure and mechanical property of Dabryanus scale were investigated. Environmental Scanning Electron Microscopy (ESEM) and Transmission Electron Microscopy (TEM) were used to observe the scale structure. The scale has a discrete osseous layer which is composed of boat-like unit (due to the shape). The osseous layer is embedded into fibrillary layer, and the largest thickness ratio of osseous layer to fibrillary layer is about 7, much higher than those of other reported fish scales. Nanoindentation test was used to investigate mechanical property of the scale. Elastic modulus (Er) and hardness (H) of Dabryanus scale are much lower than those of other reported fish scales. Scale models were proposed and the principles of materials mechanics were used to analyze the mechanical properties of the Dabryanus scale. The boat-like unit in osseous layer makes the scale flexible while keeping a high thickness ratio of osseous layer to fibrillary layer, which increases the flexibility and protection capacity of the scale This study may provide new strategy for the design of flexible armor or flexible devices.

Key words: biological materials, microstructures, flexibility, Dabryanus scale, nanoindentation, structure-property relationship