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Acta Mechanica Sinica

, Volume 31, Issue 3, pp 364–372 | Cite as

Hierarchical structure observation and nanoindentation size effect characterization for a limnetic shell

  • Jingru Song
  • Cuncai Fan
  • Hansong Ma
  • Yueguang WeiEmail author
Research Paper

Abstract

In the present research, hierarchical structure observation and mechanical property characterization for a type of biomaterial are carried out. The investigated biomaterial is Hyriopsis cumingii, a typical limnetic shell, which consists of two different structural layers, a prismatic “pillar” structure and a nacreous “brick and mortar” structure. The prismatic layer looks like a “pillar forest” with variation-section pillars sized on the order of several tens of microns. The nacreous material looks like a “brick wall” with bricks sized on the order of several microns. Both pillars and bricks are composed of nanoparticles. The mechanical properties of the hierarchical biomaterial are measured by using the nanoindentation test. Hardness and modulus are measured for both the nacre layer and the prismatic layer, respectively. The nanoindentation size effects for the hierarchical structural materials are investigated experimentally. The results show that the prismatic nanostructured material has a higher stiffness and hardness than the nacre nanostructured material. In addition, the nanoindentation size effects for the hierarchical structural materials are described theoretically, by using the trans-scale mechanics theory considering both strain gradient effect and the surface/interface effect. The modeling results are consistent with experimental ones.

Keywords

Biomaterial Hierarchical structure Mechanical property Nanoindentation size effect Trans-scale mechanics 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Jingru Song
    • 1
  • Cuncai Fan
    • 1
  • Hansong Ma
    • 1
  • Yueguang Wei
    • 1
    Email author
  1. 1.LNM, Institute of MechanicsChinese Academy of SciencesBeijingChina

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