Mechanical properties of nacre constituents: An inverse method approach

Francois Barthelat*, Horacio D. Espinosa

*Corresponding author for this work

Research output: Contribution to journalConference article

7 Scopus citations

Abstract

Nacre, also known as mother-of-pearl, is the iridescent layer found inside some mollusk species such as oyster or abalone. It is made of relatively weak materials, but its hierarchical microstructure is so well optimized that its macroscopic mechanical properties are far superior to those of its constituents. For this reason there is a great interest in nacre as a source of inspiration for novel designs of composites. Despite many years of research on nacre, an accurate characterization of its constituents is lacking. In this work nacre was tested as a layered composite material using low depth indentation and uniaxial compression. The first test was modeled using finite element analysis and the second test was modeled as a Reuss composite in compression. A micromechanical model of the interface was also pursued to gain insight on the relevance of the interface features such as tablet roughness and biopolymer hydrated response. The results of the two experiments were combined to solve an inverse problem that yielded the needed properties for tablets and interfaces. These findings are expected to make possible computational models of nacre with a new degree of accuracy and therefore contribute to a better understanding of the mechanisms leading to its remarkable properties.

Original languageEnglish (US)
Article numberY7.5
Pages (from-to)67-78
Number of pages12
JournalMaterials Research Society Symposium Proceedings
Volume844
StatePublished - Jun 20 2005
EventMechanical Properties of Bioinspired and Biological Materials - Boston, MA, United States
Duration: Nov 29 2004Dec 2 2004

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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