Deformation mechanisms in nacre

R. Z. Wang, Z. Suo, A. G. Evans, N. Yao, Ilhan A. Aksay

Research output: Contribution to journalArticle

563 Scopus citations

Abstract

Nacre (mother-of-pearl) from mollusc shells is a biologically formed lamellar ceramic. The inelastic deformation of this material has been experimentally examined, with a focus on understanding the underlying mechanisms. Slip along the lamellae tablet interface has been ascertained by testing in compression with the boundaries oriented at 45° to the loading axis. The steady-state shear resistance Tss has been determined and inelastic strain shown to be as high as 8%. The inelastic deformation was realized by massive interlamellae shearing. Testing in tension parallel to the tablets indicates inelastic strain of about 1%, occurring at a steady-state stress, σss ≈ 110 MPa. The strain was associated with the formation of multiple dilatation bands at the intertablet boundaries accompanied by interlamellae sliding. Nano-asperities on the aragonite tablets and their interposing topology provide the resistance to interfacial sliding and establish the level of the stress needed to attain the inelastic strain. Detailed mechanisms and their significance for the design of robust ceramics are discussed.

Original languageEnglish (US)
Pages (from-to)2485-2493
Number of pages9
JournalJournal of Materials Research
Volume16
Issue number9
DOIs
StatePublished - Sep 2001

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Deformation mechanisms in nacre'. Together they form a unique fingerprint.

  • Cite this

    Wang, R. Z., Suo, Z., Evans, A. G., Yao, N., & Aksay, I. A. (2001). Deformation mechanisms in nacre. Journal of Materials Research, 16(9), 2485-2493. https://doi.org/10.1557/JMR.2001.0340