Journal article
Direct Quantification of the Mechanical Anisotropy and Fracture of an Individual Exoskeleton Layer via Uniaxial Compression of Micropillars
Nano letters, v 11(9), pp 3868-3874
01 Sep 2011
PMID: 21755939
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A common feature of the outer layer of protective biological exoskeletons is structural anisotropy. Here, we directly quantify the mechanical anisotropy and fracture of an individual material layer of a hydroxyapatite-based nanocomposite exoskeleton, the outmost ganoine of Polypterus senegalus scale. Uniaxial compression was conducted on cylindrical micropillars of ganoine fabricated via focused ion beam at different orientations relative to the hydroxyapatite rod long axis (theta = 0 degrees, 45 degrees, 90 degrees). Engineering stress versus strain curves revealed significant elastic and plastic anisotropy, off-axial strain hardening, and noncatastrophic crack propagation within ganoine. Off-axial compression (theta = 45 degrees) showed the lowest elastic modulus, E (36.2 +/- 1.6 GPa, n >= 10, mean +/- SEM), and yield stress, sigma(Y) (0.81 +/- 0.02 GPa), while compression at theta = 0 degrees showed the highest E (51.8 +/- 1.7 GPa) and sigma(Y) (1.08 +/- 0.05 GPa). A 3D elastic-plastic composite nanostructural finite element model revealed this anisotropy was correlated to the alignment of the HAP rods and could facilitate energy dissipation and damage localization, thus preventing catastrophic failure upon penetration attacks.
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Details
- Title
- Direct Quantification of the Mechanical Anisotropy and Fracture of an Individual Exoskeleton Layer via Uniaxial Compression of Micropillars
- Creators
- Lin Han - MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USALifeng Wang - Massachusetts Institute of TechnologyJuha Song - Massachusetts Institute of TechnologyMary C. Boyce - Massachusetts Institute of TechnologyChristine Ortiz - Massachusetts Institute of Technology
- Publication Details
- Nano letters, v 11(9), pp 3868-3874
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 7
- Grant note
- DMR-0819762 / National Science Foundation MIT Center for Materials Science and Engineering DAAD-19-02-D0002 / MIT Institute for Soldier Nanotechnologies MIT Nanomechanical Technology Laboratory N00244-09-1-0064 / National Security Science and Engineering Faculty
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000294790200062
- Scopus ID
- 2-s2.0-80052800184
- Other Identifier
- 991019187074604721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied
- Physics, Condensed Matter