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Statistical physics models for nacre fracture simulation.

Phani Kumar V V Nukala1, Srdan Simunović

  • 1Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
PubMed
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Nacre, or mother-of-pearl, achieves remarkable toughness through its unique brick-and-mortar structure. This study models nacre

Area of Science:

  • Materials Science
  • Biomimetics
  • Mechanics of Materials

Background:

  • Natural materials like nacre exhibit exceptional fracture strength and toughness.
  • Nacre's work of fracture significantly surpasses that of its brittle mineral components.

Purpose of the Study:

  • To investigate the fracture properties of nacre using a discrete lattice model.
  • To understand the microstructural contributions to nacre's mechanical performance.

Main Methods:

  • A discrete lattice model based on nacre's brick and mortar microarchitecture was employed.
  • The model incorporated continuous damage random thresholds fuse network.
  • Mechanical behavior was governed by the modular damage evolution of the organic matrix and mineral bridges.

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Main Results:

  • Nacre's superior fracture properties stem from its microarchitecture, protein unfolding (modular damage evolution), and mineral bridges.
  • The discrete lattice model accurately reproduced experimental results for stiffness, tensile strength, and work of fracture.

Conclusions:

  • The study validates the discrete lattice model for simulating nacre's mechanical behavior.
  • Nacre's remarkable toughness is a direct consequence of its hierarchical structure and material properties.