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Biomimetic bi-material designs for additive manufacturing.

A Rahimizadeh1, H Yazdani Sarvestani1, J Barroeta Robles1

  • 1Aerospace Manufacturing Technology Center, National Research Council Canada, Montreal, QC H3T 2B2, Canada.

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|April 21, 2022
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Summary

This study introduces biomimetic, nacre-inspired architectured bi-material structures for additive manufacturing (AM). These structures show enhanced toughness up to 25% due to optimized material and architectural features.

Keywords:
additive manufacturingarchitectured designbending performancebi-material structurescomputational modeltoughness

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Area of Science:

  • Materials Science
  • Biomimetics
  • Computational Engineering

Background:

  • Biomimetic designs, inspired by nature, offer superior material properties.
  • Natural nacre's structure provides a model for robust, high-performance materials.

Purpose of the Study:

  • To develop a computational framework for novel architectured bi-material structures using additive manufacturing (AM).
  • To design structures with tunable stiffness, strength, and toughness inspired by nacre.

Main Methods:

  • Computational modeling of multilayered structures mimicking nacre, using hexagonal brittle blocks bonded by soft materials.
  • Quasi-static non-linear explicit analysis for efficient simulation of interlayer interactions.
  • Systematic investigation of structural, material, and AM features influencing mechanical performance.

Main Results:

  • Architectured bi-material beams exhibited up to 25% enhanced toughness compared to monolithic structures.
  • Improved toughness attributed to frictional sliding in brittle phases and shear plastic deformation in soft interfaces.
  • Demonstrated influence of soft-to-hard volume ratio, material properties, and support structures on performance.

Conclusions:

  • The developed computational framework facilitates the additive manufacturing (AM) of nacre-based bi-material structures.
  • Optimized designs enable tailored mechanical performance, balancing stiffness, strength, and toughness.
  • Understanding architectural parameter influence is key for advanced biomimetic material development.