Biomimetic bi-material designs for additive manufacturing.

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.