Trusses beyond trusses: intertwined and straw-based metamaterials and beyond

Area of Science:

• Materials Science and Engineering
• Mechanical Engineering
• Metamaterials Design

Background:

• Periodic beam-based metamaterials are well-studied for tunable mechanical properties and wave dispersion.
• Existing research focuses on lattice topology with simple beam elements.

Purpose of the Study:

• To explore advanced mechanical metamaterials by substituting beams with complex structural members.
• To investigate novel design spaces and performance characteristics.
• To leverage small-scale design mechanisms for enhanced material functionalities.

Main Methods:

• Maintaining established lattice topologies from beam-based metamaterials.
• Replacing simple beams with complex structural members (e.g., straws, intertwined fibers).
• Analyzing the influence of small-scale mechanisms like contact, friction, sliding, multistability, and reconfigurability.

Main Results:

• Demonstrated the feasibility of using complex structural members within periodic metamaterial lattices.
• Identified opportunities for enhanced stiffness, strength, and wave dispersion through novel mechanisms.
• Opened new avenues for material performance exploration beyond traditional beam-based designs.

Conclusions:

• Complex structural members offer a promising route to expand the design space of mechanical metamaterials.
• Leveraging small-scale phenomena like friction and multistability can lead to unprecedented material behaviors.
• This approach provides a foundation for developing next-generation reconfigurable and high-performance metamaterials.