Decoupling local mechanics from large-scale structure in modular metamaterials

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Mechanical metamaterials derive properties from internal structure, enabling remarkable mechanical behaviors.
• Translating metamaterial design principles to large-scale applications requires engineering complex structures with specific functionalities.
• Inverse design challenges arise from the coupling between global structure and local mechanical performance.

Purpose of the Study:

• To develop a systematic strategy for inverse design of large-scale mechanical metamaterials.
• To enable engineering of structures with prescribed mechanical functionality by overcoming design space limitations.
• To demonstrate a method for creating complex 1D, 2D, and 3D mechanical metamaterials.

Main Methods:

• Introduced a modular design strategy inspired by origami and kirigami principles.
• Assembled modules into voxelized large-scale structures.
• Utilized a design approach where module parameters exceed assembly constraints for independent voxel property assignment.

Main Results:

• Successfully demonstrated the construction of 1D, 2D, and 3D mechanical metamaterials.
• Showcased that decoupling global structure from local mechanical function allows for diverse designs.
• Enabled the creation of mechanically and topologically complex metamaterial structures.

Conclusions:

• The modular origami/kirigami-inspired approach facilitates inverse design of large-scale mechanical metamaterials.
• This strategy overcomes limitations in design space by allowing independent control over local mechanical properties within a global structure.
• The method provides a pathway for realizing practical applications of metamaterials with tailored functionalities.