Reprogrammable Mechanical Metamaterials via Passive and Active Magnetic Interactions

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Mechanical metamaterials offer unique properties not found in natural materials.
• Controlling the mechanical response of metamaterials is crucial for advanced applications.
• Permanent magnets can introduce tunable magnetic interactions within structures.

Purpose of the Study:

• To experimentally demonstrate and investigate the reprogrammability of a rotating-squares mechanical metamaterial.
• To systematically analyze the influence of magnet properties (orientation, magnetization, stiffness) on the metamaterial's static and dynamic responses.
• To explore methods for enhancing reprogrammability, including complex magnetic configurations and external magnetic fields.

Main Methods:

• Fabrication of a rotating-squares mechanical metamaterial with an embedded array of permanent magnets.
• Experimental investigation of static and dynamic mechanical responses under varying magnet orientations and configurations.
• Systematic analysis of the effects of magnet residual magnetization and stiffness.
• Exploration of external magnetic field modulation on metamaterial behavior.

Main Results:

• Demonstrated significant tunability of the metamaterial's mechanical response by adjusting magnet orientation.
• Showcased that complex magnetic node configurations can decouple quasi-static and impact-loading responses.
• Confirmed that external magnetic fields can further enhance the reprogrammability of the metamaterial.
• Identified key parameters for controlling static and dynamic mechanical behaviors.

Conclusions:

• Mechanical metamaterials with embedded magnets are reprogrammable, offering adaptable structural properties.
• Magnet orientation and external fields are effective tools for tuning mechanical responses.
• This research enables the development of engineered structural components with on-demand, adaptable mechanical functions.