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Programmable Multistable Perforated Shellular.

Jiahao Shi¹, Hossein Mofatteh¹, Armin Mirabolghasemi¹

¹Department of Bioresource Engineering, McGill University, Montreal, QC H9X 3V9, Canada.

Advanced Materials (Deerfield Beach, Fla.)

|September 1, 2021

Summary

This summary is machine-generated.

Researchers developed a novel 3D multistable shellular metamaterial using perforated Schwarz Primitive shells. This design enables multiple stable states for enhanced energy absorption and deployable applications.

Keywords:

P shellular mechanical metamaterials multidirectional multistability programmable properties staggered perforation

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Area of Science:

Materials Science
Mechanical Engineering
Metamaterials

Background:

Bistable metamaterials are crucial for deployable structures and dampers.
Existing designs often rely on inclined or curved struts.

Purpose of the Study:

To develop a new 3D multistable shellular metamaterial.
To integrate multistability with shellular material properties like high surface area and stiffness.

Main Methods:

Introducing delicate perforations on Schwarz's Primitive shellular surface.
Creating multilayer staggered perforations to form hinges and induce local instability.
Extending perforation design in three orthogonal directions for three-directional multistability.

Main Results:

Developed shellular motifs with elliptical perforations exhibiting mechanical bistability.
Achieved up to 2^(n-1) stable states per motif using n-layer staggered perforations.
Demonstrated strong rigidity and enhanced energy dissipation through snap-through/snap-back behaviors.

Conclusions:

The novel design strategy enables the creation of multidirectional multistable shellular metamaterials.
These metamaterials offer load-bearing capabilities for applications in soft robotics, shape-morphing architectures, and energy absorbers/dampers.