Buckling versus unilateral constraint for a multistable metamaterial element.

Area of Science:

• Materials Science
• Mechanical Engineering
• Physics

Background:

• Metamaterials offer unique mechanical properties through engineered structures.
• Multistability in materials allows for multiple stable states, useful in tunable devices.
• Understanding structural buckling is key to designing advanced materials.

Purpose of the Study:

• To design and investigate a structural element for elastic multistable metamaterials.
• To explore the implications of buckling at null load on material dynamics.
• To characterize the nonlinear quasi-static response and multistable nature of the designed structure.

Main Methods:

• Design of a strut with bifurcation at vanishing tensile or compressive load.
• Analysis of buckling at null load to establish mechanical equivalence with unilateral constraints.
• Investigation of nonlinear quasi-static response to determine multistability.

Main Results:

• The designed structural element enables the development of elastic multistable metamaterials.
• Buckling at null load introduces dynamics akin to unilateral constraints, with potential for shocks.
• The structure exhibits multistable behavior, specifically bistable or tetrastable configurations.

Conclusions:

• The novel structural element is a foundational component for creating advanced elastic multistable metamaterials.
• The unique buckling behavior at null load opens avenues for studying shock dynamics in engineered materials.
• The demonstrated bistable and tetrastable characteristics highlight the potential for tunable mechanical responses.