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Standing Waves in a Cavity

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

Enhancing energy absorption through sequential instabilities in mechanical metamaterials.

Adam Bekele¹, M Ahmer Wadee¹, Andrew T M Phillips¹

¹Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UK.

Royal Society Open Science

|August 31, 2023

Summary

This study introduces a novel mechanical metamaterial that uses elastic instability for energy absorption. This design offers high strength followed by low stiffness, enabling reusable and repairable protective components.

Keywords:

finite-element analysis mathematical modelling mechanical metamaterials physical experiments structural instability

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Area of Science:

Mechanical Engineering
Materials Science
Metamaterials

Background:

Energy-absorbing components ideally need high load capacity and near-zero stiffness to minimize stress transfer.
Traditional methods using material damage limit components to single use.
Elastic instability offers a damage-free alternative for achieving desired mechanical properties.

Purpose of the Study:

To investigate a mechanical metamaterial designed for sequential buckling.
To achieve a 'high strength-low stiffness' characteristic for energy absorption.
To explore the potential for repairable and reusable protective components.

Main Methods:

Analytical modeling
Finite-element analysis
Experimental validation

Main Results:

The metamaterial demonstrated sequential buckling behavior.
Tunable stiffnesses (axial and rotational) were achieved through geometric design.
The design successfully exhibited the 'high strength-low stiffness' characteristic within the elastic range.

Conclusions:

Harnessing elastic instability is a feasible approach for designing energy-absorbing components.
The developed metamaterial shows potential for repairable and reusable applications.
Tuning geometric and connection properties allows for controlled mechanical response and delayed damage onset.