Work

Fracture toughness and auxeticity in disordered metamaterials

Year: 2025

Type: article

Abstract: Auxetic metamaterials are commonly thought to exhibit favorable mechanical properties, notably high energy absorption. Here we investigate disordered metamaterials obtained from random beam networks by optimizing simultaneously auxeticity and the energy absorbed before fracture. By giving different weights to these optimization targets, we demonstrate that the optimal configurations are connected along a Pareto front where high auxeticity implies comparatively low energy absorption and vice versa. We study the mechanical properties of the resulting metamaterials and characterize the different deformation modes obtained for distinct optimization targets. The simulation and optimization results are validated by comparison with the deformation behavior of additively manufactured samples. Our work provides an illustration of the potentials and limitations of multi-objective optimization in the design of disordered mechanical metamaterials.

Source: Physical Review Applied

DOI: 10.1103/r66g-hyxx

Authors: Hannes Holey, Andrea Lorenzo Henri Sergio Detry, Silvia Bonfanti, Roberto Guerra, Anshul D.S. Parmar, Jacopo Fiocchi, Ausonio Tuissi, Michael Zaiser, Stefano Zapperi

Institutions: University of Milan, National Centre for Nuclear Research, Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, Friedrich-Alexander-Universität Erlangen-Nürnberg

Language: English

Topic: Cellular and Composite Structures

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Funders: Alexander von Humboldt-Stiftung, European Commission, Deutsche Forschungsgemeinschaft, Fundacja na rzecz Nauki Polskiej, Narodowym Centrum Nauki, Horizon 2020 Framework Programme, HORIZON EUROPE Framework Programme, European Regional Development Fund, HORIZON EUROPE European Innovation Council, European Innovation Council and Small and Medium-sized Enterprises Executive Agency

Awards: G1473152467, G174444533, Digital design and robotic fabrication of biofoams for adaptive mono-material architecture, G2159277593, G3033941738, G3822402967, G384101947, G434337789, G442103306, G4990747346, G5699177366, G629666837, G6987925164, Centre of Excellence in Multifunctional Materials for Industrial and Medical Applications, G972786147

OpenAlex ID: W4417212338

FWCI: 1.483

Cites: 29

Cited by: 5

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