What question did this study set out to answer?

To establish the optimal achievable mechanical property ranges and multi-objective design trade-offs of 2D reentrant auxetic lattices using an optimization framework across varying geometric parameters.

September 17, 2026Mechanics of Advanced Materials and StructuresOpen Access

Design of extremal reentrant auxetics using optimization algorithms

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Authors

RHReza Hedayati MAMelikasadat Alavi MSMojtaba Sadighi

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Overview

Experimental and computational study demonstrates extreme negative Poisson's ratios and enhanced energy absorption in 2D reentrant lattices, suggesting pathways for multifunctional metamaterials.

Key Points

To establish the optimal achievable mechanical property ranges and multi-objective design trade-offs of 2D reentrant auxetic lattices using an optimization framework across varying geometric parameters.
Optimized 2D unit-cell geometry (reentrant angle, height, width, strut length, and wall thickness) using gradient-based algorithms (fmincon, Gekko) and a population-based genetic algorithm.
Validated performance boundaries and aspect ratio effects through finite element simulations and quasi-static compression experiments on 3D-printed PLA prototypes.
Wider unit cells with low height-to-width ratios increased longitudinal stiffness but reduced the achievable range of Poisson’s ratios, and vice versa.
Optimized lattice configurations achieved negative Poisson’s ratios down to −35.5 and specific energy-absorption capacities approximately 32 times higher than the base material, with experimental deviations within 10% of theoretical predictions.

Cite This Study

Hedayati et al. (2026) studied this question.

synapsesocial.com/papers/6aabb6d85f706d05830e5936 https://doi.org/10.1080/15376494.2026.2726681

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September 17, 2026Mechanics of Advanced Materials and StructuresOpen Access

Design of extremal reentrant auxetics using optimization algorithms

View Full Paper

Ask AI

Bookmark

Authors

RHReza Hedayati MAMelikasadat Alavi MSMojtaba Sadighi

Discussion

Member takes

Overview

Experimental and computational study demonstrates extreme negative Poisson's ratios and enhanced energy absorption in 2D reentrant lattices, suggesting pathways for multifunctional metamaterials.

Key Points

To establish the optimal achievable mechanical property ranges and multi-objective design trade-offs of 2D reentrant auxetic lattices using an optimization framework across varying geometric parameters.
Optimized 2D unit-cell geometry (reentrant angle, height, width, strut length, and wall thickness) using gradient-based algorithms (fmincon, Gekko) and a population-based genetic algorithm.
Validated performance boundaries and aspect ratio effects through finite element simulations and quasi-static compression experiments on 3D-printed PLA prototypes.
Wider unit cells with low height-to-width ratios increased longitudinal stiffness but reduced the achievable range of Poisson’s ratios, and vice versa.
Optimized lattice configurations achieved negative Poisson’s ratios down to −35.5 and specific energy-absorption capacities approximately 32 times higher than the base material, with experimental deviations within 10% of theoretical predictions.

Cite This Study

Hedayati et al. (2026) studied this question.

synapsesocial.com/papers/6aabb6d85f706d05830e5936 https://doi.org/10.1080/15376494.2026.2726681

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