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Advanced Characterization of Flexible Auxetic Resin Lattice Structures Produced by Stereolithography

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Abstract:

Lattice metamaterials with adjustable auxetic behavior are characterized by periodic configurations of interconnecting struts and nodes, allowing for precise control over their macroscopic mechanical properties. Different lattice configurations were examined, two-unit cell variants with varying void fractions were assembled into crystalline-inspired designs, specifically simple cubic and body-centered cubic. Using vat photopolymerization, fabrication was carried out using a transparent biomedical elastomeric resin that was chosen for its exceptional ductility and strain tolerance. The curing, crosslinking and thermal mechanical stability of the resin were examined using Fourier Transform Infrared Spectroscopy and Differential Scanning Calorimetry, before and after polymerization. In order to determine specific stiffness, specific yield strength, mechanical characterization involved quasi-static uniaxial compression testing. The effect of different aspects of the macroscopic structures was also observed, exploiting diverse possible applications. The combination of geometry and the behavior of the elastomeric material allowed the creation of lightweight structures that could support large reversible deformations that could be used in soft robotics and healthcare devices.

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Info:

Periodical:

Key Engineering Materials (Volume 1047)

Pages:

53-64

Online since:

April 2026

Authors:

Stefano Belcuore, Stefano Pandini, Elisabetta Ceretti, Abdullah Al Maharbi, Mohammed M. Al-Hinaai, Paola Ginestra*

Keywords:

Flexible Resin, Lattice Structures, Stereolithography

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Permissions:

Creative Commons CC BY 4.0

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* - Corresponding Author

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