Development, 3D printing, and mechanics of novel auxetic unit cell monostructures
Year: 2024
Type: article
Abstract: Complex structures with unique mechanics are positioned at the cornerstone of translational additive manufacturing for a broad range of applications since conventional fabrication techniques are technologically and economically infeasible. The overarching objective of this research is to develop a novel 3D auxetic monostructure (unit cell) enabled by an additive manufacturing mindset for printability, scalability, and tunability. The approach leverages the vat photopolymerization 3D printing process to fabricate various unit cell structures with distinct geometrical features. The printed structures were experimentally investigated under quasi-static loading conditions using full-field analyses. Additionally, two common auxetic structures (3D re-entrant and star topologies) were mechanistically characterized and used to benchmark the structural response of the proposed design. Notably, the auxetic structures developed herein are only feasible with additive manufacturing technologies while exhibiting independence of the specific process. Supplementary computational models were validated using the experimentally quantified responses and the digital image correlation data, which were in good agreement, bolstering future numerical optimization. The outcomes of the present study demonstrated the superior auxeticity of the newly introduced 3D S-shaped monostructure as a byproduct of its rigid body motion and reduced stress concentration, motivating novel research directions, including 3D stackability for optimized biomedical implants.
Source: Thin-Walled Structures
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,310
Awards: G1911185652, NONDESTRUCTIVE EVALUATION OF ADDITIVELY MANUFACTURED POLYMERS AND COMPOSITES, G3301368582, G3500538987, IN-SITU CHARACTERIZATION OF THE DYNAMIC BEHAVIOR OF IMPACT MITIGATING POLYMERS, Collaborative Research: Investigations of Density-graded Auxetic Foams at Multiple Scales, NEW START REP GRANT ENTITLED, "NONDESTRUCTIVE EVALUATION OF 3D PRINTED COMPOSITES USING TERAHERTZ WAVES", G648718839, DYNAMIC CHARACTERIZATION OF POLYMERS AND POLYMER-BASED COMPOSITES, Collaborative Research: Investigations of Density-graded Auxetic Foams at Multiple Scales
OpenAlex ID: W4405531828