Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression

Auxetic structures possess a negative Poisson ratio (ν < 0) as a result of their geometrical configuration, which exhibits enhanced indentation resistance, fracture toughness, and impact resistance, as well as exceptional mechanical response advantages for applications in defense, biomedical, aut...

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Autores principales:	Demetris Photiou, Stelios Avraam, Francesco Sillani, Fabrizio Verga, Olivier Jay, Loucas Papadakis
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	auxetic structures additive manufacturing SLS FDM quasi-static compression testing FEA Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/2e050182ff02444c865fe6bffc5e4c67
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spelling	oai:doaj.org-article:2e050182ff02444c865fe6bffc5e4c672021-11-11T15:23:45ZExperimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression10.3390/app1121103622076-3417https://doaj.org/article/2e050182ff02444c865fe6bffc5e4c672021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10362https://doaj.org/toc/2076-3417Auxetic structures possess a negative Poisson ratio (ν < 0) as a result of their geometrical configuration, which exhibits enhanced indentation resistance, fracture toughness, and impact resistance, as well as exceptional mechanical response advantages for applications in defense, biomedical, automotive, aerospace, sports, consumer goods, and personal protective equipment sectors. With the advent of additive manufacturing, it has become possible to produce complex shapes with auxetic properties, which could not have been possible with traditional manufacturing. Three-dimensional printing enables easy and precise control of the geometry and material composition of the creation of desirable shapes, providing the opportunity to explore different geometric aspects of auxetic structures with a variety of different materials. This study investigated the geometrical and material combinations that can be jointly tailored to optimize the auxetic effects of 2D and 3D complex structures by integrating design, modelling approaches, 3D printing, and mechanical testing. The simulation-driven design methodology allowed for the identification and creation of optimum auxetic prototype samples manufactured by 3D printing with different polymer materials. Compression tests were performed to characterize the auxetic behavior of the different system configurations. The experimental investigation demonstrated a Poisson’s ration reaching a value of ν = −0.6 for certain shape and material combinations, thus providing support for preliminary finite element studies on unit cells. Finally, based on the experimental tests, 3D finite element models with elastic material formulations were generated to replicate the mechanical performance of the auxetic structures by means of simulations. The findings showed a coherent deformation behavior with experimental measurements and image analysis.Demetris PhotiouStelios AvraamFrancesco SillaniFabrizio VergaOlivier JayLoucas PapadakisMDPI AGarticleauxetic structuresadditive manufacturingSLSFDMquasi-static compression testingFEATechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10362, p 10362 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	auxetic structures additive manufacturing SLS FDM quasi-static compression testing FEA Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	auxetic structures additive manufacturing SLS FDM quasi-static compression testing FEA Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Demetris Photiou Stelios Avraam Francesco Sillani Fabrizio Verga Olivier Jay Loucas Papadakis Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression
description	Auxetic structures possess a negative Poisson ratio (ν < 0) as a result of their geometrical configuration, which exhibits enhanced indentation resistance, fracture toughness, and impact resistance, as well as exceptional mechanical response advantages for applications in defense, biomedical, automotive, aerospace, sports, consumer goods, and personal protective equipment sectors. With the advent of additive manufacturing, it has become possible to produce complex shapes with auxetic properties, which could not have been possible with traditional manufacturing. Three-dimensional printing enables easy and precise control of the geometry and material composition of the creation of desirable shapes, providing the opportunity to explore different geometric aspects of auxetic structures with a variety of different materials. This study investigated the geometrical and material combinations that can be jointly tailored to optimize the auxetic effects of 2D and 3D complex structures by integrating design, modelling approaches, 3D printing, and mechanical testing. The simulation-driven design methodology allowed for the identification and creation of optimum auxetic prototype samples manufactured by 3D printing with different polymer materials. Compression tests were performed to characterize the auxetic behavior of the different system configurations. The experimental investigation demonstrated a Poisson’s ration reaching a value of ν = −0.6 for certain shape and material combinations, thus providing support for preliminary finite element studies on unit cells. Finally, based on the experimental tests, 3D finite element models with elastic material formulations were generated to replicate the mechanical performance of the auxetic structures by means of simulations. The findings showed a coherent deformation behavior with experimental measurements and image analysis.
format	article
author	Demetris Photiou Stelios Avraam Francesco Sillani Fabrizio Verga Olivier Jay Loucas Papadakis
author_facet	Demetris Photiou Stelios Avraam Francesco Sillani Fabrizio Verga Olivier Jay Loucas Papadakis
author_sort	Demetris Photiou
title	Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression
title_short	Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression
title_full	Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression
title_fullStr	Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression
title_full_unstemmed	Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression
title_sort	experimental and numerical analysis of 3d printed polymer tetra-petal auxetic structures under compression
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2e050182ff02444c865fe6bffc5e4c67
work_keys_str_mv	AT demetrisphotiou experimentalandnumericalanalysisof3dprintedpolymertetrapetalauxeticstructuresundercompression AT steliosavraam experimentalandnumericalanalysisof3dprintedpolymertetrapetalauxeticstructuresundercompression AT francescosillani experimentalandnumericalanalysisof3dprintedpolymertetrapetalauxeticstructuresundercompression AT fabrizioverga experimentalandnumericalanalysisof3dprintedpolymertetrapetalauxeticstructuresundercompression AT olivierjay experimentalandnumericalanalysisof3dprintedpolymertetrapetalauxeticstructuresundercompression AT loucaspapadakis experimentalandnumericalanalysisof3dprintedpolymertetrapetalauxeticstructuresundercompression
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Experimental and Numerical Analysis of 3D Printed Polymer Tetra-Petal Auxetic Structures under Compression

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