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

Photiou, Demetris; Avraam, Stelios; Sillani, Francesco; Verga, Fabrizio; Jay, Olivier; Papadakis, Loucas

doi:10.3390/app112110362

Cited by 22 publications

(13 citation statements)

References 47 publications

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“…In principle, auxetic structures can be made from all classes of materials, such as polymeric [ 10–12 ] ceramic, [ 13 ] and metallic materials. [ 13,14 ] In the case of metals, shape memory alloys (SMAs) are of particular interest due to the large strains these materials can withstand.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Alloy Thin Film Auxetic Structures

Dengiz

Goldbeck

Curtis

et al. 2023

Adv Materials Technologies

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Auxetic structures provide an interesting approach to solving engineering problems due to their negative Poisson's ratio, which allows for elongation perpendicular to applied stresses, opposite to a conventional structure's necking behavior. Thus, they can function well in applications requiring compacting the device into a small volume during the deployment (e.g., implants inserted with catheters) or stretchability with area coverage (e.g., stretchable electronics). Fabricating them with shape memory alloys (SMAs) expands the possibilities. The high strains experienced by auxetic structures may become reversible compared to ordinary metals due to superelastic or shape memory effect. This work studies four different auxetic microstructures using thin film SMAs that are capable of surviving strains up to 57.4%. Since these structures are fabricated by layer deposition and lithography, other components, such as microelectronics, can be seamlessly integrated into the fabrication process. These auxetic thin films are investigated for their mechanical behavior under tension for their stretchability and stability. Under tension, thin films are known to show wrinkling instabilities. In two of four designs, the large auxetic behavior leads to wrinkling, while the other two display stable, non‐wrinkling behavior. These designs can be candidates for stretchable electronics, wearable medical devices (e.g., biosensors), or implants (e.g., stents).

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Section: Introductionmentioning

confidence: 99%

Shape Memory Alloy Thin Film Auxetic Structures

Dengiz

Goldbeck

Curtis

et al. 2023

Adv Materials Technologies

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“…They reached that, the new designed auxetic structure has good mechanical properties. Demetris P. et al [23] made a quantitative and empirical work about new designed auxetic structure. AM techniques were utilized to generate test specimens.…”

Section: Introductionmentioning

confidence: 99%

Investigation of The Effect of Geometry Inner Thickness on New Designed Auxetic Structure

ERDOĞAN

Toktaş

2023

Politeknik Dergisi

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Poisson’s ratio is important mechanical property of materials and structure. Material and Structure showing negative Poisson’s ratios are called Auxetic. Properties of the Auxetic structures are very important to design the new structure, especially mechanical properties of the Auxetic materials that have structurally and functionally mission. Many researchers made experimental and theoretical works apropos this matter. In this study, the newly designed Auxetic lattice structure Poisson’s ratio was checked over via exploiting finite element analysis. 14 different lattice structures with respect to inner lattice thickness configurations are investigated. All examined structures have a negative Poisson’s ratio. Inner lattice thickness is increased; negative Poisson’s ratio values are decreased (closes to -1.) in these examined lattice structures. 4x2 lattice orientation has lowest Poisson’s ratio than 4x4 Lattice structure Poisson’s ratio, 4x2 is more Auxetic. 4.9 mm inner lattice thickness and 4x2 lattice matrix examined example has lowest Poisson’s ratio that is -0,55. Beneficial to indicate the purview of the structure on the applied force, the stiffness values and the stiffness/mass values were examined. Their energy dissipation capabilities were analyzed.

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“…3D printing makes it possible to manufacture novel and complex structures in a reasonable amount of time compared to conventional manufacturing processes. It provides opportunities for precise, cost-effective, and time-saving manufacturing of auxetic structures with a wide range of materials, [20][21][22] primarily polymers, due to ease of 3D printing, cost-effectiveness, lightness, and flexibility. Auxetic structures are usually achieved by designing specific structures consisting of periodically arranged auxetic unit cells.…”

Section: Introductionmentioning

confidence: 99%

3D‐Printed Soft and Hard Meta‐Structures with Supreme Energy Absorption and Dissipation Capacities in Cyclic Loading Conditions

et al. 2022

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The main objective of this article is to introduce novel 3D bio‐inspired auxetic meta‐structures printed with soft/hard polymers for energy absorption/dissipation applications under single and cyclic loading–unloading. Meta‐structures are developed based on understanding the hyper‐elastic feature of thermoplastic polyurethane (TPU) polymers, elastoplastic behavior of polyamide 12 (PA 12), and snowflake inspired design, derived from theory and experiments. The 3D meta‐structures are fabricated by multi‐jet fusion 3D printing technology. The feasibility and mechanical performance of different meta‐structures are assessed experimentally and numerically. Computational finite element models (FEMs) for the meta‐structures are developed and verified by the experiments. Mechanical compression tests on TPU auxetics show unique features like large recoverable deformations, stress softening, mechanical hysteresis characterized by non‐coincident compressive loading–unloading curve, Mullins effect, cyclic stress softening, and high energy absorption/dissipation capacity. Mechanical testing on PA 12 meta‐structures also reveals their elastoplastic behavior with residual strains and high energy absorption/dissipation performance. It is shown that the developed FEMs can replicate the main features observed in the experiments with a high accuracy. The material‐structural model, conceptual design, and results are expected to be instrumental in 3D printing tunable soft and hard meta‐devices with high energy absorption/dissipation features for applications like lightweight drones and unmanned aerial vehicles (UAVs).

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

Cited by 22 publications

References 47 publications

Shape Memory Alloy Thin Film Auxetic Structures

Shape Memory Alloy Thin Film Auxetic Structures

Investigation of The Effect of Geometry Inner Thickness on New Designed Auxetic Structure

3D‐Printed Soft and Hard Meta‐Structures with Supreme Energy Absorption and Dissipation Capacities in Cyclic Loading Conditions

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