Interlocking metasurfaces

Bolmin, Ophelia; Young, Benjamin; Leathe, Nicholas; Noell, Philip; Boyce, Brad Lee

doi:10.1007/s10853-022-08015-9

Cited by 11 publications

(3 citation statements)

References 39 publications

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“…Here, naturally, non-occurring structured surface pairs are designed that can be temporarily connected or permanently joined to open up new mounting possibilities between surfaces. These pairs can be constructed with similarly shaped (androgynous) or with topologically different features (e.g., tongue and groove) [24]. Properties of parts manufactured using FFF may differ from objects fabricated through alternative processes, such as injection molding [18,19,25].…”

Section: Introductionmentioning

confidence: 99%

Extrusion-Based Additive Manufacturing-Driven Design and Testing of the Snapping Interlocking Metasurface Mechanism ShroomLock

Gloyer,

Schek,

Flöttmann

et al. 2023

Inventions

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This study presents the manufacturing process-driven development of an interlocking metasurface; (ILM) mechanism for fused filament fabrication; (FFF) with a focus on open-source accessibility. The presented ILM is designed to enable strong contact between two planar surfaces. The mechanism consists of spring elements and locking pins which snap together when forced into contact. The mechanism is designed to deliver optimized mechanical properties, functionality, and printability with common FFF printers. The mechanism is printed from a thermoplastic polyurethane; (TPU) filament which was selected for its flexibility, which is necessary for the proper functioning of the spring elements. To characterize the designed mechanism, a tensile test is carried out to assess the holding force of the ILM. The force-displacement profiles are analyzed and categorized into distinct phases, highlighting the interplay between spring deformation, sliding, and disengagement. Finally, from the measurements of multiple printed specimens, a representative holding force is determined through averaging and assigned to the mechanism. The resulting tolerance, which can be attributed to geometric and material-related factors, is discussed. The testing results are discussed and compared with a numerical simulation carried out with a frictionless approach with a nonlinear Neo-Hookean material law. The study underscores the importance of meticulous parameter control in three-dimensional (3D) printing for the consistent and reliable performance of interlocking metasurface mechanisms. The investigation leads to a scalable model of an ILM element pair with distinct three-phase snapping characteristics ensuring reliable holding capabilities.

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Section: Introductionmentioning

confidence: 99%

Extrusion-Based Additive Manufacturing-Driven Design and Testing of the Snapping Interlocking Metasurface Mechanism ShroomLock

Gloyer,

Schek,

Flöttmann

et al. 2023

Inventions

View full text Add to dashboard Cite

show abstract

“…Here, naturally non-occurring structured surface pairs are designed that can be temporarily connected or permanently joined to open up new mounting possibilities between surfaces. These pairs can be constructed with similarly shaped (androgynous) or with topologically different features (e. g. , tongue and groove) [9]. The properties of parts manufactured by Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s).…”

Section: Introductionmentioning

confidence: 99%

“…ILMs have already been investigated by several research groups. A thorough overview and an introduction into the topic of ILMs may be found in [9]. Furthermore, in [12] experiments and simulations on T-slot sliding mechanisms and their implementation in aerospace technology were conducted.…”

Section: Introductionmentioning

confidence: 99%

Extrusion-Based Additive Manufacturing Driven Design and Testing of the Snapping Interlocking Metasurface Mechanism <em>ShroomLock</em>

Gloyer,

Schek,

Flöttmann

et al. 2023

Preprint

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This study presents the manufacturing process driven development of an interlocking metasurface mechanism (ILM) for Fused Filament Fabrication (FFF) with a focus on open-source accessibility. The presented ILM is designed to enable strong contact between to planar surfaces. The mechanism consists of spring elements and locking pins which snap together when forced into contact. The mechanism is designed to optimize mechanical properties, functionality and printability with common FFF printers. The mechanisms is printed from thermoplastic polyurethane (TPU) filament which was selected for its flexibility, crucial for spring element performance and tolerances of the fabrication method. To characterize the designed mechanism a tensile test is carried out to assess the holding force of the ILM. The force-displacement profiles are analyzed and categorized into distinct phases, highlighting the interplay between spring deformation, sliding, and disengagement. The results show variations in holding forces attributed to geometric and material-related factors. The testing results are compared and discussed to a numerical simulation carried out with a frictionless approach with a nonlinear Neo–Hookean material law. The study underscores the importance of meticulous parameter control in 3D printing for consistent and reliable performance of interlocking metasurface mechanisms. The investigation leads to a scalable model of a ILM element pair with a distinct three-phase snapping characteristics ensuring reliable holding capabilities.

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The Toughness of Interlocking Metasurfaces

Young,

Smith,

Grutzik

et al. 2024

Adv Eng Mater

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Interlocking metasurfaces (ILMs) are arrays of autogenous latching unit cells patterned across a surface. These create structural joints similar to bio‐inspired suture joints but patterned over a 2D surface rather than a 1D seam. This enables ILMs to be an alternative to conventional joining technologies such as bolts, welds, and adhesives. However, compared to conventional joining methods, relatively little is known of the engineering considerations for designing structural ILMs. In this study, the interfacial toughness of an archetypal ILM was examined for the first time. Under the conditions studied here, the ILM was substantially tougher than the material from which it was made; in this case exhibiting up to a 50% increase in interfacial crack initiation energy over the solid base material, a photocured 3D printed polymer. Through experimental tests using in‐situ digital image correlation along with complementary computational analyses, the mechanism of toughening in the ILM structure and the origins of toughness anisotropy were revealed. The increase in toughness is associated with cross‐cell interactions, i.e. load‐sharing across unit cells, which gives rise to a finite process zone length with different effective material properties. In this way, ILM toughening is analogous to crack blunting in ductile materials or fiber bridging in composites; yet here, the ILM was composed of a single‐phase base material and so the architected toughening is geometric in nature and hence amenable to future topological optimization.This article is protected by copyright. All rights reserved.

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Interlocking metasurfaces

Cited by 11 publications

References 39 publications

Extrusion-Based Additive Manufacturing-Driven Design and Testing of the Snapping Interlocking Metasurface Mechanism ShroomLock

Extrusion-Based Additive Manufacturing-Driven Design and Testing of the Snapping Interlocking Metasurface Mechanism ShroomLock

Extrusion-Based Additive Manufacturing Driven Design and Testing of the Snapping Interlocking Metasurface Mechanism <em>ShroomLock</em>

The Toughness of Interlocking Metasurfaces

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