Bending techniques for flat materials using cut patterns: a review

Lorenzoni, Barbara Ruschel; Silva, Fábio Pinto da

doi:10.30574/gjeta.2021.7.2.0070

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…Most of the works regarding kerfing stiffer materials stem from recent years and [LS21] provide a review of many different bending techniques, including kerf cuts. One of the first applicants of two dimensional kerf patterns, which provide smaller but bidirectional flexibility, were [Iva15], who use interlocking spirals.…”

Section: Related Workmentioning

confidence: 99%

Freeform Shape Fabrication by Kerfing Stiff Materials

Speetzen,

Kobbelt

2024

Computer Graphics Forum

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Fast, flexible, and cost efficient production of 3D models from 2D material sheets is a key component in digital fabrication and prototyping. In order to achieve high quality approximations of freeform shapes, a common set of methods aim to produce bendable 2D cutouts that are then assembled. So far bent surfaces are achieved automatically by computing developable patches of the input surface, e.g. in the context of papercraft. For stiff materials such as medium‐density fibreboard (MDF) or plywood, the 2D cutouts require the application of additional cutting patterns (“kerfing”) to make them bendable. Such kerf patterns are commonly constructed with considerable user input, e.g. in architectural design. We propose a fully automatic method that produces kerfed cutouts suitable for the assembly of freeform shapes from stiff material sheets. By exploring the degrees of freedom emerging from the choice of bending directions, the creation of box joints at the patch boundaries as well as the application of kerf cuts with adaptive density, our method is able to achieve a high quality approximation of the input.

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Section: Related Workmentioning

confidence: 99%

Freeform Shape Fabrication by Kerfing Stiff Materials

Speetzen,

Kobbelt

2024

Computer Graphics Forum

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“…Two groups of mechanical metamaterials can be distinguished, namely auxetic metamaterials (with a negative Poisson's ratio-NPR) and non-auxetic metamaterials (with a positive Poisson's ratio) [1]. Both of these groups have a significant potential for application, which, though not without difficulty, is becoming commercialized, e.g., their multifunctional applications in energy storage, biomedicine, acoustics, photonics and thermal management, architecture, mechanical engineering [2,3] and mechatronics-in sensors and actuators [4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Modified Auxetic Structures from Rigid Rotating Squares

2022

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Auxetic structures exhibit unusual changes in size, expanding laterally upon stretching instead of contracting. This paper presents this effect in a failsafe mode in structures made of rigid squares. We applied the concept of auxetic structures made of rigid rotating squares (from Grima and Evans) and offer a novel solution for connecting them. By introducing axes of rotation on the surface of the squares, a reliable working system is obtained, free from stress, in which the squares can come into contact with each other and completely cover the surface of the structure, or, in the open position, form regularly arranged pores. Herein, we present a new 2D auxetic metamaterial that is mathematically generated based on a theoretical relationship of the angle between the edges of a square and the position of the axis of rotation. Physical models were generated in the form of a planar structure and in the form of a circular closed structure. Such physical models confirmed our initial considerations and the geometrical relationships, offering new application possibilities. The novel structure that was designed and manufactured for the purpose of the paper can be considered as a new proposal in the market of auxetic materials.

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Curved surface form-finding with self-shaping perforated plates

Bahremandi-Tolou,

Wang,

Gattas

et al. 2024

ARIN

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Self-shaping systems offer a promising approach for making complex 3D geometries from the material-driven transformation of 2D sheets. However, current research development of such systems is focused on small-scale applications. This study proposes a self-shaping composite for generation of larger-scale curved surfaces suitable for spatial structures. The composite arises from the novel combination of a perforated plate passive layer and a heat-shrinkable active layer. Experimental investigations are undertaken to assess the influence of perforation parameters of the passive layer over the degree of curvature generated in the self-shaping composite system. A 3D scanner and parametric curvature evaluation tool were used to extract and analyse the fabricated surface curvatures. Three key deformation characteristics were identified: the generated surface is cylindrical with dominant curvature in the x-direction; curvature is approximately uniform across the surface width and length; and curvature is strongly influenced by perforation bridge and strap length parameters. Results of this study support the application of self-shaping curved surfaces for customizable discrete structure parts.

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Bending techniques for flat materials using cut patterns: a review

Cited by 4 publications

References 41 publications

Freeform Shape Fabrication by Kerfing Stiff Materials

Freeform Shape Fabrication by Kerfing Stiff Materials

Investigation of Modified Auxetic Structures from Rigid Rotating Squares

Curved surface form-finding with self-shaping perforated plates

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