Exploring geometric morphology in shape memory textiles: design of dynamic light filters

Cabral, Isabel; Souto, A. Pedro; Carvalho, Hélder; Cunha, Joana

doi:10.1177/0040517515578328

Cited by 14 publications

(9 citation statements)

References 15 publications

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“…This enables complex faceted or curved geometries from folding a single flat orthogonal textile sheet. Some examples include Cabral et al's dynamic light filters [16] and Knittel et al's self-folding knitted textiles [17].…”

Section: Programming Geometric Transformationsmentioning

confidence: 99%

Geometric control of thermoformable knitted textiles using raster images

Tan

Quek

Chia

et al. 2023

Smart Mater. Struct.

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CNC knitting technology offers great potential in the creation of thermoformable textiles that can be shaped and stiffened in response to heat. Our research explores how CNC knitting can be used to design and fabricate textiles with precisely allocated material and microstructure layouts. These layouts pre-program specific deformation mechanism(s) into the textile that bias it to form an intended geometry, forgoing the need for a mould during the thermoforming process. We fabricate these smart textiles by knitting two thermal-reactive yarns with different extents of shrinkage, in a double layered structure akin to a bilayer strip. We develop a computational design-to-fabrication pipeline that translates raster images into machine-knittable instructions. Referencing multi-material additive manufacturing principles and self-actuating textiles, this paper proposes several design strategies of dithered gradients, tessellated patches and origami creases, to convert input pixel data into a material distribution layout. When paired with our assisted thermoforming process, this layout induces specific deformations of the textile, such as uni-/multi-axial curling, periodic buckling and sharp folding. Our prototypes implement these strategies on the micro-, meso- and macroscale, leading to the design and fabrication of an architectural cladding panel (700 x 535 x 110 mm) and a patterned clutch bag (200 x 420 x 65 mm).

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Section: Programming Geometric Transformationsmentioning

confidence: 99%

Geometric control of thermoformable knitted textiles using raster images

Tan

Quek

Chia

et al. 2023

Smart Mater. Struct.

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show abstract

“…Similarly, Huang et al suggested an integrated SMA wire into woven fabrics used as sleeves to shorten them upon heating up and elongating again when the environment becomes cooler [56], while SMA wires were integrated into knitted fabrics to enable new design aesthetics [57]. Special Origami techniques were used by Cabral et al to design dynamic light filters, based on SMA wires integrated in woven fabrics [58], and Liu et al applied Miuraorigami designs to prepare samples for compressive loading [59].…”

Section: Shape Memory Textiles With Integrated Shape Memory Alloy Wiresmentioning

confidence: 99%

Shape memory textiles – technological background and possible applications

Ehrmann¹,

Ehrmann

2021

cdatp

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While shape memory alloys (SMAs) and shape memory polymers (SMPs) can already be found in diverse applications, shape memory textiles are less often used. Nevertheless, they are regularly investigated. Typical ways to produce shape memory textiles (SMTs) are introducing shape memory wires, printing shape memory polymers on them (“4D printing”), or using textile materials such as poly(lactic acid) (PLA) which show shape memory properties on their own. This review gives a brief overview of these technological possibilities and possible applications of shape memory textiles.

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“…[48] This property has allowed to develop t-shirts that do not need ironing, [49] clothes that can help to maintain the body temperature, [50] peristaltic devices, [51] or dynamic light filters. [52] SMAs also present behavior called superelasticity or pseudoelasticity. This property is observed when, without any temperature change, the alloy can return to its original shape after a mechanical strain has been applied and then is withdrawn.…”

Section: Order Changementioning

confidence: 99%

Actuating Textiles: Next Generation of Smart Textiles

Persson

Martínez

Zhong

et al. 2018

Adv Materials Technologies

124

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geotextiles, airbags, safety belts, reinforcements for composites, many types of medical implants, etc.). A paradigm has for long been that among technical artefacts [4] textiles are passive (no need for power to perform its function), which could be compared with items from other technical spheres such as computers, radios, or cars, that are regarded as active, i.e., needing power, electrical, or otherwise, to perform their function. The dichotomy passiveactive is often used in electronics [5,6] and control theory to classify components. Passive components [7] (conductors, chassis, resistors, etc.) are those that are not intended to impact any signal or energy transferred through it, whereas active ones (batteries, fans, storage device, transistors, diodes, integrated circuits, etc.) are there exactly for doing this. The smart textile community is at a meeting point between textiles and electronics and the distinction of active and passive as used in electronics is mixed with a general common-language one, where active means "doing something." Any mechanical impact on the surrounding, such as moving a mass spatially, is deemed to exert work, i.e., utilize energy. In this text we stipulate as active such artefacts that are able to move any masses, either of the artefact itself or outside of it. As more and more instances accumulate showing that also textile artefacts could be given this property, also textiles are entering into the domain of being regarded as active. In retrospect, there are some early examples of what today could be defined as active textiles. One such example is the Ventile fabric [8] from the 1940s that was used as a waterproof protecting layer. This fabric operated by the swelling ability of cotton yarn hindering water to penetrate beyond the amount used for the very swelling. However, it was not until the 1980s that textiles-especially garments-were "discovered" as a potential arena for enrichment by other kinds of technologies such as sensorics for measuring the wearer as well as monitoring the surrounding. These have interchangeably been denoted as smart textiles, [9] intelligent textiles, [10] or electronic textiles. [11] This "(re)discovery" of textiles as an interesting field for new technical developments is in parallel with the "(re)discovery" of paper, which, although started later moved at a faster pace and printed electronics, [12] paper electronics, [13] or smart papers [14] now have emerged as branches on their own. Both textiles and papers are polymeric, fiber-based, cheap, pliable, flexible, large area (semi) 2D materials that take part in everyday activities of humans and by this being ubiquitous ever present. Textiles and papers have their respective benefits; textiles for Smart textiles have been around for some decades. Even if interactivity is central to most definitions, the emphasis so far has been on the stimuli/ input side, comparatively little has been reported on the responsive/output part. This study discusses the actuating, mechanical, output side in what could be ...

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Exploring geometric morphology in shape memory textiles: design of dynamic light filters

Cited by 14 publications

References 15 publications

Geometric control of thermoformable knitted textiles using raster images

Geometric control of thermoformable knitted textiles using raster images

Shape memory textiles – technological background and possible applications

Actuating Textiles: Next Generation of Smart Textiles

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