Effect of textile pre-stretch and printed geometry on the curvature of PLA-Lycra 4D textiles DOI Creative Commons
Stefano Pandini, Chiara Pasini, Davide Battini

и другие.

Smart Materials and Structures, Год журнала: 2024, Номер 33(10), С. 105023 - 105023

Опубликована: Сен. 6, 2024

Abstract 4D textiles are a specific class of printed materials obtained by printing flat patterns on elastically pre-tensioned and being able to switch from planar systems complex 3D objects after the textile pre-stretch is released. The mechanical balance between recovering strain structure stiffness determines final shape. This study carried out coupling pre-stretched Lycra PLA explores ways control shape transformations varying (10% ÷ 60%), geometry (bar-shaped star-shaped elements; patterns), element thickness (0.3 3 mm) mutual distance (2 15 mm). By adjusting these parameters, wide set out-of-plane curvatures obtained, ranging flat, dome-like highly curved, wrapped or coiled shapes. Digital optical methods, including digital image analysis, scanning, correlation, used evaluate complexity state evolution during transformation. variation measured in terms height increase (maximum 45 mm for system, 30 multiple star pattern) area decrease 80% 60% pattern). While most occur immediately (‘direct printing’), further evolutions may be triggered heating above glass transition, allowing creation dynamic structures whose changes upon external stimuli. adhesion stretched also examined, with focus determining role interfacial strength conditions that could enhance it. provides an overview primary design variables valuable maps their impacts this broad scenario influencing parameters.

Язык: Английский

4D Printed Shape Memory Polyimide Composite Aerogels with High Recovery Stress for Load Driving DOI
Miaomiao Geng, Tuo Liu,

Xu Zhang

и другие.

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер 17(9), С. 14615 - 14622

Опубликована: Фев. 19, 2025

Shape memory polyimide aerogels with lightweight, high-temperature resistance, and excellent shape performance are ideal materials for intelligent structural components of aerospace. However, their low recovery stress has been a significant barrier to practical use, particularly in driving deformations. Herein, we have prepared 4D printed polyimide/polyimide nanofiber (PI/PIF) composite aerogel high load at temperatures. The PIF enhances ink printability mechanical properties, allowing the design PI/PIF double-curve macrostructures by 3D printing technology. During programming process, can absorb elastic strain energy enhance stress. Consequently, exhibit density (0.09 g cm-3) specific (2.8 N mm kg-1) drive deformation 10 times own weight. proposed is expected expand application lightweight

Язык: Английский

Процитировано

0
Machine learning based on finite element method to predict engineering constants of weft plain knitted composites DOI Creative Commons

Haipeng Ren,

Jiale Liu, Y. Liu

и другие.

Composite Structures, Год журнала: 2025, Номер unknown, С. 119194 - 119194

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Multi‐stimuli responsive behaviors of shape memory woven composites using carbon fiber/Fe3O4/polyurethane composite filaments DOI
Yin Yin, Miao Yu, Bohong Gu

и другие.

Polymer Composites, Год журнала: 2025, Номер unknown

Опубликована: Апрель 17, 2025

Abstract Multi‐stimuli responsive shape memory composites (MS‐SMPCs) have broad potential in fields such as adaptive architecture and aerospace applications but face limitations response speed, mechanical performance, reliability. To address this, this study designs a two‐dimensional woven SMPC based on continuous carbon fiber (CCF)/Fe 3 O 4 nanoparticles/shape polyurethane (SMPU) composite filaments investigates its properties under thermal, electrical, magnetic stimuli. The results demonstrate that the exhibits excellent effects all three uniform distribution of particles enhances SMPC's recovery performance. As content increases from 3% to 9%, time decreases 37.5 9 s. CCF improves strength, electrical conductivity, performance volume fraction 12.7% 29.5%, modulus single‐layer sample by seven times. highest efficiency (SRE) is 0.63 stimulation, followed 0.57 stimulation 0.37 thermal stimulation. adaptability maintain efficient various environments has significant practical value, particularly smart textiles flexible robotics. Highlights Woven with thermal–electrical–magnetic stimuli prepared. Magnetic are uniformly distributed SMPC. improve strength behavior

Язык: Английский

Процитировано

0
Lightweight fluorinated block copolyimide aerogels for high-temperature shape memory DOI

Dingzheng Zhou,

Tiantian Xue,

Zhipeng Fu

и другие.

Polymer, Год журнала: 2025, Номер unknown, С. 128430 - 128430

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Enhanced shape memory performance and numerical simulation of knitted‐fabric reinforced polymer composites with weft yarns DOI
Ying Huang, Wei Zhao,

Haipeng Ren

и другие.

Polymer Composites, Год журнала: 2024, Номер 45(18), С. 16916 - 16928

Опубликована: Авг. 20, 2024

Abstract Fabric‐reinforced shape memory polymeric composites (SMPC) have shown great potential in the design of intelligent deformation structures. In this work, weft‐knitted fabric inserted with weft yarns was developed as reinforcement to fabricate epoxy polymer (SMEP) composites. The effects yarn, loop density and direction on performance SMPC under different bending radii were experimentally investigated. results show that good fixity ratios recovery around 98%. As compared those SMPCs without inserting yarns, shorter time, force 0° 90° directions shows an increase 86.4% 79.5%, respectively. improve 3.7 times SMEP. multiscale models established basis micro‐computed tomography scanning specimens viscoelastic theory. surface buckling behaviors SMEP after U‐bending load discussed. Finally, loops analyzed reveal mechanism. Highlights Shape has time. Recovery obvious enhanced. Multi‐scale established. Surface revealed.

Язык: Английский

Процитировано

1
Effect of textile pre-stretch and printed geometry on the curvature of PLA-Lycra 4D textiles DOI Creative Commons
Stefano Pandini, Chiara Pasini, Davide Battini

и другие.

Smart Materials and Structures, Год журнала: 2024, Номер 33(10), С. 105023 - 105023

Опубликована: Сен. 6, 2024

Abstract 4D textiles are a specific class of printed materials obtained by printing flat patterns on elastically pre-tensioned and being able to switch from planar systems complex 3D objects after the textile pre-stretch is released. The mechanical balance between recovering strain structure stiffness determines final shape. This study carried out coupling pre-stretched Lycra PLA explores ways control shape transformations varying (10% ÷ 60%), geometry (bar-shaped star-shaped elements; patterns), element thickness (0.3 3 mm) mutual distance (2 15 mm). By adjusting these parameters, wide set out-of-plane curvatures obtained, ranging flat, dome-like highly curved, wrapped or coiled shapes. Digital optical methods, including digital image analysis, scanning, correlation, used evaluate complexity state evolution during transformation. variation measured in terms height increase (maximum 45 mm for system, 30 multiple star pattern) area decrease 80% 60% pattern). While most occur immediately (‘direct printing’), further evolutions may be triggered heating above glass transition, allowing creation dynamic structures whose changes upon external stimuli. adhesion stretched also examined, with focus determining role interfacial strength conditions that could enhance it. provides an overview primary design variables valuable maps their impacts this broad scenario influencing parameters.

Язык: Английский

Процитировано

0