Review
Instruments & Instrumentation
Matthew Wallbanks, Muhammad Farhan Khan, Mahdi Bodaghi, Andrew Triantaphyllou, Ahmad Serjouei
Summary: Auxetic metamaterials exhibit the unexpected behavior of negative Poisson's ratio, expanding transversely when stretched longitudinally, which has applications in energy absorption, sensors, smart filters, vibration isolation, and medical fields. The potential of these structures can be further explored through additive manufacturing. There is currently a lack of guidance on the design of these structures, and this paper provides insights into the state-of-the-art and design approaches.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Sree Kalyan Patiballa, Girish Krishnan
Summary: This paper presents a two-phase design methodology for the conceptual synthesis of three-dimensional tunable mechanical metamaterials. The first phase involves obtaining a kinematically feasible conceptual topology using a building block-based design approach, while in the second phase, the conceptual topology is refined using shape/size optimization to meet specific elastic properties and manufacturing requirements. The efficacy of the framework is demonstrated through the design of microstructures with negative Poisson's ratios and the ability to achieve isotropic microstructures from a qualitative understanding of the conceptual designs.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Fucong Lu, Beicheng Lin, Xiangyu Ling, Chuanbiao Zhang, Yilin Zhu
Summary: This study proposes two bi-material missing rib-type anti-chiral metamaterials that integrate programmable coefficient of thermal expansion (CTE), Poisson's ratios (PR), and light-weight. Analytical solutions were derived to determine the geometries with targeted mechanical properties. The proposed designs exhibit special properties including light-weight, widely programmable CTE, and stable PR performance.
COMPOSITE STRUCTURES
(2023)
Article
Chemistry, Physical
Sai Liu, Haoyu Chen, Yizhu Li, Zhaoqun Du
Summary: Auxetic textiles with a negative Poisson's ratio have potential application value in sportsmen protection material. The study demonstrates that auxetic yarns with multiple core/wrap structure can achieve repeatable stretchability and auxetic effect, which could lead to the development of more comfortable, safer, and smarter protective textiles.
Review
Materials Science, Composites
Yuping Chang, Hong Hu
Summary: 3D fabrics with negative Poisson's ratio exhibit unique properties and have broad applications in various fields.
APPLIED COMPOSITE MATERIALS
(2022)
Article
Physics, Condensed Matter
Qi Zhang, Yilin Zhu, Yihe Wang, Jian Li
Summary: In this study, a novel 2D perforated auxetic metastructure is proposed and its mechanical properties and deformation mechanism are investigated. The results show that the proposed design exhibits remarkable performance in terms of Poisson's ratio and auxetic behavior, as well as relatively low local stress distribution.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Materials Science, Textiles
Zhuoran Liu, Gui Liu, Qiaoli Xu, Junli Chen, Yonggui Li, Taohai Yan, Zhaoqun Du
Summary: This paper successfully developed a new type of auxetic yarn through the braiding system, overcoming the issues present in traditional yarn structures. The study provides a research foundation for the mass production of stable auxetic yarns.
TEXTILE RESEARCH JOURNAL
(2022)
Article
Materials Science, Textiles
Yajie Gao, Xiaogang Chen, Rachel Studd
Summary: This research focuses on optimizing the structural parameters of helical auxetic yarns and evaluating their performance. The study found that factors such as helical angles, diameter ratio, and tensile moduli of the yarns influenced the auxetic effect. By optimizing these parameters, high-quality auxetic yarns with a wider range of machine settings were achieved, with a maximum negative Poisson's ratio of -9.6 experimentally obtained. The study also compared experimental, calculated, and finite element analysis results, highlighting the impact of initial helical angle, tensile moduli, and diameter ratio on the auxetic performance.
TEXTILE RESEARCH JOURNAL
(2021)
Article
Chemistry, Physical
Jakub W. Narojczyk, Mikolaj Bilski, Joseph N. Grima, Przemyslaw Kedziora, Dmitrij Morozow, Miroslaw Rucki, Krzysztof W. Wojciechowski
Summary: Negative Poisson's ratio materials challenge our traditional understanding of elastic properties and offer a wide range of potential applications. Modifying the structure of existing materials allows us to control elastic properties and anisotropy in cubic systems.
Article
Chemistry, Physical
Naeim Ghavidelnia, Mahdi Bodaghi, Reza Hedayati
Summary: In this study, an auxetic metamaterial structure known as idealized 3D re-entrant structure was analyzed, numerically calculated, and experimentally tested for its mechanical properties and Poisson's ratio using different methods. The results showed that the structure's Poisson's ratio is most influenced by the angle theta related to tension-dominated struts, while angle phi related to compression-dominated struts had the least influence, with compression-dominated struts providing strength and stiffness to the structure. Additionally, it was demonstrated that the structure could potentially have a zero Poisson's ratio within a specific range of theta and phi angles.
Article
Engineering, Mechanical
Luke Mizzi, Andrea Sorrentino, Andrea Spaggiari, Davide Castagnetti
Summary: This study used Finite Element Analysis to investigate the impact of ligaments on rotating unit systems, finding that ligaments have a profound influence on most mechanical properties and off-axis loading behavior, leading to increased anisotropy and reduced stiffness levels in systems with ligaments.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Mechanical
Ning Wang, Qingtian Deng
Summary: This study investigated the elastic properties of irregular honeycomb structures, finding that axial deformation has a significant influence on the structure. The elastic properties of the structure are affected by the enclosed area, shape, and material properties.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Sai Liu, Zhaoqun Du
Summary: Complex yarns with helical wrapping structure exhibit auxetic effect under axial tension and have wide application prospects. The initial helical angle is found to be one of the most important structural parameters. However, the experimental method has limitations and cannot effectively explain the deformation behavior or auxetic mechanism. A finite element model of the helical auxetic yarn is built to analyze the interactive relationship between the two components and the stress distribution mode. The effectiveness and accuracy of the model are verified by comparing with experimental results.
Article
Engineering, Civil
Hrishikesh G. Menon, Shammo Dutta, Aravind Krishnan, M. P. Hariprasad, Balakrishnan Shankar
Summary: This paper focuses on exploring and improving the deflection behavior of auxetic beam structures. Two novel design concepts are proposed and demonstrated to have significant improvements in load bearing response compared to conventional designs.
ENGINEERING STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Ali Jalali, Nasser Taghizadieh, Akbar A. Javadi
Summary: This research introduces a numerical method to design a two-dimensional auxetic microstructure with negative Poisson's ratios by combining FEM with BESO and SIMP optimization procedures. It demonstrates that either optimization method can be used to achieve microstructures with negative Poisson's ratio, and there are significant similarities between the results of both approaches. The study concludes with verification of the optimization outcomes through numerical and experimental means using 3D printing techniques.
BULLETIN OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Textiles
Hasan Kamrul, Adeel Zulifqar, Yadie Yang, Shuaiquan Zhao, Minglonghai Zhang, Hong Hu
Summary: This study conducted a geometrical analysis of auxetic woven fabrics based on foldable geometry and established a relationship between Poisson's ratio and tensile strain. Semi-empirical equations were used to predict the auxetic behavior of fabrics with different geometrical parameters, which were validated by experimental results showing excellent agreement.
TEXTILE RESEARCH JOURNAL
(2022)
Review
Materials Science, Composites
Yuping Chang, Hong Hu
Summary: 3D fabrics with negative Poisson's ratio exhibit unique properties and have broad applications in various fields.
APPLIED COMPOSITE MATERIALS
(2022)
Article
Materials Science, Composites
Minglonghai Zhang, Hong Hu, Hasan Kamrul, Shuaiquan Zhao, Yuping Chang, Mabel Ho, Nazmul Karim
Summary: This study presents a new type of three-dimensional auxetic composites with nearly isotropic NPR by embedding rigid re-entrant equilateral triangle inclusions into a soft matrix. Experimental and finite element analyses were conducted to investigate the effects of different structural parameters and materials on the deformation behaviors under compression. The results provide a new approach for developing isotropic NPR 3D composites and support the practical applications of auxetic materials.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Instruments & Instrumentation
Peng Fan, Yu Chen, Jian Xiong, Hong Hu
Summary: This paper presents a novel hybrid auxetic structure with enhanced mechanical properties by combining different structural forms. Through parameterized study, the geometric parameters of the hybrid structure are optimized to further improve its performance. The research results provide guidance for the optimized design of hybrid auxetic structures in practical applications.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Textiles
Yadie Yang, Zixin Ju, Po Ying Tam, Tao Hua, Hong Hu
Summary: This study focuses on the development of profiled poly(lactic acid) multifilaments to improve their moisture management properties. The results show that the knitted fabrics made with these profiled multifilaments demonstrate significantly improved moisture management performances compared to those made with circular poly(lactic acid) multifilaments, and are comparable or even better than fabrics made of polyester multifilaments.
TEXTILE RESEARCH JOURNAL
(2022)
Article
Instruments & Instrumentation
Laleh Khadem-Reza, Ehsan Etemadi, Mohammad Abbaslou, Hong Hu
Summary: In this study, four novel three-dimensional warp and woof structures with negative Poisson's ratio were designed and assembled using interlocking assembly method. The mechanical behavior and energy absorption properties of the designed structures were investigated through finite element simulation and experimental work.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Composites
Minglonghai Zhang, Mabel Mei Po Ho, Hong Hu
Summary: This paper investigates the low-velocity impact performance of 3D auxetic composite with re-entrant triangle inclusions through experiments and finite element simulations. The results show that auxetic composites exhibit better energy absorption and impact resistance compared to non-auxetic composites. The embedding of more inclusions further enhances the impact resistance of auxetic composites. The research provides insights into the impact performance of auxetic composites with random inclusions.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Textiles
Yuan Zhang, Hong Hu, Yordan Kyosev, Yanping Liu
Summary: Three-dimensional spacer fabric is a cushioning material with linear, plateau, and densification stages under compression. This article uses finite element simulation to explain the compression mechanism of a typical spacer fabric, including global deformation, local deformation, and internal contact behavior of spacer monofilaments. The linear stage is post-buckling, the plateau stage involves post-buckling, torsion, rotation, and contact, and the densification stage is due to contact between the spacer monofilaments and outer layers. Vertical spacer monofilaments contribute more to compression resistance compared to inclined ones.
TEXTILE RESEARCH JOURNAL
(2023)
Article
Engineering, Civil
Ehsan Etemadi, Mohaddeseh Gholikord, Muhammad Zeeshan, Hong Hu
Summary: The aim of this paper is to develop two novel in-plane auxetic structures with remarkable stiffness and negative Poisson's ratio (NPR) appropriate for compression and tensile load-bearing structures. The designed structures present tunable NPRs and approximately equal stiffnesses for both compressive and tensile loadings. The comparison results suggest that our developed structures can be considered as strong candidates for the next generation of SDM auxetic structures with high stiffness capability and noticeable NPR values.
THIN-WALLED STRUCTURES
(2023)
Review
Chemistry, Physical
Shanshan Dong, Hong Hu
Summary: Auxetic materials exhibit counter-intuitive behavior with a negative Poisson's ratio, resulting in improved mechanical properties and potential applications in various fields. This review focuses on the use of auxetic materials or structures in sensors, providing an overview of auxetic-based sensing devices. Material selection, structure design, preparation method, sensing mechanism, and performance are discussed. The relationship between the auxetic mechanism and sensing performance, as well as potential applications and future research directions, are also explored.
Article
Polymer Science
Muhammad Zeeshan, Hong Hu, Ehsan Etemadi
Summary: This study presents a geometrical analysis of three-dimensional auxetic woven structures based on semi-empirical equations. A three-dimensional fabric was developed with a special geometrical arrangement to achieve an auxetic effect. The geometrical model correlated well with experimental results, demonstrating its usefulness in predicting the auxetic behavior of 3D woven fabrics with different structural parameters.
Article
Materials Science, Textiles
Yuping Chang, Yanping Liu, Hong Hu
Summary: The auxetic property of the macro-porous rotating square structure was studied using experimental and numerical methods. An elastic base material was proposed to improve the strength of the structure while maintaining its auxetic behavior. Numerical analysis was conducted to explain the auxetic effect observed in the laminated fabrics. The results showed agreement between the simulation and experimental results, and highlighted the importance of the modulus difference between the frame and the base materials for the generation of the auxetic effect.
JOURNAL OF INDUSTRIAL TEXTILES
(2023)
Article
Chemistry, Analytical
Qingguo Wen, Pengju Li, Zhengkai Zhang, Hong Hu
Summary: This research paper introduces an innovative technique for measuring displacement using auxetic tubular structure (ATS). The proposed method converts the variation in light transmission into a corresponding variation in output voltage by capitalizing on the relationship between the elastic deformation-induced change in transmittance of the ATS and the output current of the solar cell. The experimental results demonstrate the effectiveness and feasibility of the proposed method, showing a favorable linear relationship between the input and output of the measurement system with an acceptable sensitivity, repeatability, and reliability.
Article
Mechanics
Ehsan Etemadi, Mahbubeh Hosseinabadi, Fabrizio Scarpa, Hong Hu
Summary: This paper presents the design, 3D printing, and testing of a novel type of auxetic structure. The results show that the structure with Dumbell-shaped struts exhibiting negative Poisson's ratio outperforms other structures in terms of specific stiffness, specific energy absorption, and Poisson's ratio. The study also investigates the effects of geometry parameters on the structure's performance.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Textiles
Chang Yuping, Yanping Liu, Zhao Shuaiquan, Hu Hong
Summary: This study explores the manufacturing of 3D warp-knitted fabrics with auxetic properties using warp knitting technology. Different geometric designs were evaluated for their auxetic behavior in various directions. The research offers an alternative method for producing auxetic warp-knitted spacer fabrics directly through a single knitting process.
TEXTILE RESEARCH JOURNAL
(2022)
