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.
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
Construction & Building Technology
Ru Zhong, Xin Ren, Xiang Yu Zhang, Chen Luo, Yi Zhang, Yi Min Xie
Summary: Auxetic materials and honeycomb sandwich structures exhibit desirable mechanical properties, and a novel concrete composite with auxetic layered honeycomb has been designed and investigated for exploring their load-bearing performance. The results show that the layered structure has higher initial peak stress, stable platform stress, improved shear resistance, and overall stability.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Niranjan Kumar Choudhry, Biranchi Panda, Uday Shanker Dixit
Summary: This article summarizes the latest advances in manufacturing and applications of auxetic materials, which have negative Poisson's ratio. The ability to tailor their macroscopic properties through 3D printing technologies has generated significant interest in various industries. The focus of this review is on the energy absorption performance of re-entrant structures manufactured by fused deposition modeling 3D printing process. It provides an outlook on future research in designing and modeling re-entrant structures for different industrial applications.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Review
Engineering, Civil
Rafael Augusto Gomes, Lucas Antonio de Oliveira, Matheus Brendon Francisco, Guilherme Ferreira Gomes
Summary: This paper summarizes the definitions, designs, analyses, optimizations, mechanical properties, and specific applications of various auxetic tubular structures. It highlights the importance of additive manufacturing and numerical analysis in manufacturing and analyzing these structures. The purpose of this paper is to provide researchers and engineers with a step-by-step methodology for developing and applying auxetic tubular structures.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Dianwei Gao, Chunwei Zhang, Jianhua Zhang
Summary: This study investigates the Poisson's ratio of 2D and 3D nested helical structures through theoretical analysis and numerical simulations. The results show that impact velocity strongly influences the energy absorption and deformation behavior of the proposed 3D helical structure, increasing the beam radius reduces energy absorption capability, but the yield strength of nodes has minimal effect on energy absorption capability, and impact direction affects the energy absorption performance depending on the crushing strain. These findings can be utilized to optimize the design of the proposed novel 3D helical honeycombs for various applications, such as impact energy absorbers and vibration-resistant dampers.
APPLIED SCIENCES-BASEL
(2023)
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
Instruments & Instrumentation
Suleyman Nazif Orhan, Seydanur Erden
Summary: This paper presents a comparative numerical study of different 2D and 3D auxetic structures, and investigates the characteristics and mechanical properties of elliptic holes and lozenge grids in the 3D case. The findings show that the elliptical holes structure exhibits a higher negative Poisson's ratio and the 3D re-entrant and 2D arrowhead structures outperform the other auxetics in terms of Young's modulus and stiffness values.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Ying Gao, Xingyu Wei, Xingkai Han, Zhengong Zhou, Jian Xiong
Summary: This paper introduces a new methodology for generating 3D lattice structures with negative Poisson's ratio behavior and systematically investigates the elastic properties of these structures, finding that the homogenized Poisson's ratio effect can be tuned in a wide range along different principal axes. The design flexibility of these structures would help to expand and accelerate their adoption in engineering applications.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Computer Science, Interdisciplinary Applications
Qiang Gao, Wei-Hsin Liao, Liangmo Wang, Chen Huang
Summary: A novel structure is proposed to enhance energy absorption by introducing thin-walled tube as the inner liner tube in cylindrical structures with negative Poisson's ratio (C-NPR). Parametric analysis and optimization techniques improve crashworthiness performance, increasing specific energy absorption to 10.26 kJ/kg.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Materials Science, Multidisciplinary
Ying Gao, Zhengong Zhou, Hong Hu, Jian Xiong
Summary: This paper introduces a new concept of 3D auxetic lattice structures with high stiffness and explores a method for rapidly fabricating them. Theoretical models are developed to predict the homogenized elastic properties of the structures, and the directional dependence of these properties is investigated in detail. Experimental and numerical analysis confirm that the structures are suitable for uniaxial loading and exhibit excellent load bearing capacity and negative Poisson's ratio effects. Efforts to promote the wider use of these structures in various applications are emphasized.
MECHANICS OF MATERIALS
(2021)
Article
Polymer Science
Jonas Hufert, Axel Grebhardt, Yanling Schneider, Christian Bonten, Siegfried Schmauder
Summary: Auxetic structures have a unique property to expand transversely when loaded due to their negative Poisson's ratio. This behavior is determined by the structure rather than the materials used, allowing for new design possibilities. The complex geometry of auxetic structures makes additive manufacturing processes the cost-effective production method. This project focuses on producing and characterizing auxetic structures using polylactide acid (PLA), polybutylene adipate terephthalate (PBAT), and their blends, with a specific emphasis on their Poisson's ratio.
Article
Materials Science, Multidisciplinary
Qiqi Li, Xichang Li, Liuyu Zhan, Tiefang Zou, Xiaomin Chen, Xianzheng Lu
Summary: A hollow auxetic cylinder lattice structure with tapered three-dimensional reentrant cells and connecting plates is proposed. The compressive performance of the structure is studied using finite element analysis and compression test, revealing excellent energy absorption, negative Poisson's ratio properties, and unique rotational deformation mode during compression. The influences of structural parameters are further investigated, with the maximum rotation angle and minimum negative Poisson's ratio found to be 37.32 degrees and -0.653, respectively. The structure exhibits various functional properties and holds great potential for applications.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Amit Rawal, Danvendra Singh, Ashish Rastogi, Sumit Sharma
Summary: This study explores the design principles and analytical methods for achieving negative Poisson's ratio in carbon nanotubes, employing energy minimization, structural modeling, and force-balance as means to target the desired outcome. The research highlights the significant role played by the alignment of carbon nanotubes in augmenting the magnitude of negative Poisson's ratio.
EXTREME MECHANICS LETTERS
(2021)
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, Textiles
Muhammad Zeeshan, Hong Hu, Adeel Zulifqar
Summary: Researchers have successfully developed 3D woven structures with in-plane auxetic behavior using weaving technology. They found that the appropriate structural parameters can achieve a higher negative Poisson's ratio.
TEXTILE RESEARCH JOURNAL
(2022)
Article
Materials Science, Textiles
Chang Yuping, Yanping Liu, Hu Hong
Summary: In this research, a novel type of auxetic fabrics based on rotating square geometry is proposed and manufactured using laser cutting and lamination technique. The deformation behavior and auxetic effects of the laminated fabrics are investigated through tensile tests. The results show that the auxetic behavior of the laminated fabrics mainly depends on the initial modulus difference between the base material and the laminated frame material, as well as the initial intersection angle and size of square units. Additionally, three-layer laminated fabrics are found to be more desirable in terms of avoiding out-of-plane deformation and extending the tensile strain range of auxeticity.
TEXTILE RESEARCH JOURNAL
(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)
