Article
Chemistry, Multidisciplinary
Kaveh Barri, Qianyun Zhang, Jake Kline, Wenyun Lu, Jianzhe Luo, Zhe Sun, Brandon E. E. Taylor, Steven G. G. Sachs, Lev Khazanovich, Zhong Lin Wang, Amir H. H. Alavi
Summary: Creating lightweight and mechanically tunable concrete systems with energy harvesting and sensing functionalities by integrating the nanogenerator and mechanical metamaterial paradigms. The composite structures induce contact-electrification between layers, enabling the power output of the prototypes to reach 330 mu W. These metamaterial concrete systems have the potential to design smart civil infrastructure systems with advanced functionalities.
ADVANCED MATERIALS
(2023)
Article
Mechanics
Kai Zhang, Liyuan Qi, Pengcheng Zhao, Cheng Zhao, Zichen Deng
Summary: This paper investigates a negative-stiffness mechanical metamaterial consisting of reconfigurable beam elements that can tune its bandgap through deformation. The study shows that the metamaterial exhibits different band structures and band gap ranges under different deformation states, allowing for bandgap tuning. The research provides a new avenue for the design and study of negative-stiffness mechanical metamaterials with bandgap tuning capabilities.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Qiqi Li, Liuyu Zhan, Lin Hu, Xiujuan Miao, Tiefang Zou, Xin Liu
Summary: This study proposes a straw-shaped structure inspired by the folds of straw, and two samples are prepared using selective laser sintering technology. The samples can spontaneously recover to their original shapes after compression experiments. The structure shows significant non-stable and multi-stable properties, and the deformation mode is similar to stacked porcelain bowls. The study also discusses the potential applications of these structures and provides a valuable reference for the study of non-stable structures.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Aiguo Zhao, Chuang Liu, Yelin Zheng, Anfu Zhang, Peng He, Hong Chen, Gang Wu, Mangong Zhang, Tao Wu, Guoqing Gu
Summary: Studies on multi-stable metamaterials have often neglected the viscoelastic properties of the substrate, resulting in inaccurate evaluation of shock migration performance. This study investigates a multi-stable mechanical metamaterial prototype and develops a model to evaluate the dynamic characteristics of the substrate. Experimental tests and simulations reveal the prototype's energy absorption and shock reduction capabilities, showing promising results for protective facility design.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Guilin Wen, Gaoxi Chen, Kai Long, Xuan Wang, Jie Liu, Yi Min Xie
Summary: This study introduces a novel ZBSO metamaterial with tailored multistage stiffness based on crease customization and stacking strategies. By varying microstructures through introducing new creases and altering stacking ways, the multistage stiffness of the ZBSO metamaterial is effectively tailored, demonstrating outstanding advantages compared to traditional mechanical metamaterials.
MATERIALS & DESIGN
(2021)
Article
Engineering, Civil
Huan Lu, Xiaopeng Wang, Tianning Chen
Summary: This paper investigates a negative Poisson's ratio (NPR) mechanical metamaterial called star-circle honeycomb (SCH), which exhibits enhanced stiffness compared to the classical star-shaped honeycomb (SH). A theoretical model is built and validated by finite element method (FEM) to calculate the effective elastic properties of SCH. The results show that SCH has significantly enhanced elastic modulus and the elastic properties can be adjusted by selecting parameters. The study provides new design ideas for improving the stiffness and selecting the optimal loading direction of metamaterials.
THIN-WALLED STRUCTURES
(2022)
Article
Physics, Applied
Jack E. Pechac, Michael J. Frazier
Summary: In this Letter, the dynamics of a multi-stable metamaterial with an elastic substrate are considered, aiming to achieve precise control and remote determination of the position of a transition wavefront. A (strain-)tunable potential energy landscape is utilized to convey the wavefront between stabilizing defects. By separating acoustically distinct domains, the position of the front is revealed through the time interval between excitation and echo. The study explores the application of these mechanisms in mechanical multi-level memory and expects that it will enhance the development and applicability of multi-stable metamaterials.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Simone Zanotto, Giorgio Biasiol, Paulo V. Santos, Alessandro Pitanti
Summary: The study demonstrates a method to break the symmetry of known negative refraction systems by using a metamaterial with an asymmetric unit cell. It relies on the specific shape of the Bloch mode isofrequency curves. The research is of significance for the development of advanced technologies.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Multidisciplinary
KangKang Chen, GuoWei Tu, XingJian Dong, YiFan Huangfu, ZhiKe Peng
Summary: In this study, a novel plate-type metamaterial with a two-dimensional bandgap was designed to achieve low-frequency and broadband bandgaps. The bandgaps can be adjusted by mass re-distribution, stiffness design, and excitation amplitude. The research results can provide new ideas for structural design and engineering applications of mechanical metamaterials.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Mechanics
Yutong Fu, Wei Liu
Summary: This paper proposes a novel mechanical metamaterial with controllable stiffness based on curved beam unit cells, which are mechanically analyzed, optimized, and fabricated using 3D printing techniques. The multi-layered mechanical metamaterials exhibit advantages of improved specific stiffness and reduced spatial volume, providing a new design principle for the development of mechanical metamaterials.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Niklas Neumann, Sascha Thinius, Gideon Abels, Andreas Hartwig, Katharina Koschek, Laura Boskamp
Summary: A synthesis approach was investigated for crosslinkable hyperbranched prepolymers with adjustable degrees of methylation and methacrylation, achieving full conversion of hydroxyl groups. The substitution degrees of methacrylate could be adjusted by catalyzed esterification using predefined partially methylated polyglycerol-based precursors. The combination of methacrylic anhydride, triethylamine, and 4-dimethylaminopyridine was proven effective for complete conversion of primary and secondary hydroxyl groups. NMR, IR, and Raman spectroscopy confirmed the insertion of methacrylic crosslinking groups in the polymeric backbone. The photopolymerization of obtained prepolymers resulted in higher crosslink density, stiffness, and glass transition temperature with increasing methacrylate content.
Article
Engineering, Mechanical
Pengcheng Zhao, Kai Zhang, Liyuan Qi, Zichen Deng
Summary: This study established a dynamic model of a 3D chiral mechanical metamaterial to analyze the band structure and transmission response under different configurations. The results show that chirality can convert longitudinal waves into transverse waves, leading to vibration attenuation and the ability to predict band gaps.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Pengcheng Zhao, Kai Zhang, Liyuan Qi, Zichen Deng
Summary: This paper investigates the dynamic properties of a 3D chiral mechanical metamaterial, showing that the isotactic configuration converts longitudinal waves into transverse waves due to chirality, leading to vibration attenuation independent of band gaps. Band gaps appear in the syndiotactic configuration's band structures, and the vibration mode of ligaments can be used to predict band gaps. The study also demonstrates the potential for practical applications of vibration suppression using gradient and programmable design.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Quan Zhang, Dengke Guo, Gengkai Hu
Summary: A new design strategy for a programmable quasi-zero-stiffness (QZS) mechanical metamaterial is proposed in this research, which can achieve tailored stair-stepping force-displacement curves with multiple QZS working ranges and ultra-low frequency vibration isolation capability. The mechanism solely depends on the structural geometry of curved beams and is materials-independent, opening up a new avenue for innovating compact and scalable QZS isolators.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Mechanics
Shuai Chen, Xiaojun Tan, Jiqiang Hu, Bing Wang, Lianchao Wang, Yajun Zou, Linzhi Wu
Summary: This study investigates the potential of negative stiffness (NS) mechanical metamaterials in the field of energy absorption. The study proposes and fabricates a reusable continuous carbon fiber reinforced polymer (CFRP) composite NS mechanical metamaterial. It comprehensively understands the structural quasistatic mechanical properties through compression tests and numerical simulations, verifies the repeatability of the metamaterial through cyclic compression, and investigates the influence of structural parameters and stacking sequence on the mechanical properties. The study also conducts plate-impact tests to evaluate the cushion performance of the metamaterial.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Ying Li, Weiguo Li, Yong Deng, Jiaxing Shao, Jianzuo Ma, Yong Tao, Haibo Kou, Xianhe Zhang, Xuyao Zhang, Liming Chen, Fanglan Peng
JOURNAL OF MATERIALS SCIENCE
(2018)
Article
Engineering, Mechanical
Ying Li, Weiguo Li, Jianzuo Ma, Shifeng Zheng, Ziyuan Zhao, Mengqing Yang, Pan Dong, Liming Chen
EXTREME MECHANICS LETTERS
(2020)
Article
Engineering, Mechanical
Xin Pan, Liming Chen, Houchang Liu, Weiming Qin, Bing Du, Weiguo Li
Summary: The impact resistance of corrugated sandwich panels made from thermoplastic composites (TPC) was investigated in this study. The results show that TPC sandwich panels exhibit an overall collapse response, good integrity, and stability. The impact resistance can be further improved by adjusting the thickness of the top and middle layers.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Mechanics
Xiaobo Liu, Shaowei Zhu, Liming Chen, Weiguo Li, Houchang Liu, Xin Pan
Summary: In this study, self-locked structures with honeycombs fillings were proposed to improve their energy absorption (EA) capacity. The deformed configurations and EA performance of self-locked structures with and without honeycombs fillings were investigated. It was found that self-locked structures with honeycombs fillings not only exhibited self-locking effect, but also greatly improved load-carrying capacity and EA capacity.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Mechanics
Xin Pan, Liming Chen, Jianqiang Deng, Wanqi Zhao, Shuai Jin, Bing Du, Yong Chen, Weiguo Li, Tao Liu
Summary: This study investigates the impact response and damage mechanisms of intersected corrugated sandwich panels (ICSPs) and regular corrugated sandwich panels (RCSPs) under different impact conditions. The results show that ICSPs have better integrity and higher energy absorption capacity compared to RCSPs, indicating their superior impact resistance.
COMPOSITE STRUCTURES
(2023)
Article
Polymer Science
Shuai Jin, Liming Chen, Shaowei Zhu, Bing Du, Tao Liu, Xianbo Hou
Summary: This research investigates the effects of adhesive, mechanical joining, and hybrid bonding techniques on thermoplastic composite materials. The findings suggest that hybrid bonding enhances the strength of composite joints while slightly reducing stiffness.
Article
Engineering, Multidisciplinary
Keyu Zhu, Xitao Zheng, Jing Peng, Jiaming Sun, Ruilin Huang, Leilei Yan
Summary: This paper discusses the influence of multiple impacts on the compression strength of honeycomb sandwich structures with composite face sheets. It is found that the size of the impactor affects the turning point of the compression strength. Additionally, high impact energy leads to damage in the bottom face sheet and reduces the overall compression strength.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Danqian Wang, Yanfei Yue, Jueshi Qian
Summary: Magnesium Potassium Phosphate Cement (MKPC) as a binder for steel rebars shows improved corrosion resistance when subjected to carbonation, due to the increase in pH and the formation of a more protective oxide film.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Zhibin Li, Wenyu Wang, Pengcheng Xue, Xingyu Wei, Jian Xiong
Summary: This work proposes a design approach and manufacturing method for carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cones (CSTC) to improve their anti-debonding ability and ensure reliability. The study establishes theoretical models for CSTCs' stiffness and failure modes, which are verified through experiments and finite element analysis (FEA). The research reveals the effect of geometric parameters on failure modes and performs an optimal design for CSTC structures. The findings have significant implications for the design and application of lightweight CSTCs in constructions, such as launch vehicle adapters.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mingyu Zhang, Lei Chu, Jiahua Chen, Fuxun Qi, Xiaoyan Li, Xinliang Chen, Deng-Guang Yu
Summary: This review summarizes the different structures and construction methods of fibrous membranes with asymmetric wettability. It also reviews the biological applications of these membranes and suggests future challenges.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
E. Mofakhami, L. Gervat, B. Fayolle, G. Miquelard-Garnier, C. Ovalle, L. Laiarinandrasana
Summary: This study investigates the effects of fibre concentration on the mechanical response of welded glass-fibre-reinforced polypropylene (GF-PP). Experimental observations reveal a significant reduction in weld ratio, up to 60%, indicating a decreased strength compared to the bulk material. Increasing fibre content in the welded material results in a decrease in stress at break and strain at the maximum stress. The use of DIC technique and X-ray microtomography further confirms the localized strain amplification in the welded zone due to the significant increase in fibre density.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Emad Pourahmadi, Farjad Shadmehri, Rajamohan Ganesan
Summary: This research compares the mechanical properties of laminates manufactured using automated fiber placement and conventional autoclave curing methods. The results show that laminates manufactured using automated fiber placement have a lower interlaminar shear strength compared to laminates reconsolidated using autoclave curing. A finite element simulation method is proposed to quantitatively analyze these differences.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Johnny Jakobsen, Benny Endelt, Fahimeh Shakibapour
Summary: This study proposes a new bolted/pinned joining method for composite applications, which improves load transfer by introducing a patch-type reinforcement. Experimental results demonstrate significant improvements in both static and fatigue load conditions compared to existing methods. Finite element simulations highlight the advantage of this method, as it creates a more efficient load-transferring mechanism through different stress distributions.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper proposes a novel approach to assess multi-crack behavior in layered fiber-polymer composites. The generated Compliance and R-curves provide useful insights into understanding the multiple delamination process and allow for separate evaluation of strain energy release rate (SERR) for each crack. The developed cohesive zone model successfully simulates the failure process zone of three parallel cracks, showing good agreement between the numerical model and experimental results.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. Krishnamurthy, Krishnan Balasubramaniam
Summary: The induction heating process can accurately identify fiber orientation and stacking order, making it a valuable tool for large-area inspection and quality control in manufacturing fiber-reinforced composites.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mehdi Mahdavi, Abbas Zolfaghari
Summary: This study aims to improve the recovery forces of shape memory polymers (SMPs) through material extrusion additive manufacturing. By using glass fiber (GF) as reinforcement and manufacturing multi-layer composite specimens, it was found that PLA with 6.62% GF exhibited the best recovery force, which was further optimized through annealing heat treatment.
COMPOSITES PART B-ENGINEERING
(2024)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Summary: The demand for multifunctional, transparent epoxy resin with superior dielectric, mechanical, and fire-safety performances is increasing in modern industries. Researchers have developed an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe epoxy resin, which maintains high transparency and improves UV-blocking property. The addition of 10 wt% ESD results in improved mechanical properties, decreased dielectric constant and loss, and outperformance compared to other fire-safe epoxy resins. This research provides an effective method for developing multifunctional flame-retardant epoxy resin.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Bo Pang, Heping Zheng, Zuquan Jin, Dongshuai Hou, Yunsheng Zhang, Xiaoyun Song, Yanan Sun, Zhiyong Liu, Wei She, Lin Yang, Mengyuan Li
Summary: This study develops an internal superhydrophobic material (ISM) using waste denitrification fly ash, which maintains stable hydrophobicity under harsh conditions of use and does not rely on expensive fluor-based surface modifications. The synthesized ISM has excellent matrix strength, strong waterproof properties, and retains superhydrophobicity even at damaged or friction interfaces.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(2024)