Article
Chemistry, Multidisciplinary
Olly Duncan, Nicolas Bailly, Tom Allen, Yvan Petit, Eric Wagnac, Andrew Alderson
Summary: This study aimed to measure the effect of strain rate on the stiffness and Poisson's ratio of auxetic and conventional foams. The results showed that the Poisson's ratio of auxetic foams halved at high strain rates, while the Young's moduli of conventional foam approximately doubled at the highest applied strain rate.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
V Harinarayana, Y. C. Shin
Summary: In this study, a comprehensive design and fabrication of a three-dimensional axisymmetric auxetic structure that exhibits uniform and axisymmetric transverse deformation under longitudinal compression loading is proposed. The design of the metamaterial is generated by revolving a two-dimensional parabolic curve along the axis of rotation and subsequently perforating the structure periodically with elliptical voids. The significance of the perforations is elucidated by comparing the metamaterial structure to a plain structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Civil
Xin Ren, Yi Zhang, Chuan Zhen Han, Dong Han, Xiang Yu Zhang, Xue Gang Zhang, Yi Min Xie
Summary: By filling rigid polyurethane foam into hollow auxetic tubes, this study successfully enhanced the energy absorption capacity. The composite foam-filled auxetic tubes demonstrated superior energy absorption compared to single foams and hollow tubes. Geometrical parameters such as wall thickness and ellipticity significantly impact the structural deformation mode and energy absorption of the FFATs.
THIN-WALLED STRUCTURES
(2022)
Article
Multidisciplinary Sciences
M. J. Khoshgoftar, A. Barkhordari, M. Limuti, F. Buccino, L. Vergani, M. J. Mirzaali
Summary: Sandwich panel structures with re-entrant core lattices have been studied for their mechanical properties. The study investigated the response of a three-layered sandwich plate with a re-entrant core lattice under flexural bending, analyzing the effects of different geometrical parameters of the lattice structures. The results showed that the core structures with auxetic behavior resulted in higher bending strength and minimum out-of-plane shear stress, indicating their potential for advanced engineering applications in aerospace and biomedical fields.
SCIENTIFIC REPORTS
(2022)
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)
Article
Materials Science, Textiles
Hoa Nguyen, Raul Fangueiro, Fernando Ferreira, Quyen Nguyen
Summary: This article explores the potential applications of auxetic materials in defense. Auxetic materials have superior properties due to their negative Poisson's ratio, expanding when stretched and shrinking when compressed. These materials have improved properties such as shear resistance, indentation resistance, and energy absorption, making them appealing for various industries. The article discusses recent advancements in auxetic materials and structures, but notes that their use in defense is still limited. Its main goal is to serve as a foundation for future research in this field.
TEXTILE RESEARCH JOURNAL
(2023)
Article
Engineering, Mechanical
Qicheng Zhang, Fabrizio Scarpa, David Barton, Yunpeng Zhu, Zi-Qiang Lang, Dayi Zhang, Hua-Xin Peng
Summary: This study describes large strain quasi-static and impact tests of a new class of low-cost uniaxially thermoformed transverse isotropic auxetic foams. The results show that these foams only exhibit auxetic behavior when loaded along the transverse direction to the uniaxial thermoforming compression. The impact energy absorption performance of the foams is enhanced, and the Poisson's ratio approaches 0 at large strains.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Nejc Novak, Olly Duncan, Tom Allen, Andrew Alderson, Matej Vesenjak, Zoran Ren
Summary: This study analyzed the shear moduli of conventional and auxetic open-cell polymer foams, finding that the measured shear moduli of auxetic foams were generally lower, and the calculated shear moduli were lower than the measured values.
MECHANICS OF MATERIALS
(2021)
Article
Instruments & Instrumentation
O. Duncan, G. Leslie, S. Moyle, D. Sawtell, T. Allen
Summary: Auxetic closed cell foam can be manufactured using pressure-vessel methods, with a noticeable settling period observed post processing. Placing the foam in a vacuum can reduce the settling period to within 24 hours.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Yongtao Yao, Yuncheng Xu, Hao Chen, Yuying Kang, Yanju Liu, Jinsong Leng
Summary: This study presents a feasible approach to fabricate shape memory foam with auxetic property using the second curing method, achieving tunable mechanical properties and wireless actuation.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Qicheng Zhang, Xindi Yu, Fabrizio Scarpa, David Barton, Kathryn Rankin, Zi-Qiang Lang, Dayi Zhang
Summary: This study investigates the influence of the anisotropy of the foam material on the performance of auxetic foams produced through thermoforming. The results show that the anisotropic nature of the baseline foam plays a significant role in determining the mechanical behavior of the thermoformed auxetic foams. The study also demonstrates that significant negative Poisson's ratios can be achieved in certain conditions, where the foam is thermoformed in specific directions and loaded along a particular axis.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Mechanical
Maryam Morvaridi, Giorgio Carta, Federico Bosia, Antonio S. Gliozzi, Nicola M. Pugno, Diego Misseroni, Michele Brun
Summary: A novel two-dimensional hierarchical auxetic structure is proposed, utilizing interactions between different scale cuts to achieve a Poisson's ratio close to the minimum limit. Experimental validation on a polymeric specimen demonstrates the effectiveness of the structure, which shows potential for various engineering applications.
EXTREME MECHANICS LETTERS
(2021)
Article
Instruments & Instrumentation
M. Parisi, T. Allen, M. Colonna, N. Pugno, O. Duncan
Summary: Auxetic closed cell foams and highly viscoelastic foams have the potential to improve impact protection. The study found that auxetic foams outperformed unconverted foams during severe impacts, exhibiting a reduced peak force and increased indentation resistance. However, infusing the auxetic foams with shear thickening gel had minimal impact on the reduction in peak impact force, potentially due to low and non-uniform levels of infusion.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Polymer Science
Xiao Yuan Chen, Ouassim Hamdi, Denis Rodrigue
Summary: This study proposes a method to convert polyethylene foams into auxetic materials with negative Poisson's ratios, which improves their mechanical properties and energy absorption ability. By optimizing the processing conditions, low-density foams with negative Poisson's ratios were obtained. These foams can be used in various applications including sport and military protection equipment.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Qicheng Zhang, Wenjiang Lu, Fabrizio Scarpa, David Barton, Kathryn Rankin, Yunpeng Zhu, Zi-Qiang Lang, Hua-Xin Peng
Summary: The study presents a simplified procedure for manufacturing auxetic PU foam using a single direction thermoforming compression process on conventional open cell foam samples. Auxetic foams exhibit transverse isotropy with specific compression ratios required to achieve auxeticity. Numerical models built from 3D scans show good agreement with experimental data and help explain deformation mechanisms of auxetic foams.
MATERIALS & DESIGN
(2021)
Article
Engineering, Mechanical
Qicheng Zhang, Xindi Yu, Fabrizio Scarpa, David Barton, Yuying Xia, Alexander Shaw, Yunpeng Zhu, Zi-Qiang Lang
Summary: This work investigates the experiments and models of auxetic foams under low-frequency and variable amplitude 3-point bending loading. A custom test rig is designed for dynamic testing of auxetic PU foam, and different cutting orientations and thermoforming compression ratios are tested and compared. The results show that the dynamic modulus of the foams increases with compression ratio, while the dynamic loss factor is minimally affected. Auxetic PU foam exhibits amplitude-dependent stiffness and loss factors.
NONLINEAR DYNAMICS
(2023)
Article
Materials Science, Composites
Guilherme Germano Braga, Fabio Assuncao Rosa, Julio Cesar dos Santos, Gilberto Garcia del Pino, Tulio Hallak Panzera, Fabrizio Scarpa
Summary: Biobased products are important for the efficient use of natural resources and sustainable development. This study investigates the use of grass fibers combined with castor oil polyurethane or epoxy matrices to create biocomposites for fiber metal laminates. The choice of polymer type and fiber length affects the mechanical properties of the composites, and the lower porosity leads to improved performance. Biobased laminates offer potential advantages over epoxy composites and can be used in automotive, civil construction, and aeronautical applications for sustainable industrial designs.
POLYMER COMPOSITES
(2023)
Article
Engineering, Civil
Yu Ming Luo, Ting Ting Huang, Yi Zhang, Hang Hang Xu, Yi Min Xie, Xin Ren
Summary: A novel seismic metamaterial (SM) composed of steel and rubber is proposed for attenuating ultra-low frequency seismic Lamb waves. The band structure and bandgaps of SMs are analyzed using the finite element method and the vibration modes of waves at the bandgap boundary frequency are studied. The authenticity of the bandgaps is confirmed through the analysis of the transmission spectrum. Parameter analyses reveal that geometric variables, material properties, equivalent mass density, and structural matrix forms significantly affect the bandgap and transmission properties. The proposed SM has a smaller size while maintaining wide bandgaps at 0-20 Hz, effectively covering the 2 Hz seismic peak spectrum that causes building destruction.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Dong Han, Yi Zhang, Xiang Yu Zhang, Yi Min Xie, Xin Ren
Summary: Novel auxetic tubes (NAT) were designed, fabricated and examined, showing improved specific energy absorption (SEA) without sacrificing the auxetic characteristic. The effect of unit cell parameters on the mechanical properties of NAT tubes was explored, suggesting that rib reduction can enhance SEA without sacrificing the auxetic effect. Three novel ribbed auxetic tubes (NRAT) were proposed, with the addition of a straight rib to the inner long axis of the ellipse found to improve SEA. The larger the straight rib width, the higher the energy absorption. The stability of 3D auxetic tubular metamaterial was found to be greater than that of 2D auxetic thin-plate metamaterial.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Xin Ren, Dong Han, Long Sun, Xue Gang Zhang, Wei Jiang, Zhi Tao, Yi Min Xie, Fan Yang, Guo Xing Lu
Summary: Aluminum foam-filled circular auxetic metamaterials were designed and investigated in this study. The mechanical properties and deformation modes of the proposed aluminum foam-filled auxetic tubes were analyzed using experimental and numerical methods. The energy contribution ratio of the interaction between the aluminum foam and auxetic tube improves with the aluminum foam's density. The AFFAT with a higher ratio of the elliptical major axis to the minor axis has increased compression load efficiency. Among the investigated composite structures, the AFFAT has the highest compression load efficiency.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Ru Yuan Huo, Dong Han, Yi Zhang, Wei Jiang, Le Yang Fan, Xin Wei Peng, Ge Chen Jie Shi, Ming Hao Chu, Xiang Yu Zhang, Yi Min Xie, Xin Ren
Summary: The incorporation of aluminum foam in auxetic tubes enhances stability, stiffness and energy absorption. This study compared the mechanical properties of auxetic circular and square tubes. The foam-filled auxetic square tube (FFAST) showed the best specific energy absorption (SEA) of 1.45 and exhibited a pronounced auxetic effect. The finite element method was used to analyze FFAST, finding that thinner wall thickness leads to greater SEA and decreasing ellipticity increases yield load and SEA.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Yuanpeng Liu, Ting-Uei Lee, Antiopi Koronaki, Nico Pietroni, Yi Min Xie
Summary: Space frame structures are favored in contemporary free-form architectural designs for their elegant appearance and excellent structural performance. However, the use of different shaped nodes in doubly-curved space frame structures leads to high manufacturing costs. In this study, a new clustering-optimization framework is proposed to reduce the variety of node shapes, achieving congruence while approximating a target surface. The method is validated through numerical examples and demonstrated in a complex architectural project.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Hang Hang Xu, Hui Chen Luo, Xue Gang Zhang, Wei Jiang, Xing Chi Teng, Wei Qiu Chen, Jie Yang, Yi Min Xie, Xin Ren
Summary: Auxetic materials have been extensively studied due to their unique mechanical properties and deformation modes. However, their practical engineering applications are limited by their low stiffness. This study combines re-entrant aluminum honeycomb with aluminum foam to enhance the stiffness of auxetic materials. Experimental and numerical investigations on the mechanical properties and deformation modes are conducted, along with the analysis of the effects of geometrical parameters. The proposed auxetic composite structures show promising applications in vehicle engineering, protective engineering, and aerospace engineering due to their superior performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Review
Green & Sustainable Science & Technology
Mohamed Gomaa, Sascha Schade, Ding Wen Bao, Yi Min Xie
Summary: The increasing awareness of the negative environmental impact of cement-based products has led to a reconsideration of earth construction within the digital framework of Industry 4.0. The research on advanced manufacturing of earth construction has been intensified, particularly in additive manufacturing of clay-rich soil. However, limited research has been conducted on mechanizing methods such as rammed earth. This paper collected and analyzed the latest research on the advanced manufacturing of rammed earth construction, providing insights and a roadmap for its digital manufacturing.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Mechanics
Yi Zhang, Yang Pan, Dong Han, Wei Zhong Jiang, Wei Jiang, Xue Gang Zhang, Xing Chi Teng, Xi Hai Ni, Xin Ren
Summary: A novel metamaterial with enhanced programmable CTE range is proposed in this study by combining bending-dominated and stretching-dominated unit cells. The design process includes replacing the sides of the triangle unit cell with bi-material anti-chiral unit cells to achieve thermal deformation. The results demonstrate significant improvements in the CTE range, design smoothness, continuity, and flexibility of the metamaterial.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Yunzhen He, Zi-Long Zhao, Xiaoshan Lin, Yi Min Xie
Summary: This paper presents a method for shape and topology optimization problems, which controls the structural complexity by integrating a hole-filling method into the evolutionary structural optimization framework. The results show that the proposed method can generate structurally efficient designs with controllable topologies and improve the stiffness of the optimized structures.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Xing Chi Teng, Wei Jiang, Xue Gang Zhang, Dong Han, Xi Hai Ni, Hang Hang Xu, Jian Hao, Tong Guo, Yu Fei Wu, Yi Min Xie, Xin Ren
Summary: A novel sandwich panel structure inspired by the synclastic curvature behavior of auxetic metamaterial was proposed to improve the controllability, auxeticity, flexibility, and synclastic curvature of traditional sandwich panels. Experimental and numerical methods were used to compare the similarities and differences between the novel and traditional sandwich panels under uniaxial compression. The study also explored the auxeticity, stretchability, synclastic curvature, and potential applications of the novel sandwich panel.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Aerospace
Qinyu Li, Oscar Ainsworth, Giuliano Allegri, Jie Yuan, Fabrizio Scarpa
Summary: This study evaluates the use of adaptive wings and Kirigami technologies for morphing airframe applications. A cellular Kirigami wingbox with an adaptive hinge is designed and manufactured, and its mechanical properties are numerically evaluated. The results show the feasibility of using this concept for morphing/adaptive small to medium-scale air vehicles from a structural and aeroelastic perspective.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Cong Wang, Yi Min Xie, Zicheng Zhuang, Xuyu Zhang, Shiwei Zhou
Summary: The paper proposes an inverse homogenization method based on fast Fourier transform to extract material strength from the perspective of the von Mises yield criterion. The method represents the microstructure profile using a linear combination of cubic B-spline basis functions with repeated knots and minimizes the strength through a reaction diffusion-based B-spline level set method.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
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)
