Article
Engineering, Civil
Yading Xu, Branko Savija
Summary: This work proposes a 3D auxetic cementitious-polymeric composite structure (3D-ACPC) that combines 3D printed polymeric shell with cementitious mortar. Experimental results show that the 3D-ACPC has the ability to overcome the brittleness of conventional cementitious material and the low compressive strength of 3D printed polymeric cellular shell, exhibiting compressive strain-hardening behavior and high energy absorption ability. The 3D-ACPC also shows significantly enhanced specific energy absorption compared to conventional cementitious materials and polymeric cellular materials.
ENGINEERING STRUCTURES
(2023)
Article
Chemistry, Physical
Xinran Zhou, Kaushik Parida, Jian Chen, Jiaqing Xiong, Zihao Zhou, Feng Jiang, Yangyang Xin, Shlomo Magdassi, Pooi See Lee
Summary: The fast development of wearable electronic systems requires a sustainable energy source. Piezoelectric polymer films are a perfect candidate for fabricating nanogenerators, but most of their applications are limited to the pressing mode energy harvesting. In this work, an auxetic structure is 3D printed on a polymer film-based PENG, enabling the bending deformation of the PENG to be transformed into controlled in-plane stretching deformation, increasing the bending output voltage by 8.3 times. The auxetic structure-assisted PENG is also demonstrated as a sensor for bending angle and motion monitoring.
ADVANCED ENERGY MATERIALS
(2023)
Article
Engineering, Civil
Yiyi Zhou, Yunfan Li, Dan Jiang, Yu Chen, Yi Min Xie, Liang-Jiu Jia
Summary: In this study, drop hammer impact tests and finite element analyses were conducted to investigate the dynamic responses of metallic auxetic honeycombs. The results showed that the auxetic honeycomb specimens had better energy absorption performance, leading to significantly improved energy absorption efficiency.
ENGINEERING STRUCTURES
(2022)
Article
Instruments & Instrumentation
Yuheng Liu, Ming Lei, Linlong Peng, Haibao Lu, Dong-Wei Shu
Summary: This study designs a 3D printed auxetic structure that achieves a tunable out-of-plane double hyperbolic buckling behavior by varying stiffness across thickness. The influences of radius and draft angle on the buckling behaviors are studied, and the constitutive relationships between stress, strain, radius, and draft angle are discussed. The accuracy of the analytical results is verified by experiment.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Jingda Tang, Qianfeng Yin, Mengting Shi, Meng Yang, Hang Yang, Bonan Sun, Baolin Guo, Tiejun Wang
Summary: The recent development of soft magnetic nanocomposites has enabled the programmable shape transformation of magnetic robots, which shows promise for various biomedical applications. By fabricating composite structures of magnetic hydrogels and elastomers using extrusion-based 3D printing, researchers have demonstrated the potential for complex shape transformation and targeted cancer cell killing through magnetic hyperthermia. This approach may open up new opportunities for applications in medicine and bioengineering.
EXTREME MECHANICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Lung Chow, Kit-lun Yick, Kam Ho Wong, Matthew Sin-hang Leung, Yue Sun, Mei-ying Kwan, Karolyn Ning, Annie Yu, Joanne Yip, Ying-fan Chan, Sun-pui Ng
Summary: This study proposes the use of 3D printed materials with an auxetic architecture to improve pressure therapy. The results of experiments and numerical calculations demonstrate the stability and pressure adaptability of the auxetic structures under out-of-plane bending, indicating that this design can promote the recovery of HS.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Lianchao Wang, Xiaojun Tan, Shaowei Zhu, Bing Wang, Shuai Li, Yajun Zou, Shuai Chen
Summary: An enhanced double-elliptic-ring (EDER) structure with strain-dependent auxeticity is introduced based on double-elliptic-ring (DER) partial auxetic structures. The EDERs exhibit directional instability under compression, enhancing their auxetic behaviors. By varying the geometric parameters of the enhanced structure (ES) of the EDERs, their deformation can be programmed to display varying localized deformation mechanisms.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Instruments & Instrumentation
Amer Alomarah, Zahraa A. Al-Ibraheemi, Dong Ruan
Summary: This study proposes an auxetic stent called RCA, which has controllable auxetic features by adjusting geometric parameters and the number of unit cells. The experimental and numerical results show that the RCA stents have remarkable radial expansion capabilities and exhibit different deformation patterns.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Lei Ren, Wenzheng Wu, Luquan Ren, Zhengyi Song, Qingping Liu, Bingqian Li, Qian Wu, Xueli Zhou
Summary: In this study, a new mechanical metamaterial with programmable mechanical properties was prepared using the high-performance polymer PEEK as the printing material. By combining structural design with the shape memory properties of PEEK, reconfigurable metamaterial structure and properties were achieved.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Xiaoyang Zheng, Xiaofeng Guo, Ikumu Watanabe
Summary: This study introduces a new 3D auxetic metamaterial generated from an implicit expression, fabricated using 3D printing, and enhanced with a nickel layer for improved performance. Evaluation of the metamaterial's performance through compression tests and finite element analyses, along with contour maps for guidance in functional applications, were presented. Integration of 3D printing and electroless plating allowed accurate control over the mechanical and conduction properties of the material.
MATERIALS & DESIGN
(2021)
Article
Engineering, Mechanical
Anis Hamrouni, Jean-Luc Rebiere, Abderrahim El Mahi, Moez Beyaoui, Mohamed Haddar
Summary: This study investigates the static properties of architectural cores and the dynamic behavior of sandwich structures using an auxetic or non-auxetic core through experimental and numerical analyses. Three types of architectural cores, including re-entrant, rectangular, and hexagonal honeycombs, were studied with varying densities. Tensile tests were conducted to analyze the influence of core topology and density on Poisson's ratio and Young's modulus. Vibration tests were then performed to study the impact of these structures and their densities on the dynamic properties of sandwiches. The results demonstrate a sensitive behavior of the structural Poisson's ratio to core topology and density.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
Article
Engineering, Biomedical
Arun Arjunan, Suhaib Zahid, Ahmad Baroutaji, John Robinson
Summary: The COVID-19 pandemic has led to global shortages of nasopharyngeal swabs, prompting researchers to develop 3D printed swabs to reduce patient discomfort.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yutai Su, Xin Wu, Jing Shi
Summary: A multimaterial strategy combined with structure innovation is adopted to enhance structural stiffness while retaining the auxetic behavior for auxetic metamaterials. A bimaterial reentrant structure with additional soft arch-like beams and hinges is proposed and investigated using experimental and simulation approaches. The results demonstrate that reducing the strength of the hinge significantly reduces the buckling issue of the beam/wall and minimizes the reduction of auxetic behavior due to increased stiffness. Thus, the strategy to enhance design flexibility for auxetic metamaterials is verified.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Polymer Science
Doron Kam, Ido Levin, Yinnon Kutner, Omri Lanciano, Eran Sharon, Oded Shoseyov, Shlomo Magdassi
Summary: This article presents an investigation on wood warped objects fabricated by 3D printing. The printing pathway and flow rate can be predesigned to control the resulting structure after drying. By carefully tuning the flow rate and printing pathway, the morphology of the fully dried wooden objects can be controlled.
Article
Instruments & Instrumentation
Zhenghong Li, Yuheng Liu, Haibao Lu, Dong-Wei Shu
Summary: This study achieves bidirectional hyperbolic out-of-plane deformation and auxetic behavior of thin plates under uniaxial compression by tuning the parameters of horseshoe structures.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Parag Pathak, Nitesh Arora, Stephan Rudykh
Summary: The study investigates the microscopic and macroscopic instabilities in magnetoactive elastomer composites under an external magnetic field, finding that layered MAEs can develop additional antisymmetric microscopic instability and the wavelength of buckling patterns can be highly tunable by the applied magnetic field. This material ability provides the potential for designing materials with reconfigurable microstructures for various applications.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Jian Li, Mrityunjay Kothari, S. Chockalingam, Thomas Henzel, Qiuting Zhang, Xuanhe Li, Jing Yan, Tal Cohen
Summary: This paper highlights the significant contribution of J.D. Eshelby to the study of mechanical behavior of materials, discussing the theoretical foundation of elastic stress and strain fields as well as their application in material deformation and reorganization processes. Experimental observations of key morphogenesis steps in biofilm growth are used to obtain approximate equilibrium solutions through two different methods, shedding light on the natural growth paths under confinement conditions.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Chemistry, Physical
Jian Li, Viacheslav Slesarenko, Stephan Rudykh
Summary: The study discovered that in the unexplored field of soft heterogeneous composites, a non-dilute stiff phase can lead to the formation of instability-driven domains that are energetically favorable over wrinkling. By introducing a closed-form analytical expression to predict the evolution of the patterns and altering material compositions, various patterns can be pre-designed.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Mechanics
Nitesh Arora, Jian Li, Stephan Rudykh
Summary: The buckling behavior of soft 3D-fiber composites with varying microstructure periodicity is studied. The orientation of out-of-plane buckling is determined by material properties, volume fractions, and periodicity. A buckling configuration map is provided in the design-space, predicting that these instability patterns will enrich the design of deformation-controlled tunable materials.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Vincent W. Chen, Nitesh Arora, Artemii Goshkoderia, Carson L. Willey, Zafer Turgut, Philip R. Buskohl, Stephan Rudykh, Abigail T. Juhl
Summary: Magnetorheological elastomers (MRE) have the ability to change shape and properties under the influence of an external magnetic field. This study investigates the buckling behavior of a composite system consisting of a magnetoactive layer embedded into an inactive elastomeric matrix. The critical buckling strain is highly tunable by the applied magnetic field and the composite exhibits well-developed controllable wavy patterns in the post-buckling regime.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Civil
Jialin Li, Guangjun Gao, Yao Yu, Jian Li
Summary: This study presents a three-dimensional scaled similitude rule for train collision and verifies it through establishing a simulation model. By multiplying the scale factors, the dynamic responses of the scaled model are identical to that of the full-scale model. This rule can guide scaled model tests in laboratory.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2023)
Article
Engineering, Civil
Jian Li, Zihao Xie, Yao Yu, Xiaobo Gong, Guangjun Gao
Summary: In this paper, a new hybrid absorber is proposed to address the limited energy absorption capability of splitting tube. Experimental results show that the hybrid tube significantly improves the crushing force and is well validated by finite element simulations.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Yuhai Xiang, Dean Chen, Nitesh Arora, Qi Yao, Stephan Rudykh
Summary: This study investigates the relationship between viscoelasticity and instabilities in soft particulate composites undergoing finite deformation. The composite experiences microstructural buckling upon exceeding the critical strain level, and the critical strain and wavelength depend on the applied strain rate. Different buckling patterns can be activated by changing strain rates, and the space of admissible buckling modes widens in composites with higher instantaneous shear modulus. Experimental results validate the ability of the numerical model to predict critical buckling characteristics.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jian Li, Hannah Varner, Tal Cohen
Summary: The necking instability is a precursor to tensile failure and rupture of materials. It can exhibit periodic necking and fragmentation when confined to a substrate or embedded in a matrix. Necking in hyperelastic materials is not well understood, but there has been a renewed interest in its role for the advancement of fabrication processes and to explain fragmentation phenomena.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Mechanics
Mohammad Rauf Sheikhi, Selim Guergen, Jian Li, Mehmet Alper Sofuoglu, Mahdi Hasanzadeh, Melih Cemal Kushan, Zhenmao Chen
Summary: This study explores a new concept of integrating multi-functional shear thickening fluids (M-STFs) into sandwich structures to enhance vibration damping. The results show that gradually adding multi-walled carbon nanotubes (MWCNTs) to the fluid significantly improves its electrical resistance and rheological properties. Furthermore, the integration of M-STFs into the sandwich structures effectively increases the damping ratio and stiffness coefficient.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Yao Yu, Xiaobo Gong, Jialin Li, Guangjun Gao, Jian Li
Summary: This paper presents a novel multi-cell tube energy absorption structure made of aluminum alloy for ultra-large energy absorption field. The proposed structure has the advantages of low cost, large size, light weight, high energy absorption capacity, and large crushing force. Experimental and simulation results demonstrate its feasibility and superior performance. This structure can be applied to ultra-large energy absorption fields such as train crashworthiness protection.
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)
