Article
Polymer Science
James A. Quinn, James R. Davidson, Ankur Bajpai, Conchur M. O. Bradaigh, Edward D. McCarthy
Summary: This investigation focuses on the inspection capabilities of in-field advanced ultrasound detection for ultra-thick glass fibre-reinforced polyester composites. Delamination flaws were created at calibrated depths using custom moulding techniques. The study utilized the full matrix capture technique with an on-board total focusing method and a 0.5 MHz linear array probe to detect flaws. The results demonstrate an inverse relationship between the ability to find delaminations and plate thicknesses, with successful inspections up to 74 mm.
Article
Materials Science, Characterization & Testing
Jagadeeshwar Tabjula, Srijith Kanakambaran, Prabhu Rajagopal, Balaji Srinivasan
Summary: Ultrasonic wave visualization is an effective tool for defect identification in guided wave structural health monitoring applications. This paper explores sparse sampling techniques, including random sampling with biharmonic interpolation and uniform sampling with carrier multiplication. The proposed techniques achieve high image sparsity and low sensor density, and are validated through experiments. The visualization of ultrasonic wave propagation using a surface-bonded fiber Bragg grating sensor is also demonstrated.
NDT & E INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Yaguang Yang, Xia Liao, Cuifang Lv, Bo Wang, Fangfang Zou, Guangxian Li
Summary: A combination of mechanical mixing and supercritical carbon dioxide foaming was used to prepare ultralightweight polymer microcellular foam. The addition of water and ultrasound enhanced the polymer foaming behavior, resulting in a significantly increased foam expansion ratio. The prepared foams exhibited an expansion ratio of 79 and a low thermal conductivity of 26.79 mW/mK. Ultrasound affected both the saturation and release stages of foaming, with a more pronounced effect observed in the release stage. This study presents a novel, facile, versatile, and green approach for preparing microcellular polymers with ultralightweight and superior thermal insulation.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Davinder Kumar, Dilbag Singh, S. K. Tomar
Summary: Rayleigh-type waves in a layered model composed of thermoelastic medium with a double porosity structure are investigated, with a dispersion relation obtained under appropriate boundary conditions. The presence of thermal effects, pores, and layer thickness are found to affect the phase speed and attenuation coefficient of Rayleigh-type waves. Both new and previously known results are derived from the formulation, with graphical representations of displacements and stresses generated by the fundamental mode.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Mingqing Liu, Qinyu Gan
Summary: This paper systematically studies the dynamic response of a layered medium under an impact load through model tests and analyzes the effects of various factors on dynamic stress propagation and attenuation. The study found that Sadovsky's empirical formula fits well with the attenuation law of vertical peak velocity.
Article
Geosciences, Multidisciplinary
Yangfan Deng, Joseph S. Byrnes, Maximiliano Bezada
Summary: Teleseismic body-wave attenuation serves as an independent constraint on the lithosphere-asthenosphere system, with the first map of teleseismic attenuation across South China revealing correlations with lithospheric thickness. Variation in attenuation, from weakest in the Sichuan Basin to strongest near the Hainan plume, suggests a complex interplay of lithospheric structures and thermal conditions in the region.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Multidisciplinary
Maedeh Ranjbar, Leo Skec, Gordan Jelenic, Dragan Ribaric
Summary: In this work, a finite-element formulation for modeling mixed-mode delamination in layered structures is presented and compared to a more common linear interpolation approach. The proposed approach improves the convergence and robustness of the solution by using quadratic linked interpolation for vertical displacements and transversal relative displacements of the beam elements, while using linear Lagrange interpolation for axial displacements and cross-sectional rotations. Additionally, a bilinear cohesive zone model is embedded for delamination modes I and II. However, this formulation shows a peculiar behavior with spurious oscillations in mode-I and mixed-mode tests for composites with stiff adhesives, which can be solved by canceling the quadratic term in the interpolation function and using standard Lagrange interpolation.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Alysson F. Morais, Dimy Nanclares, Ivan G. N. Silva, Alfredo Duarte, Fernando A. Garcia, Eric Breynaert, Danilo Mustafa
Summary: Synthesis of layered materials with hierarchical porosity remains challenging, but using a soft-templating strategy and introducing Eu3+ has been shown to result in the self-assembly of layered nanotubes with multilayer cylinders, greatly increasing the specific surface area of the materials.
Article
Chemistry, Physical
Samuel Leumas Otoo, Dihua Yu, Youlei Wu, Wei Chen, Changfu Deng, Qiu Li, Song Li
Summary: By adding baryte, bismuth oxide, and lead concentrate to cement grout, the radiation attenuation characteristics of the grout can be modified, enhancing the visibility of voids in the grout and improving detection and evaluation.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Pengcheng Cui, Silong Wu, Jun Xie, Jiaying Ma, Lingyun Ding, Oluseyi S. Olasoju, Yongjian Cao, Yaqi Li, Liyan Shen, Wei Sun
Summary: Asymmetric multi-layered porous films were prepared using the inverse emulsion casting method, allowing for dynamic manipulation of porous morphologies by adjusting emulsion composition and environmental conditions. The model drug was efficiently loaded into the porous film during fabrication, resulting in sustained drug release for over 28 days.
CHEMICAL COMMUNICATIONS
(2021)
Article
Mechanics
Chandani Kumari, Santimoy Kundu, Manisha Maity, Shishir Gupta
Summary: This study investigates the mechanical and electrical characteristics of Love waves in a visco-piezo-composite medium. The results show that the piezo-electric parameter has a significant positive impact on the phase velocity and attenuation coefficient. The findings have potential applications in various fields such as automatic remote control, space exploration, and piezoelectric ceramic devices.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Environmental
Bingying Jia, Bang Xu, Liujie Bing, Jihong Sun, Shiyang Bai
Summary: With the assistance of CTAB, the delamination of disorderly layered CP was achieved, leading to the formation of disordered CP nanosheets. The delaminated CPs showed potential in gas adsorption and separation applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Marine
Zhongjian Ling, Yifan Li, Yongou Zhang
Summary: In this study, the Bragg resonant reflection of linear and nonlinear water waves over classical Bragg structures is numerically investigated, using the Smoothed Particle Hydrodynamics (SPH) method. The sensitivity of particle spacing and transmission coefficient is analyzed, and it is found that the Bragg resonant reflection occurs when the wavelength is about double of the spacing. Phase upshift is observed in both linear and nonlinear water waves, with the minimum transmission coefficient appearing when 2L/lambda > 1.0. Furthermore, the transmitted wave height is significantly reduced in resonant cases with three or more floating structures. These findings provide insights for wave attenuation design in floating periodic structures based on the Bragg rules.
Article
Chemistry, Inorganic & Nuclear
Luofu Min, Jingying Duan, Chuan Song, Yanan Chen, Wen Zhang, Yuxin Wang
Summary: A new and easy method is developed to remove CO32- anions from LDHs and substitute them with other desired anions. The method involves immersing LDH-CO3 in a carbonated NaCl solution, which reacts with CO32- to form bicarbonate and allows easy substitution with chloride ions.
DALTON TRANSACTIONS
(2023)
Article
Polymer Science
Tucker J. McKenzie, Soren Smail, Kathryn Rost, Kabir Rishi, Gregory Beaucage, Neil Ayres
Summary: This study successfully synthesized PDMS-based polymerized high internal phase emulsions with gradient porosity structure using one-step reactions. By adjusting the volume of aqueous phase, the total porosity, pore size, and surface area can be controlled, and the layered porosity structure exhibits mechanical strength.
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)