Article
Materials Science, Multidisciplinary
Mao Yang, Bin Han, Pengbo Su, Feihao Li, Zhongnan Zhao, Qi Zhang, Qiancheng Zhang, Zhenjun Hong, Tian Jian Lu
Summary: Through experimental and numerical analysis, it was found that metallic truncated conical sandwich shells with corrugated cores exhibit higher energy absorption and lower peak force under oblique compression, especially when the semi-apical angle is set around 10 degrees to 15 degrees. These results provide valuable guidance for the application of truncated conical sandwich tubes in protective engineering.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Mechanical
Xin-liang Dong, Fan Zhou, Wen-chun Jiang, Yu-tong Xie, Yi-peng Zhang, Xue-fang Xie, Xiang-nan Zhai, Chang-cun Lu, Guo-hua Li, Xiu-hui Jiang
Summary: This study focused on the failure analysis of conical gaskets in ultra-high pressure pipeline sealing devices. Through experiments and numerical simulations, it was found that the mechanical properties of used gaskets degenerate and microstructural changes occur, leading to the loss of elastic resilience and seal failure.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Marine
Chunyu Zhang, Guoyong Jin, Zhihao Wang, Yao Sun
Summary: The dynamic stiffness method (DSM) is proposed to investigate the vibration characteristics of coupled conical-ribbed cylindrical-conical shell structures. The method divides the structure into components and formulates a dynamic stiffness matrix based on the relationships between displacements and forces. Experimental validation and numerical examples demonstrate the accuracy and stability of the method, providing insights into the effects of geometric parameters on dynamic behaviors.
Article
Mechanics
Seyed Sajad Mirjavadi, Masoud Forsat, Mohammad Reza Barati, A. M. S. Hamouda
Summary: This research examines the nonlinear free vibration behavior of truncated conical shell segments made from multi-scale epoxy/carbon nanotube/fiberglass material. A 3D Mori-Tanaka micro-mechanic method is used to define the hybrid material properties by incorporating random dispersion of carbon nanotubes and parallel alignment of glass fibers. The study focuses on the effects of fiber volume, fiber directions, semi-vertex angle, CNT weight fraction, and CNT aspect ratio on the nonlinear free vibrations of the multi-scale truncated conical shell segments.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Jianbo Tang, Jun Wang, Gang Zhao, Shuxin Li, Shiqing Xin, Jian Xu
Summary: A novel filament winding virtual tool is proposed to develop 3D winding paths using semi-geodesic and constant-wall-thickness trajectories. Tow overlaps processing method and outer-contour expanding algorithm are developed to eliminate tow interference. Experimental results demonstrate that the virtual tool can generate stable winding paths with advantages in preserving tow path and preventing tow slippage.
COMPOSITE STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Xiao Li, Xuanling Zhang, Zhihong Zhou
Summary: This paper investigates the free vibration characteristics of a spinning composite laminated truncated conical shell under hygrothermal conditions. The research findings indicate that the Coriolis force asymmetrically affects the natural frequencies of forward and backward traveling waves, while the centrifugal force symmetrically enhances the frequencies of both traveling waves. Initial hoop tension plays a significant role in increasing the critical spinning angular speed. Temperature, moisture concentration, and design parameters have a significant influence on the free vibration characteristics of the conical shell, and thermal expansion deformation cannot be neglected in the analysis of free vibration.
Article
Engineering, Environmental
Jiamin Wang, Peng Zhang, Mohua Bu, Zhaolong Luan, Shouguang Wang
Summary: In this study, a numerical model was established to investigate the effect of high temperature on the mechanical performance of granite. The results showed that granite mainly suffered heat damage in the form of tensile cracks. With the increase in temperature, the degree of fracture in granite increased, exhibiting a post-peak decrease in brittleness and an increase in ductility. When the heating temperature exceeded 450°C, thermal damage began to dominate the failure mode of granite.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Mechanical
Mingkai Wu, Jiulin Wu, Jixing Che, Ruiqi Gao, Xuedong Chen, Xiaoqing Li, Lizhan Zeng, Wei Jiang
Summary: The paper proposes a novel compact magnetic spring with high linear negative stiffness (CMS-HLNS) to improve the isolation performance of vibration isolators. The CMS-HLNS consists of two sets of permanent magnets arranged alternately, which has both high linearity and high negative stiffness properties. A simplified analytical stiffness model is derived based on the magnetic charge method, and the effects of design parameters on the stiffness characteristics are investigated. Experimental prototypes are constructed to verify the feasibility of the analytical model and demonstrate the superior vibration isolation performance of the CMS-HLNS under large amplitude excitations.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Computer Science, Interdisciplinary Applications
Luc Devroye
Summary: This paper presents a uniformly efficient and simple random variate generator for the truncated negative gamma distribution restricted to any interval. (C) 2020 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)
Article
Nanoscience & Nanotechnology
Faraz Kiarasi, Masoud Babaei, Somayeh Mollaei, Mokhtar Mohammadi, Kamran Asemi
Summary: This paper investigates the natural frequency analysis of functionally graded porous joined truncated conical-cylindrical shell reinforced by graphene platelet. The study uses a graded finite element method to solve elasticity equations and conducts a parametric study to show the effects of various factors on the structure's natural frequencies and mode shapes.
ADVANCES IN NANO RESEARCH
(2021)
Article
Mathematics, Applied
Shaowu Yang, Yuxin Hao, Wei Zhang, Li Yang, Lingtao Liu
Summary: In this study, a nonlinear dynamic model for a conical shell truncated by a functionally graded graphene platelet-reinforced composite (FG-GPLRC) is established using the first-order shear deformation theory (FSDT). Vibration analyses of the FG-GPLRC truncated conical shell are presented, and the effects of weight fraction, distribution pattern, length-to-radius ratio, and radius-to-thickness ratio on the nonlinear natural frequency characteristics are discussed. The study culminates in the discovery of periodic motion and chaotic motion of the FG-GPLRC truncated conical shell.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Materials Science, Multidisciplinary
Meysam Alinejad, Saeed Jafari Mehrabadi, Mohammad Mehdi Najafizadeh
Summary: This study analyzed the effects of magnetic field, porosity, and geometry on the natural frequency and loss factor of a conical shell made of smart porous materials. The study found that increasing the length, radius, and thickness ratios led to a decline in the natural frequency, while the loss factor and porosity coefficients increased.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
K. Avramov, B. Uspensky
Summary: This paper studies the self-sustained vibrations of a sandwich conical shell with a flexible honeycomb core manufactured by fused deposition modeling. The interaction between the sandwich thin-walled structure and supersonic gas flow is analyzed. Geometrical nonlinearity and higher-order shear deformation theory are taken into account to predict the self-sustained vibrations. Numerical analysis shows that the amplitudes of quasi-periodic and chaotic vibrations are significantly larger than the amplitudes of periodic vibrations for this shell.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
S. W. Yang, Z. Q. Wang, Y. X. Hao, W. Zhang, L. T. Liu, W. S. Ma, G. Kai
Summary: This paper examines the static bending and buckling behavior of the simply supported truncated sandwich conical shell with variable thickness core, considering various styles of porosity distribution schemes for the porous foam core.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(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
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)