Article
Engineering, Civil
Zhihao Zhu, Hai Fang, Huiyuan Shi, Chen Yang, Juan Han, Chen Chen
Summary: This study investigates the bending performance of a new type of composite sandwich panels with pultruded profile cores, and multiaxial glass fiber reinforced polymer (GFRP) facial sheets and webs between the profile cores. The influences of the position and number of fiber cloth layers on the bending properties of the sandwich panel are also studied. The failure modes, load-deflection behavior, and load-strain relationships are compared using four-point bending tests. The results show that wrapping multiaxial fiber cloth can change the brittle failure characteristics of the pultruded profiles, and that the multiaxial FRP surface and uniaxial pultruded profiles can operate effectively. The completely wrapped fiber cloth method improves the bending performance of the sandwich plate.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Physical
Harri Junaedi, Tabrej Khan, Tamer A. Sebaey
Summary: This study investigates the influence of glass fiber content in rigid polyurethane foam on the mechanical properties of the sandwich structure made of carbon-fiber-reinforced polymer facing sheets. Flexural and compression tests were conducted, and the morphology of the polyurethane composite foams at different contents was observed. The results show that the mechanical properties of the sandwich structure improve with increased milled fiber loading, but then decrease after reaching a maximum at 10 wt.% loading. The density of the foam also increases with higher glass fiber loading.
Article
Materials Science, Composites
Himan Khaledi, Yasser Rostamiyan
Summary: The flexural strength of carbon fiber reinforced polymer sandwich panels reinforced with a novel M-shaped lattice core and nano-SiO2 was experimentally determined. The addition of 1 to 3 wt% nano-SiO2 into carbon fibers showed the most desirable effects on enhancing flexural strength, while the use of polyurethane foam and the new M-shaped core structure also improved the performance of the sandwich panels.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Composites
Himan Khaledi, Yasser Rostamiyan
Summary: The flexural strength of a glass fiber reinforced polymer sandwich panel with a novel M-shaped lattice core reinforced by nano-silica has been experimentally determined. The study found that adding 1-3 wt% of nano-silica into the glass fiber had the most desirable effects on enhancing the flexural strength of the sandwich panels, and polyurethane foam injection also improved the strength of the panels. The new M-shaped core effectively postponed the buckling and failure of the sandwich structures.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Polymer Science
Mohammed A. Abed, Aysha Anagreh, Nikola Tosic, Ola Alkhabbaz, Majd Eddin Alshwaiki, Robert Cerny
Summary: This study evaluated the effect of different expanded clay aggregate contents on the physical-mechanical properties of LWC and tested the flexural behavior of LWC beams reinforced with steel and FRP. The results provide support for the use of innovative materials such as lightweight aggregate and FRP reinforcement.
Article
Construction & Building Technology
Hai-yang Gao, Lian-guang Wang, Bai-ling Chen, Xue Li
Summary: This paper investigates the flexural performance of GFRP-concrete-steel sandwich composite members, revealing that the GFRP tube has a restraining effect, the spliced beams degrade at a certain load, and the splicing method based on connecting rebar satisfies the load-carrying capacity requirement and exhibits ductile behavior. The steel ratio of connecting rebar and the inner steel tube diameter significantly influence the failure mode and performance.
ADVANCES IN STRUCTURAL ENGINEERING
(2022)
Article
Construction & Building Technology
Mahdi Nematzadeh, Saber Fallah-Valukolaee
Summary: The study evaluated the structural performance of two-layer fiber-reinforced concrete beams with GFRP and steel rebars under quasi-static loads. The results showed that adding fibers to different zones of the section led to different effects on ductility and ultimate flexural strength, while increasing reinforcement ratio and concrete compressive strength improved the flexural performance of the beams. Replacing steel rebars with GFRP ones decreased the load-carrying capacity, flexural stiffness, and ductility of the beams.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Hibretu Kaske Kassa, Getinet Melesse, Gashahun Yabasa
Summary: This study focuses on the flexural strengths of glass fiber-reinforced polymers, finding that the presence of glass fiber enhances the flexural strength of concrete. Furthermore, ductility and flexural strength improve with increasing fiber content.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Hibretu Kaske Kassa, Getinet Melesse, Gashahun Yabasa
Summary: This study focuses on the experimental evaluation of the flexural strengths of glass fiber-reinforced polymers with varying fiber content. It is found that increasing the glass fiber content improves both the flexural strength and ductility of concrete.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Mechanics
Chengyu Guan, Huimin Li, Zhiyong Yang, Yuyang Zhang, Daining Fang
Summary: This paper proposes a new method for fabricating carbon fiber reinforced polymer (CFRP) orthogonal lattice truss sandwich panels by inserting inner trusses into outer trusses. Three different adhesives, epoxy resin, ethylene-vinyl acetate copolymer (EVA), and nitrile butadiene rubber (NBR), are used to prepare the structures. The finite element modal strain energy method is employed to test and predict the mode shapes, natural frequencies, and loss factors of the structures. The results show that the EVA adhesive improves the loss factors of the structure while maintaining an acceptable reduction of the natural frequency.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Composites
Moyeenuddin Ahmad Sawpan, Mohammad Dalour Hossain Beg
Summary: This paper presents a comprehensive analysis of the residual thermal and mechanical properties of pultruded glass fiber reinforced polymer composite bars following a decade of conditioning in an alkaline solution and exposure to natural weather conditions. The study focuses on evaluating the changes in the glass transition temperature (T-g) of the polymer matrix and its impact on the bar's mechanical performance. The results indicate that the plasticizing effect of absorbed water leads to a decrease in T(g) and reductions in flexural modulus, flexural strength, and transverse shear strength. The weakening in the bonding between the fibers and the polymer matrix is primarily responsible for the reductions in strength and stiffness. Interestingly, the short beam shear strength remains relatively unchanged due to the slow diffusion of water into the core of the bars.
POLYMER COMPOSITES
(2023)
Article
Engineering, Civil
Junqi Huang, Qing Jiang, Xun Chong, Xianguo Ye, Caihua Liu
Summary: In this study, a novel diagonally inserted bar-type basalt fiber reinforced polymer (BFRP) connector was proposed for precast concrete sandwich panels (PCSPs). Pull-out tests and direct shear tests were conducted to evaluate the anchoring and shear performance of the connector. The results showed that the bar-type BFRP connector achieved a reliable anchorage system, offered sufficient stiffness and capacity for a partially composite PCSP, and was influenced by the boundary condition for the out-of-plane flexural performance of the investigated facade PCSP.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Rodrigo Lameiras, Joaquim A. O. Barros, Isabel B. Valente, Elisa Poletti, Matilde Azevedo, Miguel Azenha
Summary: The study developed an innovative modular system for low-rise buildings, focusing on construction rationalization and thermal efficiency. Experimental results showed that the tested prototypes were able to withstand high lateral loads.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Omar Gouda, Alireza Asadian, Khaled Galal
Summary: This study evaluates the flexural strength and serviceability performance of concrete beams reinforced with ribbed GFRP bars, and investigates the effects of different parameters on the beam performance. The results indicate that increasing the reinforcement ratio and confinement in the bending zone can improve the ultimate capacity and ductility index of the beams.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Polymer Science
Ali Farokhi Nejad, Seyed Saeid Rahimian Koloor, Syed Mohd Saiful Azwan Syed Hamzah, Mohd Yazid Yahya
Summary: This study focuses on the mechanical behaviour of through-thickness polymer, pin-reinforced foam core sandwich panels subjected to indentation and low impact loading. Results show that using polymeric pins significantly increases the flexural strength of the panel under impact loading and raises the impact resistance of the pin-reinforced foam core panel. The size of pins has a significant influence on flexural behavior while the sample is under a moderate strain rate.
Article
Engineering, Mechanical
Alexander Lopatin, Evgeny Morozov
Summary: This paper presents an analytical solution for the buckling problem of a composite cylindrical sandwich panel subjected to axial load. The study considers different boundary conditions and loading scenarios, utilizing engineering theory equations and numerical methods to derive a critical load formula. The formula is verified through finite-element analysis and demonstrates the influence of Poisson's effect on the buckling load value.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Mechanics
A. Lopatin, E. Morozov, A. Shatov
Summary: This paper considers the buckling of a biaxially compressed anisogrid stiffened composite cylindrical panel with clamped edges. The analysis is based on modeling and using the engineering theory to derive an analytical formula for the critical compressive buckling load. The results of calculations have been verified by finite-element analyses.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Mechanical
A. Lopatin, E. Morozov
Summary: This work proposes an efficient method to calculate the fundamental frequency of a corner-supported composite sandwich plate with a lumped mass at its center. The method combines the Hamilton principle and the Rayleigh-Ritz method to solve the dynamic problem of the panel. The results were successfully verified through comparisons with finite-element computations, demonstrating the efficiency of the proposed methodology.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Engineering, Civil
Caizheng Wang, Hongxu Wang, Krishna Shankar, Evgeny V. Morozov, Paul J. Hazell
Summary: The study investigated the dynamic mechanical response of steel wire mesh subjected to low-velocity impact loading using experimental and numerical methods. Factors such as impact energy, impactor's mass and size, and strength differences between weft and warp wires were found to influence the extent of damage and mechanical performance of the wire mesh specimens under different loading conditions. Experimental results revealed that peak contact force increased with impact energy until wire breakage occurred, after which the peak force remained almost unchanged.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Nicholas Sirach, Scott T. Smith, Tao Yu, Ahmed Mostafa
Summary: The study shows that FRP-confined multi-tube concrete columns exhibit excellent structural behavior under different parameters, with internal steel tubes outperforming aluminum tubes, and basalt FRP and GFRP jackets having similar effects. Increasing FRP thickness improves the ultimate strength of the column.
COMPOSITE STRUCTURES
(2022)
Article
Thermodynamics
Yee Yan Lim, Ricardo Vasquez Padilla, Andreas Unger, Rodrigo Barraza, Ahmed Mostafa Thabet, Iman Izadgoshasb
Summary: This study proposed a self-tunable piezoelectric wind energy harvester that can adapt to the erratic nature of wind in the field by using a rotating base, demonstrating higher output power especially with the use of a square prism as the bluff body under typical urban wind conditions.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Multidisciplinary
Zi Sheng Tang, Yee Yan Lim, Scott T. Smith, Ahmed Mostafa, Ah Choi Lam, Chee Kiong Soh
Summary: This study presents the first field application of electromechanical impedance (EMI) and wave propagation (WP) techniques for monitoring concrete curing, using smart aggregate (SA) sensors. The results obtained from EMI and WP techniques were consistent and comparable to destructive compression and non-destructive ultrasonic pulse velocity (UPV) tests. The study also presents semi-analytical models for quantifying the compressive strength and modulus of elasticity of concrete at different curing durations.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Construction & Building Technology
Husam Alsanat, Shanmuganathan Gunalan, Perampalam Gatheeshgar, Keerthan Poologanathan, Ahmed Mostafa Thabet
Summary: This study investigates the effect of web openings on the web crippling strength of roll-formed aluminium lipped channel (ALC) sections. It is found that the web openings can significantly reduce the strength of the sections, both in unfastened and fastened conditions. Design equations are proposed and validated, and it is recommended to incorporate them into relevant standards.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Hongxu Wang, Dakshitha Weerasinghe, Paul J. Hazell, Damith Mohotti, Evgeny V. Morozov, Juan P. Escobedo-Diaz
Summary: This study investigates the impact behavior of UHMWPE textile composites under different matrix rigidities. Experimental and numerical methods were used to analyze the mechanical properties. It was found that the composites changed from membrane stretching mode to plate bending mode as the matrix rigidity and thickness increased. The flexible matrix composites had higher perforation resistance but larger deformation compared to the rigid matrix counterparts.
DEFENCE TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Matthew J. Donough, B. Gangadhara Prusty, Mitchell J. Van Donselaar, Evgeny V. Morozov, Hongxu Wang, Paul J. Hazell, Andrew W. Philips, Nigel A. St John
Summary: This work investigated the damage in thick glass-fibre/epoxy laminates caused by low velocity impacts. Experimental and numerical results showed that the impact damage was localized in the vicinity of the impactor contact area and included an interplay of various damage mechanisms. The highest impact damage resistance was obtained with the 0 degrees (in-plane) specimen due to the alignment of fibers to the impact loading direction.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Chemistry, Analytical
Iresha Erangani Piyarathna, Yee Yan Lim, Mahesh Edla, Ahmed Mostafa Thabet, Mustafa Ucgul, Charles Lemckert
Summary: In recent years, there has been considerable interest in harvesting energy from ultralow-frequency vibrations for wearable devices and wireless sensors. Conventional linear piezoelectric energy harvesters are often inefficient for practical applications due to their narrow operating bandwidth. This study proposes a novel multimode design, the bent branched beam harvester (BBBH), which enhances the output voltage and power for ultralow-frequency applications. Experimental results show that the BBBH outperforms conventional designs, achieving higher output voltages and power with a wider operating bandwidth.
Article
Energy & Fuels
Muhammad Kamran, Mahesh Edla, Ahmed Mostafa Thabet, Abdul Haseeb, Deguchi Mikio, Vinh Bui
Summary: This study investigates a complete model for a miniature excitation-powered piezoelectric generator, as well as the modes of operation and control of a full-bridge joule thief circuit. The proposed model reveals the dependence of the generator's power on mechanical excitation, acceleration, and frequency. It also defines the load behavior for power optimization. The integrated circuit, called FBRJT, combines a conventional full-bridge rectifier with a joule thief circuit for efficient AC-DC and DC-DC conversion.
Article
Nanoscience & Nanotechnology
Jianshen Wang, Daniel East, Evgeny V. Morozov, Hongxu Wang, Paul J. Hazell, Juan P. Escobedo-Diaz
Summary: This study investigated the mechanical response, microstructures, and failure mechanisms of additively manufactured Ti matrix composites with Ti2Ni and TiCx reinforcements under various loading rates. The results showed that the mechanical properties of the composites changed with the NCG fraction. The failure mechanisms involved tensile fracture of TiCx precipitates and shear of the Ti matrix. Composites with higher NCG content exhibited increased strength, reduced ductility, and lower strain rate sensitivity. The Ti-Ni-C composite showed enhanced strength without compromising ductility under high strain rate compression loading, making it a promising material for impact load applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Proceedings Paper
Engineering, Mechanical
A. Mostafa, D. G. S. Sanchez, N. Sirach, R. Padilla, H. Alsanat
Summary: Polyethylene is a widely used semi-crystalline polymer in various industrial applications, and understanding its mechanical behavior under different loading scenarios is crucial for its long-term performance. This study investigated the creep behavior of high-density polyethylene and ultra-high molecular weight polyethylene through experimental testing, analytical analysis, and numerical modeling. The results showed good agreement between the experimental, analytical, and numerical methods, indicating the potential use of finite element models to predict the serviceability of polyethylene products under prolonged exposure to constant loading conditions.
PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON NUMERICAL MODELLING IN ENGINEERING: NUMERICAL MODELLING IN MECHANICAL AND MATERIALS ENGINEERING, VOL 2, NME 2021
(2022)
Proceedings Paper
Engineering, Mechanical
Mohammad Ashraful Karim Chowdhury, M. Krid, Ahnaf Akif, A. Mostafa
Summary: This research focuses on developing deadlock prevention policies for AMS using structural analysis and reachability graph analysis, aiming to improve system performance and resource utilization.
PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON NUMERICAL MODELLING IN ENGINEERING: NUMERICAL MODELLING IN MECHANICAL AND MATERIALS ENGINEERING, VOL 2, NME 2021
(2022)
