Article
Materials Science, Multidisciplinary
Shi-Lian Sun, Xue-Yang Zhang, Xian-Fang Li
Summary: This paper presents a consistent shear beam theory for a thickness-wise functionally graded (FG) beam, which ensures the warping of the cross-section with vanishing shear stress on the surfaces and maximal shear strain/stress at the physical neutral plane. The governing equation of the free vibration of FG beams is derived, and the characteristic equations are obtained exactly for typical end conditions. The effects of the exponential gradient of material properties on the natural frequencies are elucidated through numerical calculations and comparison with existing solutions.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Ahmad Reshad Noori, Timucin Alp Aslan, Beytullah Temel
Summary: This study introduces an efficient numerical method to solve the dynamic responses of functionally graded porous beams, considering non-uniform distributions of elastic modulus and mass density, material constitutive law of open-cell metal foam, and the influence of damping. The canonical equations of motion for FGP beams are derived for the first time and solved numerically using the Complementary Functions Method, with results transformed back to the time domain. The influence of porosity constants, symmetric and asymmetric porosity distributions, and damping ratios on the dynamic response of FG porous beams is examined through detailed parametric studies.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Linh T. M. Phi, Tan -Tien Nguyen, Jaehong Lee
Summary: This study investigates the free vibration of thin-walled beams with functionally graded materials (FGMs) and analyzes the natural frequencies and vibrational modes under different material distributions. The proposed theory is validated through numerical comparison with existing literature results, and the effects of gradual law and volume fraction of ceramic on natural frequencies are also examined.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Ufuk Gul, Metin Aydogdu
Summary: In this study, free vibration analysis of functionally graded periodic structure nanobeams is conducted using doublet mechanics theory. The analysis provides a more accurate and physical understanding of nanostructures through a bottom-up approach, with the vibration problem solved using the Ritz method. Adjusting the material's softening and hardening responses allows for beneficial optimization and design of nanostructures.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Tao Liu, Weige Liang, Qingshan Wang, Bin Qin, Chenchen Guo, Ailun Wang
Summary: In this study, the random vibration characteristics of functionally graded porous curved beams with elastically restrained ends were investigated using the Timoshenko beam theory and spectral-Chebyshev method. The proposed model accurately calculated the stationary and non-stationary random vibration responses of the curved beams under different boundary conditions.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Ali Alnujaie, Seref D. Akbas, Mohamed A. Eltaher, Amr E. Assie
Summary: This article presents the study on damped forced vibration of layered functionally graded thick beams with material porosities, using a two-dimensional plane continuum model to simulate the dynamic response of beams. The research results show that porosity distribution, stacking sequence, and damping ratio have significant effects on the dynamic responses of layered functionally graded porous thick beams, and the proposed model can be applied in nuclear, marine, and aerospace technologies.
SMART STRUCTURES AND SYSTEMS
(2021)
Article
Engineering, Mechanical
Ye Tang, Tao Wang, Zhi-Sai Ma, Tianzhi Yang
Summary: A novel magneto-electro-elastic model of bi-directional functionally graded materials beams is developed to investigate nonlinear dynamics, showing that asymmetric modes induced by 2D FGMs significantly impact nonlinear responses. The influences of material distributions, length-thickness ratio, electric voltage, magnetic potential, and boundary conditions on nonlinear resonant frequency and response amplitude are discussed, highlighting the potential for accurate design of multi-ferroic composite structures through adjustments in material properties.
NONLINEAR DYNAMICS
(2021)
Article
Acoustics
Ma'en S. Sari, Sameer Al-Dahidi
Summary: This study investigates the natural vibration behavior of functionally graded nonuniform multiple beams based on the Euler-Bernoulli beam theory. The Chebyshev spectral collocation method is used to obtain the transverse frequencies and analyze the influence of different factors on the frequencies. Numerical examples are presented to analyze the system and verify the accuracy of the results.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Mechanics
Tan-Tien Nguyen, Ngoc-Linh Nguyen, Jaehong Lee, Quoc-Hung Nguyen
Summary: The paper introduces an analysis of thin-walled functionally graded straight and curved beams for general non-uniform polygonal cross-sections in vibration problems, utilizing a higher order beam theory and beam frame modal approach. The study considers the effects of geometric parameters and material anisotropy, enabling analytical modeling for further extension, with numerical verification and examples based on benchmark problems and finite element software simulation. The analysis can be applied to general closed cross-section beams with arbitrary curvatures, with materials properties assumed to be graded across the wall thickness following a predefined shape function.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Dongying Liu, Da Chen, Jie Yang, Sritawat Kitipornchai
Summary: This paper investigates the buckling and free vibration analyses of axially functionally graded graphene reinforced nanocomposite beams, using different distribution patterns of GPLs and conducting a comprehensive parametric study. The analysis is based on theoretical derivations and model solutions, providing results consistent with existing solutions.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Mechanical
Xian Guo, Gang Pu, Dingguo Zhang, Liang Li
Summary: This paper studies the effects of the neutral axis position and setting position on the nonlinear dynamic characteristics of a rotating hub-functionally graded materials beam. Three models are established and the nonlinear rigid-flexible coupling term is considered. Results show that the neutral axis and setting position significantly affect the dynamic behavior of the beam system with large overall motion.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Civil
O. Kirlangic, S. D. Akbas
Summary: This paper investigates the free and damped forced vibrations of layered and functionally graded composite beams using Timoshenko beam theory and the Ritz method. The effects of material distribution parameter and dynamic parameters on the natural frequencies and forced vibration responses are analyzed and compared in numerical examples.Validation of the formulations is also conducted through comparison studies.
SMART STRUCTURES AND SYSTEMS
(2021)
Article
Engineering, Civil
Da Chen, Shahed Rezaei, Philipp L. Rosendahl, Bai-Xiang Xu, Jens Schneider
Summary: This paper combines finite element homogenisation and structural assessments to conduct multiscale modelling of laminated functionally graded porous beams made of closed-cell foams. The study focuses on the beam buckling and vibration performances. The results show that the relative density is the dominating factor in calculating the foam modulus, and quantitative relations between pore structure and Young's modulus are obtained. The graded porosities in the FG beams contribute to significant increases in beam stiffness.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Timucin Alp Aslan, Ahmad Reshad Noori, Beytullah Temel
Summary: In this research, a powerful numerical method is used to analyze the free vibration of functionally graded sandwich beams with variable cross-section. The effect of shear strain is considered and the governing equations are derived using the first-order shear deformation theory. The Complementary Functions Method is implemented for numerical solution. The presented method is validated and parametric studies are conducted to investigate the influence of various factors on the natural frequencies of the beams.
Article
Construction & Building Technology
Fethi Mouaici, Abed Bouadi, Mohamed Bendaida, Kada Draiche, Abdelmoumen Anis Bousahla, Fouad Bourada, Abdelouahed Tounsi, Mofareh Hassan Ghazwani, Ali Alnujaie
Summary: This paper develops an accurate kinematic model to study the mechanical response of functionally graded sandwich beams, covering bending, buckling, and free vibration problems. The model uses a new refined shear deformation beam theory and provides good accuracy, considering a nonlinear transverse shear deformation shape function. The numerical computations using the model are compared with other beam theories to confirm its performance and verify the accuracy of the kinematic model.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Shaoyu Zhao, Yingyan Zhang, Yihe Zhang, Wei Zhang, Jie Yang, Sritawat Kitipornchai
Summary: This paper proposes a data-driven modeling approach to accurately predict the mechanical properties of graphene-reinforced nanocomposites with vacancy defects. The developed micromechanics models based on molecular dynamics (MD) databases and genetic programming (GP) algorithm provide efficient predictions of thermo-elastic properties with high coefficients of determination. The models are also applied in analyzing the structural behaviors of defective graphene reinforced composite beams.
ENGINEERING WITH COMPUTERS
(2023)
Article
Materials Science, Multidisciplinary
Lulu Liu, Zixiang Zhang, Airong Liu, Jie Yang
Summary: This study investigates the out-of-plane buckling behavior of functionally graded porous I-shaped circular arches with graphene platelets reinforcements under a uniform temperature field. The expressions for prebuckling internal forces caused by thermal expansion are derived accurately. The theoretical buckling temperature difference is obtained using the Ritz technique and is validated by finite element analysis. The influence of graphene platelets weight fraction, porosity coefficient, and porosity distribution patterns on buckling temperature difference is thoroughly examined.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Physical
Yucheng Fan, Ziyan Hang, Huanxun Liu, Chuang Feng, Jie Yang, Yu Su, George J. Weng
Summary: The incorporation of room temperature ionic liquids (ILs) into dielectric elastomer composites is of great interest due to their potential applications. This study develops a micromechanical model with an electric double layer (EDL) to predict the electrical properties of IL enhanced soft composites (ILESCs) and reveals the physical mechanisms behind the phenomena. The results show good agreement with experimental data and provide insights for optimizing ILESCs with high dielectric constants and frequency-dependent stability.
Article
Engineering, Civil
Yixiao Zhang, Airong Liu, Yonghui Huang, Jie Yang, Jiyang Fu, Yuguo Yu, Xinbing Zeng
Summary: This study experimentally investigated the mechanical characteristics of high-strength concrete-filled-steel-tubular (HS-CFST) arches and developed finite element models to predict their bearing capacity. The results showed that the ultimate bearing capacity, confinement effect, and ductility of the arch were closely related to the strength of the steel and core concrete.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Aerospace
Jun Liu, Yingyan Zhang, Yihe Zhang, Sritawat Kitipornchai, Jie Yang
Summary: This study comprehensively investigates the functionally graded graphene reinforced aluminium cantilever rectangular plates under aerodynamic loads through the coupling of finite element analysis and computational fluid dynamics. The results show that the maximum stress of the plate can be efficiently reduced and satisfactory aerodynamic performance can be achieved through aeroelastic tailoring, depending on the specific graphene distribution patterns. This provides useful design guidelines for the application of these plates as structural components in the aeronautical field.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yi Wang, Yihe Zhang, Rory Gover, Jie Yang, Yingyan Zhang
Summary: Graphene has excellent physical properties, but its two-dimensional structure limits its application as reinforcing fillers in composites. In this study, an origami technique was used to improve the flexibility of graphene. Molecular dynamics simulations showed that graphene origami (GOri) can withstand higher loads and indentation depths than pristine graphene. The flexibility and strength of GOri can be further enhanced in the bilayer format. This study provides insights into the failure mechanisms and mechanical properties of GOri for graphene-based impact protection applications.
Article
Mechanics
Jinlong Yang, Yucheng Fan, Fan Zhu, Zhi Ni, Xili Wan, Chuang Feng, Jie Yang
Summary: This study uses machine learning to predict the compressive strength of carbon nanotube reinforced cement composites at 28 days, considering the effect of specimen size and the distribution of carbon nanotube dimensions. Specimen size is found to significantly affect the compressive strength. Artificial neural network achieves the best performance, while AutoGluon-Tabular demonstrates improved efficiency and flexibility with satisfying results.
COMPOSITE 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)
Article
Materials Science, Multidisciplinary
Zhi Ni, Fan Zhu, Yucheng Fan, Jinlong Yang, Ziyan Hang, Chuang Feng, Jie Yang
Summary: This paper investigates the damped nonlinear vibration of the functionally graded graphene nanoplatelet-reinforced composite (FG-GNPRC) dielectric membrane. The effects of damping and dielectric properties are considered, and the governing equations are discretized and numerically solved. The influences of functionally graded distribution, damping, stretching ratio, dimensions of the membrane, and the attributes of the electrical field and GNP fillers on the nonlinear vibration of the structure are comprehensively investigated.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Zhi Ni, Yucheng Fan, Ziyan Hang, Jinlong Yang, Chuang Feng, Jie Yang
Summary: The nonlinear dynamics of IL enhanced soft composite (ILESC) dielectric membrane under electro-mechanical loading are investigated in this paper. A mixed micromechanical model is developed to estimate the mechanical and electrical properties of the ILESC. The governing equations are derived and solved using numerical methods. The results are verified through comparison with experimental data and previous results. The influence of various factors on the vibration and resonant response of the ILESC membrane is comprehensively analyzed.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Zixuan Kuang, Airong Liu, Jie Yang, Jian Deng
Summary: This paper investigates the out-of-plane dynamic instability of functionally graded porous graphene platelets reinforced composites circular shallow arches under a radial periodic concentrated load in a thermal environment for the first time. The Hamilton principle is used to derive the equations of motion for the arches. The dynamic instability regions are determined using Bolotin's method and verified with finite element software ANSYS.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Yucheng Fan, Jinlong Yang, Zhi Ni, Ziyan Hang, Chuang Feng, Jie Yang, Yu Su, George J. Weng
Summary: The incorporation of graphene and its derivatives into cement for electrically conductive composites is currently being extensively studied for their potential use as smart materials. However, there is a lack of theoretical models to predict the electrical conductivity and piezoresistive properties of these composites, considering the effects of pores and graphene ripples. To address this gap, this paper proposes a two-step micromechanical modelling to predict the electrical conductivity and strain-sensing response of graphene nanoplatelet reinforced cement composites (GNPRCCs), taking into account the effects of pores and graphene ripples.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Mechanics
Liangteng Guo, Shaoyu Zhao, Jie Yang, Sritawat Kitipornchai
Summary: This study introduces composites reinforced with graphene origami nanofillers into functionally graded multilayered phononic crystals. Numerical investigations reveal that these materials possess negative Poisson's ratio and offer unique mechanical properties, which can be tuned by adjusting the weight fraction and hydrogen coverage of the graphene fillers.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Engineering, Civil
Jasotharan Sriharan, Marcelo Dias, Dilum Fernando, Sondipon Adhikari
Summary: This paper presents a methodology to determine the equivalent homogenised properties for composite cellular core systems, which is applicable to different core shapes and composite wall layer configurations. The proposed model is superior to existing models in its ability to consider different core shapes and composite wall layer configurations.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Youzhe Yang, Jun Ma, Jie Yang, Yingyan Zhang
Summary: Two-dimensional nanomaterials like graphene and h-BN have high mechanical strength and thermal conductivity, making them ideal reinforcing fillers for impact protection materials, phase change materials, and thermal interface materials. However, the mechanical properties of graphene/h-BN heterostructures have not been widely explored. This study used molecular dynamics simulations and finite element analysis to investigate the mechanical properties, fracture mechanisms, and manipulation techniques of graphene/h-BN heterostructures. The results show that heterogeneous GBN has excellent performance in resisting bending deformation, and its size-dependent performance can be manipulated through hydrogenation and layer number.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)
