Article
Mechanics
Hukum Chand Dewangan, Mukesh Thakur, S. S. K. Deepak, Subrata Kumar Panda
Summary: This study introduces two different geometrical nonlinear strain-displacement relationships for modeling laminated shell structures with cutouts and a higher-order displacement model. It highlights the necessity of Green-Lagrange's nonlinear strain in higher-order displacement kinematics. The predicted nonlinear solutions are validated through examples, demonstrating the effects of cutouts and multilayered structures.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Yuqiang Gao, Lifeng Wang
Summary: In this paper, a new composite metamaterial structure with negative effective mass density, negative effective modulus, and an ultralarge Poisson's ratio is designed for various applications including vibration isolation, wave filtering, programmable waveguide construction, and negative refraction. The metamaterial achieves vibration isolation with different frequency ranges through shunting circuits and a negative longitudinal modulus in a two-dimensional plate with an ultralarge Poisson's ratio. By controlling the shunting circuits, wave propagation and waveguide construction can be programmatically realized, and negative refraction is also achieved without altering the geometric structure of the metamaterial.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Physical
Linyi Yang, Mao Ye, Yonghui Huang, Jingkun Dong
Summary: A negative Poisson's ratio honeycomb material has anti-conventional deformation behavior and high impact resistance, making it a promising lightweight microstructure material. However, research on three-dimensional structures is limited compared to microscopic and two-dimensional levels. Three-dimensional negative Poisson's ratio structural mechanics metamaterials have advantages of lighter mass, higher material utilization, and more stable mechanical properties, and they have great potential for development in aerospace, defense, and transportation industries.
Article
Materials Science, Multidisciplinary
J. E. Li, B. L. Wang
Summary: This paper investigates the problem of a layered and orthotropic material with a negative Poisson's ratio under a horizontal punch through a rigid line. The results show that materials with a negative Poisson's ratio have the potential to reduce stress concentration and increase punch resistance.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Ziyang Qu, Meiling Xu, Shuyi Lin, Yiwei Liang, Xuanhao Yuan, Feilong Wang, Jian Hao, Yinwei Li
Summary: In this study, a two-dimensional material called Si2S with a negative Poisson's ratio was predicted using first-principles methods. The Si2S monolayer has a puckered lattice structure and exhibits negative Poisson's ratios along both x and y directions. It also shows semiconductor properties and a high absorption coefficient for visible light, as well as good oxidation resistance. These versatile properties make Si2S a promising material for nanodevices.
Article
Engineering, Civil
Pham Hong Cong, Nguyen Dinh Duc
Summary: This paper proposes an analytical approach to investigate the nonlinear dynamic analysis of PES double curved shallow auxetic shells with NPR under various loads, validating the feasibility and accuracy of the method. Additionally, the effects of multiple factors on the dynamic response of the shells are studied in detail.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Pham Hong Cong, Nguyen Dinh Duc
Summary: This study conducted a nonlinear thermo-mechanical analysis on auxetic material double curved shallow shells with imperfect eccentric stiffening, considering the effects of external pressure, axial compressive and thermal loads. The study also evaluated the influences of reinforced stiffeners, elastic foundation, pores, and temperature-dependent material properties on the buckling and postbuckling loads of the shells. The results showed significant impacts of reinforced stiffeners, auxetic core, temperature, and porous distribution on the structural behavior.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Reza Jahangiri, Mousa Rezaee, Hosein Manafi
Summary: This study investigates the nonlinear and chaotic instability of functionally graded double curved shallow sandwich shells under the simultaneous effect of in-plane and transverse excitations. The study derives the equations of motion and solves them numerically to study the stability of nontrivial solutions and the effect of various parameters on the system response. The study also analyzes the conditions for the occurrence of periodic, double periodic, multi-periodic, and chaotic behaviors by analyzing the characteristic curves and system time response.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Habib Ahmadi, Aliakbar Bayat, Nguyen Dinh Duc
Summary: This study investigates the non-linear vibrations of stiffened imperfect functionally graded double-curved shallow shells, as rested on nonlinear elastic foundations. The shells are exposed to external harmonic excitation and thermal situations. The modeling of shells is derived according to the classical shell theory and the non-linear geometric von Karman relationships, considering material properties changes along the thickness direction based on a power law index. The study uses analytical and numerical methods to analyze the resonance behavior and nonlinear dynamic behaviors of the shells under various conditions.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Weitao Lv, Dong Li, Liang Dong
Summary: This paper established a sandwich panel with a 3D isotropic foam core with negative Poisson's ratio using FEM, and found that the sandwich panel with the minimum Poisson's ratio core exhibited the highest blast resistance performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Jianbang Shen, Jingran Ge, Junhua Xiao, Jun Liang
Summary: In this study, a honeycomb structure with curved reentrant sides and negative Poisson's ratio (NPR) was designed, and the impact dynamics behaviors were investigated using finite element method. The study found that the Poisson's ratio and energy absorption capacity of the honeycomb structure varied with the arc angle and compression velocity.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
T. Liu, W. Zhang, M. Q. Wu, Y. Zheng, Y. F. Zhang
Summary: The occurrence conditions of metastable chaotic vibrations in bistable asymmetric composite laminated square shallow shell under foundation excitation were studied. Metastable chaos was observed in vibration experiments, and the critical instability condition of the zero equilibrium point was analyzed using numerical simulations and theoretical analyses. It was found that large parametric excitation is a key factor for the existence of metastable chaos in the system.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Y. Yao, Y. Ni, L. H. He
Summary: The study explores the origin of negative Poisson's ratio in rutile-type oxides and fluorides through density functional theory (DFT) simulation, highlighting the dominant role of nearest-neighbor central force interactions. A new three-dimensional mechanical metamaterial is designed by mimicking the bond structure via elastic beams. The analytical expressions for the effective Poisson's ratio and compressibility are derived and validated by finite element computations, indicating the material can exhibit negative Poisson's ratio and negative linear, area, or volume compressibility simultaneously.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Elze Porte, Rebecca Kramer-Bottiglio
Summary: Highly stretchable capacitive sensors are ideal for soft robotic control, but traditional models fail to accurately predict their performance due to the complex multi-layered structure and material properties. Measuring the Poisson's ratio of multi-layered hyperelastic capacitors and considering the anisotropy and strain-dependent characteristics of the material in predicting sensor performance are crucial for improvement.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Engineering, Civil
Qi He, Yi-Liang Zhou, Ming Li, Lin He, Hong-Liang Dai
Summary: This paper investigates the nonlinear vibration characteristics and response of laminated carbon fiber reinforced resin doubly-curved shallow shell with a porous microcapsule coating under hygrothermal environment. The nonlinear equations of motion are obtained using Hamilton's principle and solved by the direct integration method and Runge-Kutta method. The study considers the effects of temperature, moisture, microcapsule geometric parameters, shell geometric parameters, laying angle for carbon fiber, and porosity of the coating matrix. Numerical examples show that temperature, moisture, edge length, laying angle for carbon fiber, and porosity of the coating matrix have a positive effect on the dimensionless nonlinear frequency ratio, but a negative effect on the dimensionless linear and nonlinear natural frequency of the shell. Additionally, temperature, moisture, edge length, laying angle for carbon fiber, and porosity of the coating matrix are proportional to the dimensionless nonlinear amplitude of the shell.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Kamran Foroutan, Seyyed Mojtaba Varedi-Koulaei, Nguyen Dinh Duc, Habib Ahmadi
Summary: This paper investigates the non-linear static and dynamic buckling analyses of laminated composite cylindrical shells using swarm-based metaheuristics to optimize the fiber's angles. It is found that the optimization algorithms significantly improve the critical buckling load values, with the WOA algorithm performing the best among the ones tested.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Mechanics
Do Quang Chan, Tran Quoc Quan, Bui Gia Phi, Dang Van Hieu, Nguyen Dinh Duc
Summary: This paper provides an analysis of the critical buckling load and vibration frequencies of a sandwich cylindrical panel with functionally graded face sheets and FG porous core on an elastic foundation, considering both mechanical load and thermal environments. The panel is modeled using the framework of nonlocal strain gradient theory and classical shell theory, and the effects of various parameters such as nonlocal and strain gradient parameters, material and geometrical characteristics, porosity, temperature, and elastic foundation are considered.
Article
Engineering, Aerospace
Ehsan Arshid, Zeinab Soleimani-Javid, Saeed Amir, Nguyen Dinh Duc
Summary: This study investigates the vibrational behavior of three-layered cylindrical shells with graphene nanoplatelets (GNPs)-reinforced composite core and piezo-electro-magnetic (PEM) face sheets, providing theoretical support for the design and manufacture of more efficient engineering structures.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Civil
Nguyen Van Quyen, Nguyen Dinh Duc
Summary: This paper investigates the nonlinear dynamic response and vibration of multilayer organic solar panels under mechanical and thermal loadings. The results show that elastic foundations have a positive effect on the free vibration and dynamic response of solar panels, while temperature increment and initial imperfection have a negative effect.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Tran Quoc Quan, Ngo Dinh Dat, Nguyen Dinh Duc
Summary: This study presents analytical solutions for the static buckling and vibration analysis of nanocomposite multilayer perovskite solar cell (NMPSC) on elastic foundations. The NMPSC consists of six isotropic layers including Au, PEDOT:PSS, perovskite, PCBM, ITO, and glass. The basic equations are derived based on the Reddy's higher order shear deformation plate theory with consideration of Pasternak-type elastic foundations interaction, von-Karman strain terms, initial imperfection, and damping. The effects of various factors on the static buckling and vibration characteristics of the NMPSC are discussed through parametric studies.
Article
Mechanics
Nguyen Dinh Khoa
Summary: This study aimed to investigate the complex external condition of a smart electric magnetic panel using an analytical approach, considering uniformed load, thermal load, moisture parameter, and electric-magnetic potentials. The panel consists of a graphene core and outer layers made of barium titanate and cobalt ferric oxide. The study used the Ready's first-order shear deformation and Hamilton's theory to derive the basic equation, applied the Galerkin method to determine the natural frequency and dynamic response, and analyzed the influence of various factors such as piezoelectric outer layer, geometry parameters, imperfections, and electric and magnetic fields using numerical methods.
Article
Engineering, Aerospace
Vu Thi Thuy Anh, Nguyen Dinh Khoa, Tuan Ngo, Nguyen Dinh Duc
Summary: This study proposes a hybrid sandwich shell model to reduce risks and costs for structures made of advanced materials. The analytical solution demonstrates the significant effects of geometrical and material parameters as well as stiffeners on the vibration of sandwich double-curved shallow shells subjected to blast loading. The results show that the shell with stiffener has a higher load-carrying capacity and the combination of material layers in a hybrid shell has significant advantages over a homogeneous shell, even under blast load.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Ngo Dinh Dat, Vu Thi Thuy Anh, Nguyen Dinh Duc
Summary: The study aims to evaluate the effects of various geometrical parameters, materials, and boundary conditions on the vibrations of a smart cylindrical sandwich shell, and use the bees algorithm to optimize the natural frequencies based on the geometric and material parameters. The shell structure consists of two layers of magneto-electro-elastic material and a middle layer of functionally graded graphene platelets reinforced composite. The results of the study are discussed through parametric studies.
Article
Engineering, Civil
Pham Minh Vuong, Nguyen Dinh Duc
Summary: In this paper, the nonlinear vibration response of toroidal shell segments with varying thickness subjected to external pressure is analytically investigated. The shells are made of functionally graded material (FGM) composed of ceramic and metal constituents. The material properties of the FGM shells are assumed to be gradually graded in the thickness direction. Based on Reddy's third-order shear deformation shell theory and von Karman nonlinearity, the equations of motion for the variable thickness FGM toroidal shell segments are established. The Galerkin method and Runge-Kutta method are used to solve the governing system of partial differential equations, and the effects of material and geometrical parameters on the nonlinear vibration response are analyzed through numerical analysis.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Phuc Minh Pham, Duc Nguyen Dinh
Summary: In this study, free oscillation of a cracked smart plate made of magneto-electro-elastic functionally graded materials on an elastic foundation is investigated using high-order shear deformation theory. Phase-field theory is used to simulate the crack state of smart plates. A detailed parametric analysis was performed to evaluate the effects of various factors on the free vibrational properties of magneto-electro-elastic functionally graded plates.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Mechanical
Nguyen Dinh Duc, Kamran Foroutan, Seyyed Mojtaba Varedi-Koulaei, Habib Ahmadi
Summary: This paper investigates the nonlinear vibration analysis of laminated composite cylindrical shells under external loading. The objective is to optimize fiber angles using meta-heuristic optimization algorithms. Equations derived by classical shell theory and von Karman's nonlinearity are solved using the Galerkin method. The study compares the performance of particle swarm optimization (PSO) and whale optimization algorithm (WOA) for different numbers of layers, and concludes that PSO performs better in the five layers case.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Engineering, Civil
Jian Xue, Weiwei Zhang, Jing Wu, Chao Wang, Hongwei Ma
Summary: This study integrates a plate-type local resonator with varying free boundaries within a plate to convert the initial low-order global vibration modes into localized vibration modes. A novel semi-analytical method is proposed to analyze the free vibration of the plate with thickness and displacement discontinuities. The results show that by applying free boundary conditions, the low-order localized vibration frequencies can be significantly reduced without affecting the low-order global frequencies.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Merve Tunay
Summary: In recent years, there has been an increasing number of studies on the mechanical properties of sandwich structures manufactured with the Fused Deposition Modeling (FDM) method. However, there is still a lack of experimental data on the mechanical characteristics of FDM-manufactured sandwich structures under different thermal aging durations. In this experiment, the energy absorption capabilities of sandwich structures with different core geometries were investigated under various thermal aging durations. The results showed that the core topology significantly influenced the energy absorption abilities of the sandwich structures.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Zi-qin Jiang, Zi-yao Niu, Ai-Lin Zhang, Xue-chun Liu
Summary: This paper proposes a crosssection corrugated plate steel special-shaped column (CCSC) that improves the bearing capacity and overall stability of structural columns by using smaller material input. Through theoretical analysis and numerical simulation, the overall stability of the CCSC under axial compression is analyzed. The design method and suggestions for the stability of CCSC are put forward. Compared with conventional square steel tube columns, the CCSC has obvious advantages in overall stability and steel consumption.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yong Zhang, Yangang Chen, Jixiang Li, Jiacheng Wu, Liang Qian, Yuanqiang Tan, Kunyuan Li, Guoyao Zeng
Summary: A hybrid TPMS method was proposed to develop a new TPMS structure, and the mechanical properties of different TPMS structures were studied experimentally and numerically. Results showed that the hybrid TPMS structure had higher energy absorption and lower load-carrying capacity fluctuation. Further investigations revealed that the topological shape and material distribution had significant influence on mechanical properties, and the hybrid additive TPMS structure exhibited significant crashworthiness advantage in in-plane crushing condition.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Tongfei Sun, Ye Liu, Kaoshan Dai, Alfredo Camara, Yujie Lu, Lijie Wang
Summary: This paper presents a series of experimental and numerical studies on the performance of a novel double-stage coupling damper (DSCD). The effects of damper configuration, friction-yield ratio (Rfy), and loading protocol on the hysteresis performance of the DSCD are investigated. The test results demonstrate that the arrangement of ribs in the DSCD increases its energy dissipation capacity. Numerical analysis reveals that the length of the friction mechanism and the clearance between the yield segment and the restraining system affect the energy dissipation and stability of the damper.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Jeonghwa Lee, Young Jong Kang
Summary: This study investigates the local buckling behavior and strength of I-shape structural sections by considering flange-web interactions through three-dimensional finite element analysis. The study provides a more reasonable estimation of local buckling strength by considering the ratio of flange-web slenderness and height-to-width ratio, and presents design equations for flange local and web-bend buckling coefficients.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yizhe Chen, Wenfeng Xiang, Qingsong Zhang, Hui Wang, Lin Hua
Summary: This study investigates the surface modification of a nickel plate to improve the bonding strength with carbon fiber-reinforced plastics (CFRP). The results show that different surface modification methods, including sandblasting, coupling agent treatment, and compound coupling agent treatment, significantly enhance the bonding strength of CFRP/Ni joints. The research provides insights into improving the connection between nickel and CFRP, as well as other heterogeneous materials.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Agha Intizar Mehdi, Fengping Zhang, Moon-Young Kim
Summary: A spatial stability theory of mono-symmetric thin-walled steel beams pre-stressed by spatially inclined cables is derived and its validity is demonstrated through numerical examples. The effects of initial tension, deviator numbers, inclined cable profiles, and bonded/un-bonded conditions on lateral-torsional buckling of the pre-stressed beams are investigated, with a specific emphasis on the effects of increasing initial tension.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Teng Ma, Jinxiang Wang, Liangtao Liu, Heng Li, Kui Tang, Yangchen Gu, Yifan Zhang
Summary: The structural response of water-back plate under the combined action of shock wave and bubble loads at water depths of 1-300 m was numerically investigated using an arbitrary Lagrange-Euler method. The accuracy of the numerical model was validated by comparing with experimental and theoretical results. The influences of water depth and length-to-diameter ratio of the charge on the combined damage effect were analyzed. The results show that as water depth increases, the plastic deformation energy of the water-back plate decreases, and the permanent deformation mode changes from convex to concave. When the charge has a large length-to-diameter ratio, the plastic deformation energy of the radial plate is higher than that of the axial plate, and the difference decreases with increasing water depth. Increasing the length-to-diameter ratio enhances the combined damage effect in the radial direction in deep-water environments.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiu-Yun Li, Ben Young
Summary: This paper investigates the flexural performance of CFS zed section members bent about the neutral axis parallel to the flanges through experimental and numerical analysis. The results show that the current direct strength method generally provides conservative predictions for the flexural strength of unstiffened zed section members, but slightly unconservative design for edge-stiffened zed section beams. The nominal flexural strengths of zed section members with edge stiffeners were found to be underestimated by 17% to 21% on average. Modified DSM formulae are recommended for the design of CFS zed section beams.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Weinan Gao, Bo Song, Xueyan Chen, Guochang Lin, Huifeng Tan
Summary: This paper presents a precise method for predicting deformation in large-scale inflatable structures, utilizing finite element modeling and laser scanning technique. The study shows a good agreement between the predictive model and non-contact measurement results.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Fei Gao, Zongyi Wang, Rui Zhu, Zhenming Chen, Quanxi Ye, Yaqi Duan, Yunlong Jia, Qin Zhang
Summary: This research investigates the mechanical properties of high-strength ring groove rivet assemblies and the load resistances of riveted T-stubs. Experimental tests reveal that Grade 10.9 rivets have higher yield strength and strain, and lower ultimate strain, making them suitable for high-strength ring groove rivet connections. Increasing the rivet diameter benefits the T-stubs, while increasing the flange thickness is not always advantageous. The Eurocode 3 method is not suitable for T-stubs connected through ring groove rivets, while the Demonceau method is conservative.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Shangchun Jiang, Liangfeng Sun, Haifei Zhan, Zhuoqun Zheng, Xijian Peng, Chaofeng Lue
Summary: This study investigates the bending behavior of two-dimensional nanomaterials, diamane and its analogous structure TBGIB, through atomistic simulations. It reveals that diamane experiences structural failure under bending, while TBGIB bends elastically before undergoing structural failure. The study provides valuable insights for the application of these materials in flexible electronics.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiang Zhang, Jianian Wen, Qiang Han, Hanqing Zhuge, Yulong Zhou
Summary: In this study, the mechanical properties of Q690 steel H-section columns under bi-directional cyclic loads are investigated, considering the time-varying characteristics of corrosion. A refined finite element (FE) model is built to analyze the degradation of mechanical property and failure mechanisms of steel columns with different design parameters during the whole life-cycle. The study proposes a quantitative calculation method for the ultimate resistance and damage index of steel columns, taking into account the ageing effects. The findings emphasize the importance of considering the ageing effects of steel columns in seismic design.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yuda Hu, Qi Zhou, Tao Yang
Summary: The magneto-thermo-elastic coupled free vibration of functionally graded materials cylindrical shell is investigated in this study. The vibration equation in multi-physical field is established and solved using the Hamilton principle and the multi-scale method. The numerical results show that the natural frequency is influenced by various factors such as volume fraction index, initial amplitude, temperature, and magnetic induction intensity.
THIN-WALLED STRUCTURES
(2024)