Article
Engineering, Multidisciplinary
Viet Duc Nguyen, Quoc Vuong Vu
Summary: This study comprehensively explores the characteristics of static bending and free and forced vibration of double-layer auxetic functionally graded porous (FGP) sandwich plates with shear connectors under blast load. The proposed theory innovatively ensures zero transverse shear stresses at the two free surfaces of each layer without the need for shear correction factors used in previous theories. Navier's exact solution is used for the plate issue with fully supported boundary condition, while a plate element with nine nodes is used for altered boundary conditions. The research findings have the potential to be applied in the construction of military and civil works exposed to explosive loads.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Mechanics
Quoc-Hoa Pham, Phu-Cuong Nguyen, Trung Thanh Tran
Summary: The main goal of this study is to investigate the dynamic response of sandwich nanoplates with a porous functionally graded (PFG) core using isogeometric analysis (IGA) and higher-order shear deformation theory (HSDT). The small-scale effect in nanostructures is taken into account by employing the nonlocal elasticity theory. The proposed method is validated by comparing the numerical results with published works, and some examples are conducted to examine the influence of parameters on the dynamic response of the sandwich nanoplates with the PFG core.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Composites
A. Gargano, R. Das, A. P. Mouritz
Summary: Naval ships are at risk from explosive blasts and therefore require sandwich composite structures that can resist extreme deformation and damage. An experimental study compared the blast response of sandwich composite panels with different core materials and laminate facesheets. The study found that fiberglass laminate facesheets were more resistant to blast-induced damage than carbon fiber facesheets, and balsa wood was more extensively damaged compared to polymer foam.
COMPOSITES COMMUNICATIONS
(2022)
Article
Mechanics
Marco Amabili, J. N. Reddy
Summary: This study investigates the nonlinear mechanics of sandwich plates by using different deformation theories for face sheets and core, introducing 16 independent kinematic parameters. The results show that the introduction of thickness deformation parameters and geometric nonlinearities significantly impact the numerical simulation results of sandwich plates.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Farzad Ebrahimi, Mohaddese Sepahvand
Summary: This article investigates the wave propagation and effective characteristics of auxetic materials in cylindrical sandwich shells. It describes the analytical solution and numerical investigation to analyze the influence of different parameters on wave behavior.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Materials Science, Multidisciplinary
Yanchun Zhai, Yonghua Huang, Qingcong Luan, Xuehui Yin
Summary: In this paper, a refined piecewise shear deformation model is proposed to reduce the number of independent generalized displacements and vibration equations in traditional piecewise models for laminated composite and sandwich plates. The proposed theory introduces assumptions and divides the transverse displacement into bending and shear parts to obtain displacement fields. Hamilton's principle is employed to derive the governing equations, which are then solved using the closed-form Navier method. The validity of the solutions is confirmed by comparing them with previous literature. The variations of frequencies and loss factors with system parameters are evaluated and presented graphically.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Marine
Nguyen Van Long, Tran Ich Thinh, Dao Huy Bich, Tran Minh Tu
Summary: This paper presents the nonlinear dynamic responses of sandwich-FGM doubly curved shallow (SFDCS) shells under underwater explosions. Two different configurations of SFDCS shells on an elastic foundation are considered. The governing equations are derived based on the first-order shear deformation theory (FSDT), and the nonlinear dynamic response of the sandwich FGM shell with simply supported boundary condition is analyzed using the Galerkin method and fourth-order Runge-Kutta method. The numerical results show the effects of geometrical and material parameters, explosive weight, stand-off distance, pre-loaded static biaxial and axial compressions, linear damping coefficient, Winkler/Pasternak foundations on the nonlinear dynamic responses of the considered sandwich shells.
Article
Mechanics
Bharti M. Shinde, Atteshamuddin S. Sayyad
Summary: This paper presents static and free vibration analysis of simply supported FGM sandwich shells using a new higher order shear and normal deformation theory, considering the effects of transverse normal stresses. Solutions of simply supported cylindrical and spherical shells are obtained using Navier's solution technique. The present results are compared with previous results to validate the theory.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Chung -De Chen, Bing-Feng Huang
Summary: A novel higher-order refined zigzag theory (HRZT) is presented for solving the static bending problems of a sandwich composite beam with a soft core. The HRZT is able to preserve the advantages of the refined zigzag theory (RZT) on the modeling of the zigzag displacement, while improving the shear stress distributions that are continuous across the interface between two layers. The accuracy of HRZT is verified by comparing the results with finite element method (FEM) using commercial software.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Civil
Tran Quoc Quan, Do Thi Thu Ha, Nguyen Dinh Duc
Summary: This paper presents an analytical approach to study the nonlinear vibration of porous functionally graded sandwich plates subjected to blast loading on elastic foundations. The effects of various parameters on the vibration behavior of the sandwich plates are investigated using numerical methods. The obtained results are compared with experimental data to validate their reliability.
THIN-WALLED STRUCTURES
(2022)
Review
Chemistry, Physical
Faris Tarlochan
Summary: It is essential to design proper engineering structures as energy absorbers for high dynamic loading situations, such as accidents, blasts, or impacts. One type of energy absorbers is sandwich structures, which are capable of absorbing high kinetic energy through irreversible deformation. These structures, particularly with foam and architected cores, show potential for wider applications due to their lightweight nature and high-energy absorption capabilities, despite the lack of consensus on a particular design among existing literature.
Article
Engineering, Mechanical
Guangtao Wei, Lijia Feng, Qianqian Wu, Linzhi Wu
Summary: This paper presents a new theory on the elastoplastic transient response of sandwich beams under large displacement with moderate rotation, and validates it through numerical simulations. The study reveals that strain hardening has significant effects on the dynamic response of sandwich beams.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Mechanics
Mehmet Avcar, Lazreg Hadji, Omer Civalek
Summary: This study aims to analyze the natural frequencies of sigmoid functionally graded sandwich beams using high-order shear deformation theory. Three diverse sandwich layup schemes were constructed, and the effects of various factors on the non-dimensional natural frequencies were discussed. The efficiency of the theory was demonstrated by comparing results with open literature and considering different material properties, layup schemes, and geometrical characteristics.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Murlidhar Patel, Shivdayal Patel, Suhail Ahmad
Summary: The explosive blast poses a significant threat in the form of terrorist attacks on defense, aerospace, and civilian structures. In order to protect human lives and property, researchers have been searching for blast-resistant structures. This study designed a stainless-steel sandwich structure and investigated the performance of aluminum foam-filled honeycomb and carbon fiber reinforced polymer (CFRP) with steel skins. The results showed that using lightweight FRP on the front and back skins of the sandwich structure reduced deflection and improved energy absorption, enhancing the blast resistance.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Mechanical
Kun Liu, Li Ke, Yanyan Sha, Guangming Wu, Peng Wang, Zili Wang
Summary: This study investigates the dynamic response characteristics of laser-welded corrugated sandwich panels under a long-time plane blast wave through experiments and numerical simulations. A simplified analysis method is proposed based on the simulation results. The reliability of the method is confirmed.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
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)