Article
Engineering, Civil
Domenico Magisano, Giovanni Garcea
Summary: This paper proposes an efficient continuation method for sensitivity analysis of thin-walled structures, allowing for a more accurate analysis of the impact of geometric imperfections on the system and quickly identifying the worst-case imperfection. The method utilizes analytical computation of the Jacobian and a mixed scheme with element-wise stress variables to improve the efficiency of iterative solutions. Additionally, analytical derivatives of the critical point with respect to imperfection parameters are obtained, aiding in the generation of a gradient-based critical path for rapid search of worst-case imperfections.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Marine
Shen Li, Do Kyun Kim
Summary: This study focuses on the parametric investigation of unstiffened cylindrical shells under axial compression, finding that the ultimate strength is highly sensitive to initial geometric imperfections. Current code-based approaches appear to be overly conservative in predicting the ultimate compressive strength of cylindrical shells.
Article
Engineering, Civil
M. Radwan, B. Kovesdi
Summary: In recent years, there has been a growing preference for welded box-sections in the construction industry due to their ease of fabrication and improved stability characteristics. However, welded box-sections are prone to various instabilities, with interactive buckling being the primary concern. The current research aims to investigate the interactive buckling capacities of both square and rectangular welded box-sections and propose a general rule for imperfection combination that can be applied to all welded box-section columns.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Marine
N. Rathinam, B. Prabu, N. Anbazhaghan
Summary: In this work, FE models were developed to predict the failure modes of externally ring stiffened cylindrical shells, and the shell's instability failure modes were analyzed using finite element analysis. The developed FE models were validated by comparing numerical results with experimental data, ensuring their reliability.
JOURNAL OF OCEAN ENGINEERING AND SCIENCE
(2021)
Article
Engineering, Multidisciplinary
Yujie Guo, Maodong Pan, Xiaohui Wei, Fei Luo, Fangbin Sun, Martin Ruess
Summary: This research extends the previous work on nonlinear stability analysis to dynamic buckling analysis, prediction of complex snap-through and mode-jumping behavior. A modified generalized-alpha time integration scheme combined with a nonlinear isogeometric Kirchhoff-Love shell element is used for accuracy and controllable high-frequency dissipation. Weak enforcement of boundary conditions and a least-squares B-spline surface fitting approach are proposed to model geometric imperfections. The proposed method outperforms established developments in terms of solution quality and robustness.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Mechanics
Xin Liu, Qianqian Wu, Guocai Yu, Linzhi Wu
Summary: This study systematically investigates the failure behaviors and ultimate strength of ceramic cylindrical shells under hydrostatic pressure. The results show that increasing the thick-radius ratio or decreasing the length-radius ratio can effectively improve the structural tolerance pressure, and the conversion of failure modes is revealed by changing the geometrical parameters. This work provides engineering guidance for underwater pressure-resistant structural design.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
M. Cetkovic
Summary: This paper presents the influence of initial geometrical imperfections on the thermal stability of laminated composite plates using a layer wise plate model. The mathematical model considers the variation of in-plane displacements, non-linear strain-displacement relations, and linear thermo mechanical material properties. The effects of various parameters on the critical buckling temperature are analyzed and the accuracy of the numerical model is verified.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Yongmei Zhu, Wei Guan, Weili Wang, Cunhao Dong, Jian Zhang
Summary: This study numerically and experimentally investigated the buckling of carbon fiber composite cylindrical shells with annular ribs under external pressure. It was found that the distribution and geometry of the ribs have a significant influence on the buckling load and final collapse mode of the material.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Gaojian Lin, Fei Li, Qiuting Zhang, Pengwan Chen, Weifu Sun, Ivan Saikov, Vladimir Shcherbakov, Mikhail Alymov
Summary: This study investigated the dynamic stability of cylindrical fiber composite shells with metal liner subjected to uniform internal pressure pulse, revealing the pulse buckling of the inner metal liner and vibrational buckling of the outer fiber composite shell. Numerical simulations showed the effect of buckling amplitude of the inner metal liner on the dynamic stability of the outer fiber composite shell.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Luigi Solazzi
Summary: The goal of this research is to evaluate the variability of the buckling load in thin orthotropic cylindrical shells due to the deviation with respect to the nominal values, for both the geometrical and material properties. The main implication of the results is that material properties have a greater impact on the standard deviation of the critical buckling load compared to fiber orientation.
COMPOSITE STRUCTURES
(2022)
Review
Materials Science, Composites
Liwei Zhang, Liyuan Zhao, Lin Pan, Jiangang Gao
Summary: This study comprehensively compares and analyzes the classification, preparation technology, and mechanical properties of composite cylindrical shells (CCS), and deeply analyzes the axial compression strength, axial compression elasticity theory, and strength criterion of orthotropic composite materials for CCS. The basic theory of instability and buckling, as well as the stability theory of CCS, are analyzed in detail. The research difficulties of composite cylindrical shell are given, and the future development direction of CCS is predicted. It provides an important reference for scientific research and engineering application of CCS.
POLYMER COMPOSITES
(2023)
Article
Engineering, Civil
Licai Yang, Tian Qiu, Shanglin Zhang
Summary: This paper analytically investigates the buckling behavior of cylindrical shells with axial variable elastic modulus under axial compressive load for the first time. The distributed elastic modulus is expressed as a combination of constant and variable components. Governing differential equations are derived and solved using the combined perturbation method and Fourier analysis. Closed analytical solutions are obtained for cylinders with arbitrary elastic modulus variations, revealing the relationships among buckling load, shell sizes, and elastic modulus functions. The presented solutions serve as benchmarks for buckling analyses of thin-walled cylinders with elastic modulus variations resulting from design, manufacturing processes, and material imperfections.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Mechanics
Fabien Royer, John W. Hutchinson, Sergio Pellegrino
Summary: The stability of lightweight space structures composed of longitudinal thin-shell elements connected trans-versely by thin rods is investigated. The role of localization in the buckling of these structures is investigated and early transitions into the post -buckling regime are unveiled.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Civil
Abubakr E. S. Musa, Madyan A. Al-Shugaa, Husain J. Al-Gahtani
Summary: This study investigates the buckling behavior of metal cylindrical shells subjected to axial compressions. The research highlights the complex interaction between intended and unintended geometric imperfections in experimental investigations, making it challenging to identify the sole effect of either one. A simple approximate procedure is proposed to account for the effect of unintended imperfections in order to evaluate the buckling strength reduction due to certain intended forms of imperfection. The study also suggests general recommendations for conducting combined experimental-numerical parametric studies.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Sumeet Chakraborty, Tanish Dey
Summary: This study investigates the nonlinear stability characteristics of simply supported carbon nanotubes reinforced composite cylindrical shell panel under combined axial compressive loading and localized heating using a semi-analytical approach. The thermomechanical properties of the panel are considered temperature-dependent and modeled using higher order shear deformation theory and von Karman type nonlinearity. The influence of various dispersion profiles of CNTs, CNT volume fraction, and heating profiles on the buckling and post-buckling characteristics of the panel subjected to thermomechanical loadings is demonstrated through obtained results.
COMPOSITE STRUCTURES
(2021)
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)