Article
Engineering, Multidisciplinary
Yiwen Ni, Jiabin Sun, Junlin Zhang, Zhenzhen Tong, Zhenhuan Zhou, Xinsheng Xu
Summary: An accurate buckling model is proposed for the MEE composite cylindrical shell under HTMEE loads, considering non-uniform pre-buckling effects. Nonlinear governing equations involving HTMEE multi-physical coupling effects are derived based on HSDT and von Karman geometrical nonlinearity. The critical buckling stresses and analytical buckling modes for both axisymmetric and non-axisymmetric buckling are obtained through the Galerkin method.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Civil
A. Evkin
Summary: This study investigates the buckling of unstiffened axially compressed cylindrical shells under different types of local perturbations. An improved analytical model based on the Pogorelov's geometrical method is proposed, which effectively describes the qualitative properties of the buckling phenomena. The model is validated through comprehensive quantitative comparison with published numerical and experimental data, allowing for a thorough investigation of shell local buckling behavior and providing a criterion for design buckling load estimation.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Quaiyum M. Ansari, Giovanni Zucco, Luan C. Trinh, Paul M. Weaver
Summary: This work aims to develop data-driven empirical expressions to calculate the upper and lower bound values of cylindrical shells under linear compression loads with various boundary conditions together with various levels of bend/twist anisotropy. Results show that the detrimental effect of boundary conditions and inherent bend/twist anisotropy could lead to a 61% reduction in buckling load, providing a need for detailed studies in this area.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
V. Krasovsky, A. Evkin
Summary: The experimental studies on buckling of dented axially compressed unstiffened cylindrical shells show that the buckling behavior can be described by plateaus, and the lower local buckling loads are slightly influenced by geometric imperfections.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Farzad Ebrahimi, Mahdi Dadashi
Summary: This paper investigates the vibration analysis of a composite cylindrical shell with a core with negative Poisson's ratios and an elastic foundation, subjected to pre-loaded axial compression and external excitation force. The dynamic analysis of the shell is conducted using mathematical methods based on Donnell's improved shell theory, ignoring the shallowness of cylindrical shells. Both the linear and nonlinear aspects of the structure's vibration are discussed. Several parametric examples are presented to show the effects of different parameters on the oscillation of the three-layer cylindrical shell, and the proposed method is compared with other literature attempts to ensure the accuracy and precision of the numerical results.
Article
Engineering, Mechanical
Shengbo Zhu, Zhenzhen Tong, Yongqi Li, Jiabin Sun, Zhenhuan Zhou, Xinsheng Xu
Summary: This paper proposes a new theoretical model for analyzing the post-buckling behavior of two-dimensional decagonal piezoelectric quasicrystal (2D decagonal PQC) cylindrical shells under axial compression. The nonlinear post-buckling equations are established based on the high-order shear deformation theory and phonon-phason-electric coupling effect. New displacement functions are introduced to enhance the Galerkin's method for solving the load-shortening curves and post-buckling deformations accurately. The numerical results are compared with existing solutions and show good agreement. A parametric study is also performed to investigate the effects of geometrical parameters, phonon-phason-electric coupling effect, and applied electric voltage on the post-buckling behavior of the cylindrical shells. The results indicate that geometrical parameters significantly influence the post-buckling equilibrium paths and deformations, while the phonon-phason coupling effect and piezoelectric effect only cause a shift in the equilibrium paths.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Construction & Building Technology
Bo-Li Zhu, You-Hao Zhang, Yan-Lin Guo, Wang-Hui Liu
Summary: This study investigates the elastic buckling behavior of Grid Cylindrical-Lattice Shells (GCLSs) under axial compression, revealing that GCLS tends to fail due to global flexural buckling and circumferential multi-wave buckling under axial compression.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2021)
Article
Mechanics
Zbigniew Kolakowski, Andrzej Teter
Summary: The behavior of FGM cylindrical shells with imperfections under compression was analyzed using an analytical-numerical method. The critical load and imperfection sensitivity surface of real structures were determined. The material gradient and support conditions of the shell were taken into account in the calculations. This research provides insights for the design and verification of shell structures.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Jiabin Sun, Zhenhuan Zhou, Xueqing Cao, Qifeng Zhang, Wei Sun, Zhenzhen Tong, Xinsheng Xu, C. W. Lim, J. N. Reddy
Summary: This study comprehensively investigates the extremely large post-buckling deformation of perforated cylindrical shells through experiments, analytical shell models, and nonlinear finite element simulations. A waisted post-buckling configuration characterized by uniform shrinking in the middle section of the shell is identified. This behavior is attributed to a pattern transformation under compressive load, displaying hyperelastic metamaterial characteristics. The load-carrying capacity of the waisted post-buckling mode suffers a sudden drop and then recovers when the holes are completely collapsed and closed. The negative Poisson's ratio induced by pattern transformation plays a key role in forming the waisted post-buckling modes. The findings have implications for the construction of functional devices for soft robotics, actuators, and structural protection for facilities, among other applications.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Engineering, Civil
Hanxing Zhao, Xin Lan, Liwu Liu, Yanju Liu, Jinsong Leng
Summary: The buckling loads and geometric imperfections sensitivities of SMPC cylindrical shells at different temperatures were determined through numerical simulations and experimental analyses. The results show that the buckling loads obtained by numerical techniques are sensitive to temperature, while the knock-down factors (KDFs) are not. Brittle fracture is the main failure mode at low temperature, posing a risk for design using numerical techniques in this region. At high temperatures, the single perturbation displacement imperfection (SPDI) method overestimates the KDFs, while the KDFs calculated by the multiple perturbation displacement imperfection (MPDI) and linear buckling mode imperfection (LBMI) techniques are in good agreement with experimental results. The LBMI method is able to distinguish the influence of temperature on post-buckling patterns and has better consistency with experiments.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Shengbo Zhu, Jiabin Sun, Zhenzhen Tong, Qingdong Li, Zhenhuan Zhou, Xinsheng Xu
Summary: This paper investigates the post-buckling analysis of MEE composite cylindrical shells subjected to multi-field coupled loadings, establishing nonlinear large deflection governing equations and obtaining post-buckling equilibrium paths through Galerkin's method with good accuracy and agreement. The effects of geometrical parameters, material properties, and multi-field coupled loadings on post-buckling behaviors of MEE composite cylindrical shells are discussed in detail.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
A. Evkin, O. Lykhachova
Summary: In this study, an energy barrier based measure of metastability for axially compressed cylindrical shells made of elasto-plastic material is developed. The concept of local shell buckling is used to estimate design buckling load, eliminating the need to measure initial geometric imperfections in large scale structures. Parametric analysis is performed to derive a formula for design buckling load which identifies the zone of high sensitivity of the shell to imperfections. The formula obtained is compared with experimental results and Eurocode EN 1993-1-6 (2007) recommendations.
THIN-WALLED STRUCTURES
(2021)
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
Mechanics
G. Vamsi Krishna, V Narayanamurthy, C. Viswanath
Summary: The buckling performance of thin metallic shells can be enhanced by external wrapping of FRP composite layers. The effectiveness and extent of such FRP strengthening is influenced by the buckling characteristics of the metallic shell. Through numerical studies, it is found that the increase in hoop modulus of the FRP wrap leads to a stepwise increase in load capacity for elastic buckling shells, while an optimal design for plastic buckling shells can be achieved by a minimal increase in longitudinal stiffness of the FRP wrap. Additionally, an increase in longitudinal stiffness of FRP can significantly increase the buckling capacity of plastic buckling shells failing due to axi-symmetric bulging at their ends.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Yiwen Ni, Shengbo Zhu, Zhenzhen Tong, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim, M. Ahmer Wadee, Stylianos Yiatros
Summary: An accurate nonlinear HTEE buckling analysis of piezoelectric fiber-reinforced composite cylindrical shells subjected to the coupled loading effects of axial compression and hydrostatic pressure was established, considering the nonuniform prebuckling effect. Nonlinear governing equations were derived based on higher-order shear deformation theory and Novozhilov's nonlinear shell theory. Accurate critical buckling stresses, pressures, and explicit buckling modes for both axisymmetric and nonaxisymmetric buckling were obtained through the Galerkin method. A comprehensive parametric study of geometric parameters, end conditions, distribution patterns, and hygrothermal-electric multiphysical fields on the buckling behavior of HTEE composite cylindrical shells was also conducted and discussed.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Tohya Kanahama, Motohiro Sato
Summary: This study theoretically explains the effect of initial deflection and initial slope on self-buckling characteristics of heavy columns and proposes a formula characterizing the self-buckling problem. The results show that the greatest height is proportional to the 2/3 power of radius, and the formula can potentially predict the height of tree-like natural structures.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Aps Selvadurai, Alexander P. Suvorov
Summary: This paper examines the torsion of a solid cylinder made of a fluid-saturated porous medium with a hyperelastic porous skeleton. It analyzes the mechanics of the twisted cylinder in both short-term and long-term behaviors, using numerical solutions and the ABAQUSTM finite element code.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
S. Kanaun
Summary: This study focuses on spherical radially transverse isotropic heterogeneous inclusions in homogeneous isotropic conductive host media. The volume integral equation for the field in the medium with an isolated inclusion subjected to a constant external field is solved using Mellin-transform technique. The method allows revealing tensor structure of the solution with precision to one scalar function of radial coordinate. The study also investigates the influence of neutral inclusions and conductivity coefficients on the effective conductivity of the composite material.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Marinos Kattis, Vassilis Tsitsos, Vassilis Karatzaferis
Summary: The proposed model utilizes continuum mechanics to describe the mechanical behavior of a weakened interface between materials with microstructure, simulating the weakened interface using a surface elastic medium adhering on either side with bulk elastic continua. The model is able to investigate the effect of a weakened interface on stress concentration around inhomogeneities embedded in an unbounded matrix of Cosserat materials.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Shixiang Zhao, Yu. V. Petrov, Yuyi Zhang, G. A. Volkov, Zejian Xu, Fenglei Huang
Summary: This paper theoretically studies the thermal softening related to stress relaxation using the incubation time approach and examines the temperature-time correspondence. The developed relaxation model of plasticity (RP model) is analyzed and compared with other constitutive models and artificial neural networks. The advantages and disadvantages of different models are discussed, and the differences between the ANN model and other constitutive models are examined.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Ivan I. Argatov, Federico J. Sabina
Summary: This study models a seismic metabarrier as a cluster of single-degree-of-freedom resonator units and considers the scattering effects on pulsed Rayleigh waves caused by the vertical displacements of the resonators and the normal contact forces. The variation of the amplitude reduction factor due to the model parameters variation is studied in detail.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
