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Performance of Glubam Structural Members
Published in Yan Xiao, Engineered Bamboo Structures, 2022
Using the tangent modulus theory, the critical buckling load can be calculated by replacing the modulus of elasticity E by the tangent modulus Et, therefore, Ncr=π2EtAλ2
The elastic local buckling behaviour and strength of the simply supported I-beam utilising the energy equilibrium method
Published in Marian A. Giżejowski, Aleksander Kozłowski, Marcin Chybiński, Katarzyna Rzeszut, Robert Studziński, Maciej Szumigała, Modern Trends in Research on Steel, Aluminium and Composite Structures, 2021
S.M. Fujak, Y. Kimura, A. Suzuki
Local buckling is one of the common forms of the stability loss occurring within the section, without the lateral displacement or twist of the whole beam. Local buckling has a significant influence on the behaviour of the whole structure, drastically reducing the frame’s capacity or leading to global loss of stability i.e. the collapse of the structure (Fujak & Kimura 2019).
Short-Circuit Obligation
Published in Fang Zhu, Baitun Yang, Power Transformer Design Practices, 2021
Conductors in inner winding subjected to inward forces have compressive stress. When such stress exceeds limits, the conductors are buckled or the winding shape is deformed, as sketched in Figure 8.6. Two types of buckling exist: forced buckling and free buckling. In forced buckling, the conductors bend inwards between sticks when the compressive stress exceeds the proof stress of the conductor material. The collapse mechanism is the same as axial bending of conductor between radial spacers. The number of sticks placed at insider circumference of the winding plays an important role.
Free vibration and buckling analysis of composite laminated plates using layerwise models based on isogeometric approach and Carrera unified formulation
Published in Mechanics of Advanced Materials and Structures, 2018
Amirhadi Alesadi, Marzieh Galehdari, Saeed Shojaee
One of the significant characteristics of the CUF is that it enables the development of analysis to different fields such as buckling and free vibration analysis in an easier and more applicable way, especially in higher-order theories. In this study, the IGA and CUF have been employed to free vibration and buckling analysis of composite laminated plates using higher-order theories. Buckling phenomenon is associated with a process whereby a given state of a deformable structure suddenly changes its shape. Triggered by a varying external load, this change in configuration often happens in a catastrophic way (i.e., the structure is destroyed at the end of the process) [52]. Two types of buckling exist, nonlinear collapse and bifurcation buckling. Nonlinear collapse is predicted by means of a nonlinear stress analysis. The other case, bifurcation buckling, refers to a different kind of failure, the onset of which is predicted by means of an eigenvalue analysis [53]. Indeed, a simplified method to perform buckling analysis can be devised by interpreting the critical load as the load at which more than one infinitesimally adjacent equilibrium configuration exists (bifurcation point) [54]. If a linear initial equilibrium path is also assumed, linearized stability analysis reduces the determination of the critical load to a linear eigenvalue problem (Euler's method) [55]. This simplified approach can be conveniently applied to flat plates because the critical equilibrium configuration shows a gradual geometry change when the load passes through the critical level.
Prediction of the buckling mode of cylindrical composite shells with imperfections using FEM-based deep learning approach
Published in Advanced Composite Materials, 2023
Ruihai Xin, Vinh Tung Le, Nam Seo Goo
In the study of cylindrical shell structures, there are two distinct types of buckling modes: local buckling and global buckling [11]. Interaction between the two can significantly reduce the buckling load of a thin-walled cylindrical shell with imperfections. Predicting the buckling behavior in the design phase can be challenging without conducting experiments, as these structures often contain imperfections that can impact the buckling behavior. To accurately determine the buckling behavior experimentally, a comprehensive experimental investigation is necessary. However, this can be time-consuming and costly. As a result, multiscale approaches such as the finite element method (FEM) or molecular dynamics are often used for the structural analysis [12,13,14,15].
Exploring buckling and post-buckling behavior of incompressible hyperelastic beams through innovative experimental and computational approaches
Published in Mechanics Based Design of Structures and Machines, 2023
O. Azarniya, A. Forooghi, M. V. Bidhendi, A. Zangoei, S. Naskar
The term buckling refers to the collapse of a structural member under high axial compression. During this collapse, the structural member suddenly deflects to the side. It is stated that the buckling load has been reached when the structure exhibits sudden lateral deflection under axial compression. Given the fact that buckling forces are lower than the maximum loads the structure can hold under axial compression, consideration of buckling during structural design is crucial. Under increasing loads, an axisymmetric structure (e.g., a column) reaches a critical load value (Pcr) at which its response can only take the form of two states in equilibrium. A purely compressed state without any lateral deflection or a purely deformed state (collapse).