Analysis of Local and Global Buckling of Thin-Walled Structures using a Higher Order Beam Model

2014 ◽  
Author(s):  
R.F. Vieira ◽  
F.B. Virtuoso ◽  
E.B.R. Pereira
Keyword(s):  
Higher Order ◽  
Beam Model ◽  
Thin Walled Structures ◽  
Global Buckling ◽  
Thin Walled

Buckling of thin-walled structures through a higher order beam model

2017 ◽  
Vol 180 ◽  
pp. 104-116 ◽  
Author(s):  
R.F. Vieira ◽  
F.B.E. Virtuoso ◽  
E.B.R. Pereira
Keyword(s):  
Higher Order ◽  
Beam Model ◽  
Thin Walled Structures ◽  
Thin Walled

scholarly journals A Simplified Approach to Identify Sectional Deformation Modes of Thin-Walled Beams with Prismatic Cross-Sections

2018 ◽  
Vol 8 (10) ◽  
pp. 1847 ◽  
Author(s):  
Lei Zhang ◽  
Weidong Zhu ◽  
Aimin Ji ◽  
Liping Peng
Keyword(s):  
Cross Sections ◽  
Three Dimensional ◽  
Higher Order ◽  
Basis Functions ◽  
Beam Model ◽  
Linear Superposition ◽  
Simplified Approach ◽  
Thin Walled Structures ◽  
Thin Walled ◽  
Deformation Modes

In this paper, a simplified approach to identify sectional deformation modes of prismatic cross-sections is presented and utilized in the establishment of a higher-order beam model for the dynamic analyses of thin-walled structures. The model considers the displacement field through a linear superposition of a set of basis functions whose amplitudes vary along the beam axis. These basis functions, which describe basis deformation modes, are approximated from nodal displacements on the discretized cross-section midline, with interpolation polynomials. Their amplitudes acting in the object vibration shapes are extracted through a modal analysis. A procedure similar to combining like terms is then implemented to superpose basis deformation modes, with equal or opposite amplitude, to produce primary deformation modes. The final set of the sectional deformation modes are assembled with primary deformation modes, excluding the ones constituting conventional modes. The derived sectional deformation modes, hierarchically organized and physically meaningful, are used to update the basis functions in the higher-order beam model. Numerical examples have also been presented and the comparison with ANSYS shell model showed its accuracy, efficiency, and applicability in reproducing three-dimensional behaviors of thin-walled structures.

Crushing behavior and crashworthiness optimization of multi-cell square tubes under multiple loading angles

2019 ◽  
Vol 234 (5) ◽  
pp. 1497-1511 ◽  
Author(s):  
Zhichao Li ◽  
Subhash Rakheja ◽  
Wen-Bin Shangguan
Keyword(s):  
Energy Absorption ◽  
Deformation Mode ◽  
High Energy ◽  
Absorption Efficiency ◽  
Absorption Capacity ◽  
Thin Walled Structures ◽  
Cell Structures ◽  
Global Buckling ◽  
Thin Walled ◽  
Crushing Behavior

Thin-walled structures are widely used as energy absorbers in automotive vehicles due to their lightweight and high-energy absorption efficiency. In order to improve the energy absorption characteristics of thin-walled structures subjected to different loading angles, different types of novel multi-cell structures are proposed in this paper. The numerical method is used to study the crushing behaviors of the proposed multi-cell structures under different loading angles. It is found that the proposed multi-cell structures have considerably small initial peak force under axial load and avoid the appearance of global buckling deformation mode under oblique loads. Moreover, reasonably distributed wall thickness for each square tube in the thin-walled structure can enhance its energy absorption capacity under different loading angles.

Definition of warping modes within the context of a higher order thin-walled beam model

2015 ◽  
Vol 147 ◽  
pp. 68-78 ◽  
Author(s):  
R.F. Vieira ◽  
F.B.E. Virtuoso ◽  
E.B.R. Pereira
Keyword(s):  
Higher Order ◽  
Beam Model ◽  
Thin Walled ◽  
Definition Of

A higher order thin-walled beam model including warping and shear modes

2013 ◽  
Vol 66 ◽  
pp. 67-82 ◽  
Author(s):  
R.F. Vieira ◽  
F.B.E. Virtuoso ◽  
E.B.R. Pereira
Keyword(s):  
Higher Order ◽  
Beam Model ◽  
Shear Modes ◽  
Thin Walled
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