TWLIGHT-IITM—A Computational Utility for Elastic Buckling Stress Predictions of Cold-Formed Steel Elements

2018 ◽  
pp. 389-401
Author(s):  
S. S. Ajeesh ◽  
S. Arul Jayachandran
Keyword(s):  
Elastic Buckling ◽  
Buckling Stress ◽  
Cold Formed Steel

Influence of Defects on Elastic Buckling Properties of Single-Layered Graphene Sheets

2014 ◽  
Vol 636 ◽  
pp. 11-14 ◽  
Author(s):  
Bao Long Li ◽  
Li Jun Zhou ◽  
Jian Gao Guo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vacancy Defect ◽  
Elastic Buckling ◽  
Graphene Sheets ◽  
Effect Factors ◽  
Vacancy Defects ◽  
Size Dependent ◽  
Buckling Stress ◽  
Geometrical Dimensions

Molecular structural mechanics based finite element method has been applied to study the effects of two types of Stone-Wales (SW) defects and vacancy defect on elastic buckling properties of single-layered graphene sheets (SLGSs). The defect effect factors of critical buckling stresses are calculated for the defective SLGSs with different chirality and geometrical dimensions. It is proved that defect effect factors are size-dependent and chirality-dependent. The results show that the vacancy defects will always weaken the SLGSs’ stability, and two types of SW defects have different effects on zigzag and armchair SLGSs. What’s more, the positions of defects also have remarkable influence on the critical buckling stress of SLGSs.

The Theoretical Investigation on Critical Buckling Stress of Graphene Nanosheets

2016 ◽  
Vol 859 ◽  
pp. 79-84
Author(s):  
Li Jun Zhou ◽  
Jian Gao Guo ◽  
Bao Long Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Graphene Nanosheets ◽  
Structural Mechanics ◽  
Elastic Buckling ◽  
Boundary Constraints ◽  
Buckling Stress ◽  
Good Consistency ◽  
Analytical Expressions ◽  
Geometrical Dimensions

The elastic buckling behaviors of graphene nanosheets are investigated via molecular structural mechanics based finite element method. The size-and chirality-dependent critical buckling stresses of monolayer and bilayer graphene nanosheets are calculated for different geometrical dimensions and boundary constraints, respectively. By analogy with classical buckling theory of elastic plate, the analytical expressions of critical buckling stress are derived for the graphene nanosheets with different boundary constraints, and the comparisons of analytical results with the counterparts obtained by molecular structural mechanics simulation show a good consistency.

scholarly journals Flexural Elastic Buckling Stress of Batten Type Light Gauge Built-Up Member

2017 ◽  
Vol 25 (2) ◽  
pp. 161-172 ◽  
Author(s):  
Kazuya Mitsui ◽  
Atsushi Sato
Keyword(s):  
Slenderness Ratio ◽  
Shear Wall ◽  
Elastic Buckling ◽  
Test Results ◽  
Current Standard ◽  
Buckling Strength ◽  
Buckling Stress ◽  
Strength Based ◽  
Energy Equilibrium ◽  
Compression Member

Abstract In Japan, built-up member composed with light gauge is used for studs of shear wall. Flexural buckling stress of built-up compression member is evaluated by effective slenderness ratio. The effective slenderness ratio of light gauge built-up compression member is proposed for heavy sections; however, it is not verified that it can be adopted in light gauge. In this paper, full scale testing of light gauge built-up members are conducted. From the test results, it is shown that current Standard overestimates the buckling strength. Based on energy equilibrium theory, modified effective slenderness ratio for light gauge built-up member is derived. The validity of the modified effective slenderness ratio is shown with test results.

Estimation of Elastic Buckling Strength of a Non-Spherical Tank in the Partially Filled Condition

2017 ◽  
Author(s):  
Atsushi Sano ◽  
Naoya Matsubara ◽  
Naruyoshi Izumi ◽  
Masahiko Fujikubo
Keyword(s):  
Strength Analysis ◽  
Toroidal Shell ◽  
Elastic Buckling ◽  
Stress Distributions ◽  
Element Analysis ◽  
Initial Shape ◽  
Buckling Strength ◽  
Buckling Stress ◽  
Spherical Tank ◽  
Shell Finite Element

A method of estimating elastic buckling strength of a non-spherical tank intended for the use in LNG carriers is presented. Partially filled condition that causes combined meridional tension and circumferential compression is considered. Analytical expression of pre-buckling stress distributions is derived based on membrane shell theory. These stresses are applied to the elastic buckling strength analysis employing Hutchinson’s solution for a toroidal shell segment under similar stress condition. The buckling strength of a spherical shell is highly sensitive to initial shape imperfections, but these are not considered as a most fundamental case. The predicted stress distributions and elastic buckling strength are compared with those calculated by the 3D shell finite element analysis.

Simulation of Cold-Formed Steel Beams in Global and Distortional Buckling

2014 ◽  
Vol 633-634 ◽  
pp. 1037-1041 ◽  
Author(s):  
Nikolay Vatin ◽  
Aleksei Sinelnikov ◽  
Marsel Garifullin ◽  
Darya Trubina
Keyword(s):  
Fe Simulation ◽  
Critical Force ◽  
Steel Beams ◽  
Elastic Buckling ◽  
Distortional Buckling ◽  
Pure Bending ◽  
Buckling Modes ◽  
New Type ◽  
Cold Formed Steel ◽  
Computing Simulation

This article provides the numerical elastic buckling analysis of simply supported cold-formed lipped channels subjected to pure bending. A methodology for computing simulation of a new type of thin-walled thermo-profile (reticular-stretched) is developed. For flexural elements buckling modes and values of critical force are calculated. FE simulation evaluates the influence of web height and span on the critical load and buckling modes for cold formed beams of different lengths.

Buckling of Thin Cylindrical Shell Under Hoop Stresses Varying in Axial Direction

1957 ◽  
Vol 24 (3) ◽  
pp. 405-412
Author(s):  
N. J. Hoff
Keyword(s):  
Cylindrical Shell ◽  
Thermal Stresses ◽  
Axial Direction ◽  
Elastic Buckling ◽  
Thin Cylindrical Shell ◽  
Simply Supported ◽  
Buckling Stress ◽  
Compressive Stresses ◽  
Hoop Stresses ◽  
Approximate Formulas

Abstract The buckling of a thin cylindrical shell simply supported along the perimeter of its end sections is analyzed under hoop compressive stresses varying in the axial direction. The thermal stresses arising from a uniform increase in the temperature of the cylinder are determined. It is found that such thermal stresses are not likely to cause elastic buckling. Simple approximate formulas are developed for buckling stress and thermal stress.

Elastic Critical Buckling Modes and Stress of Cold-Formed Thin-Walled Lipped Channel with Multiple Intermediate Stiffeners

2014 ◽  
Vol 501-504 ◽  
pp. 470-473
Author(s):  
Guang Yue Ma
Keyword(s):  
Theoretical Analysis ◽  
Experimental Results ◽  
Elastic Buckling ◽  
Channel Member ◽  
Buckling Modes ◽  
Important Thing ◽  
Buckling Stress ◽  
Thin Walled

Elastic buckling modes of cold-formed thin-walled steel member have three relevant types: local, distortional and global. The complicated and important thing is to differentiating buckling modes and resolving buckling stress for engineers. It will be given for Cold-formed thin-walled lipped channel member with multiple intermediate stiffeners. The theoretical analysis coincide exactly with the experimental results, it can be used as a reference for engineers.

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