Effect of the Casimir Force on Buckling of a Double-Nanowire System with Surface Effects

2018 ◽  
Vol 18 (10) ◽  
pp. 1850118 ◽  
Author(s):  
J. Zou ◽  
X.-F. Li
Keyword(s):  
Surface Tension ◽  
Carrying Capacity ◽  
Critical Loads ◽  
Casimir Force ◽  
Surface Elasticity ◽  
Surface Effects ◽  
Load Carrying Capacity ◽  
Governing Equations ◽  
Simply Supported ◽  
Load Carrying

Structural stability of a double-nanowire system with surface effects subjected to axial compressive forces is analyzed. Taking into account the Casimir force between the two nanowires, two coupled governing equations for buckling of a double-nanowire system are derived. For four typical end supports including simply-supported, clamped, cantilevered, and clamped-pinned double-nanowire systems, the characteristic equations are derived and the critical loads are determined for the out-of-phase in-plane buckling. Numerical results indicate that positive surface elasticity enhances the load-carrying capacity of the nanowires, and the reverse is also true. The Casimir force and residual surface tension always increase the critical loads.

Elastic Deformation Effects on the Thermo-Hydrodynamic Aspect of Porous Journal Bearings

2014 ◽  
Vol 353 ◽  
pp. 275-279
Author(s):  
S. Boubendir ◽  
Salah Larbi ◽  
R. Bennacer
Keyword(s):  
Elastic Deformation ◽  
Carrying Capacity ◽  
Reynolds Equation ◽  
Maximum Pressure ◽  
Load Carrying Capacity ◽  
Static Characteristics ◽  
Governing Equations ◽  
Load Carrying ◽  
Variation Parameter ◽  
Viscosity Variation

In this paper, the effects of porous bush elastic deformation on the static characteristics of finite porous journal bearing are investigated using Darcy’s law. The modified Reynolds equation applied to thermo-hydrodynamic problems is modified by considering the viscosity variation along the film thickness. The film pressure distribution and other characteristics such as the load carrying capacity and attitude angle are obtained by solving the governing equations numerically. Obtained results showed that deformation is considerable in the maximum pressure zone, and the elastic deformation will decrease the load carrying capacity. The viscosity variation parameter tends also to decrease the load carrying capacity.

Analytical Solutions for Incompressible Spiral Groove Viscous Pumps

1974 ◽  
Vol 96 (3) ◽  
pp. 365-369 ◽  
Author(s):  
F. C. Hsing
Keyword(s):  
Carrying Capacity ◽  
Thrust Bearing ◽  
Present Theory ◽  
Load Carrying Capacity ◽  
Governing Equations ◽  
Spiral Groove ◽  
Design Charts ◽  
Load Carrying ◽  
Analytical Expressions ◽  
Dynamic Perturbation

Exact solutions for a class of incompressible spiral-grooved viscous pumps were obtained by solving the dynamic perturbation equations based on the governing equations of the well-known narrow groove theory. The resulting closed-form analytical expressions contain two integration constants which can be determined by appropriate boundary conditions pertinent to a specific application and design. A flat thrust bearing was chosen to illustrate the application of these results. The load-carrying capacity calculated from present theory was compared with those obtained by other investigator [2]. The agreement is extremely good. No attempt was made to generate design charts for various designs since the resulting expressions obtained in this work can be used quite easily in a straightforward fashion.

scholarly journals OPTIMIZATION OF SIMPLY SUPPORTED CASTELLATED I-BEAMS LOADED BY A UNIFORMLY DISTRIBUTED LOAD

2019 ◽  
Vol 15 (4) ◽  
pp. 58-65
Author(s):  
Oleg Goryachevskiy
Keyword(s):  
Carrying Capacity ◽  
Descent Method ◽  
Geometric Parameters ◽  
Load Carrying Capacity ◽  
Coordinate Descent Method ◽  
Simply Supported ◽  
Distributed Load ◽  
Load Carrying ◽  
The Stability ◽  
Plastic Steel

The paper discusses the problem of optimizing the geometric parameters of simply supported I-beams in order to maximize their load carrying capacity. Numerical simulation of various types of failure of castellated I- beams with ideal elastic-plastic steel is carried out. The stability of the wall, the strength of the welds and flanges, depending on the geometric parameters investigated. Using the coordinate descent method, the optimization prob­lem is solved for nine design schemes with respect to the section height and the weld length. It was revealed that in short beams the section height should be less and the weld length longer, in contrast to long beams.

The Thermally Boosted Oil Lubricated Sliding Thrust Bearing

1974 ◽  
Vol 96 (3) ◽  
pp. 322-328 ◽  
Author(s):  
C. M. Rodkiewicz ◽  
J. C. Hinds ◽  
C. Dayson
Keyword(s):  
Boundary Conditions ◽  
Carrying Capacity ◽  
Thrust Bearing ◽  
Load Carrying Capacity ◽  
Slider Bearing ◽  
Governing Equations ◽  
Temperature Ratio ◽  
Thrust Bearings ◽  
Temperature Boundary ◽  
Load Carrying

The effect of varying the ratio of slider to pad temperature boundary conditions and the influence of varying inlet to outlet ratio of a plane infinitely wide slider bearing is examined. The lubricant is assumed to be incompressible and the variation of viscosity with temperature is taken into account. The nondimensionalized governing equations, transformed in terms of the stream function, are solved numerically. The results show that maintaining a lower slider temperature to pad temperature ratio causes an increase in the load carrying capacity of the bearing. A means of which advantage could be taken of this effect in the design of thrust bearings is suggested.

Stability Analysis for a Single-Layer Reticulated Shell

2014 ◽  
Vol 614 ◽  
pp. 635-639
Author(s):  
Jin Duan ◽  
Jun Cong ◽  
Guo Jun Feng ◽  
Bing Lin
Keyword(s):  
Stability Analysis ◽  
Carrying Capacity ◽  
Critical Loads ◽  
Full Range ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
Range Analysis ◽  
Buckling Modes ◽  
Load Carrying ◽  
Linear Buckling

A stability analysis for a single-layer reticulated shell is presented in this paper. The structural buckling modes and critical loads are calculated first. A preliminary security examination is presented based on the results of linear buckling anasys. And then the load-carrying capacity of this structure would be calculated through the geometric nonlinear full-range analysis. Finally a conclusion is deduced that the stable bearing capacity of this structure has met the requirements of the specification.

scholarly journals Crack morphology and load carrying capacity of the deep beams reinforced orthogonally

2014 ◽  
Vol 13 (3) ◽  
pp. 127-134
Author(s):  
Krystyna Nagrodzka-Godycka ◽  
Anna Knut ◽  
Kamila Zmuda-Baszczyn
Keyword(s):  
Carrying Capacity ◽  
Spatial Arrangement ◽  
The Other ◽  
Load Carrying Capacity ◽  
Deep Beam ◽  
Deep Beams ◽  
Simply Supported ◽  
Crack Morphology ◽  
Load Carrying ◽  
The One

The paper presents the results of experimental study carried out by authors on the deep beams with cantilever which was loaded throughout the depth. The main deep beam was directly simply supported on the one side. On the other side the deep beam was suspended in another deep member situated at right angles. All deep beams created a spatial arrangement. The tested deep beams were reinforced orthogonally. Crack patterns and the mode of the failure as well shear concrete were analyzed for their influence on load carrying capacity of the deep beams.

Influence of Yield Strength Variability over Cross-Section to Steel Beam Load-Carrying Capacity

2005 ◽  
Vol 10 (2) ◽  
pp. 151-160 ◽  
Author(s):  
J. Kala ◽  
Z. Kala
Keyword(s):  
Yield Strength ◽  
Cross Section ◽  
Carrying Capacity ◽  
Bending Moment ◽  
Statistical Characteristics ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Strength Variability ◽  
Hot Rolled ◽  
Hot Rolled Steel

Authors of article analysed influence of variability of yield strength over cross-section of hot rolled steel member to its load-carrying capacity. In calculation models, the yield strength is usually taken as constant. But yield strength of a steel hot-rolled beam is generally a random quantity. Not only the whole beam but also its parts have slightly different material characteristics. According to the results of more accurate measurements, the statistical characteristics of the material taken from various cross-section points (e.g. from a web and a flange) are, however, more or less different. This variation is described by one dimensional random field. The load-carrying capacity of the beam IPE300 under bending moment at its ends with the lateral buckling influence included is analysed, nondimensional slenderness according to EC3 is λ¯ = 0.6. For this relatively low slender beam the influence of the yield strength on the load-carrying capacity is large. Also the influence of all the other imperfections as accurately as possible, the load-carrying capacity was determined by geometrically and materially nonlinear solution of very accurate FEM model by the ANSYS programme.

Sign in / Sign up

Export Citation Format

Share Document