Gobi Inclined Excavation Based Numerical Analysis

2013 ◽  
Vol 459 ◽  
pp. 631-636
Author(s):  
Li Qin ◽  
Hai Jian Zhang
Keyword(s):  
Numerical Analysis ◽  
Tilt Angle ◽  
Limit Load ◽  
Optimal Measure

Gobi inclined excavation foundation is based the advantages of good direct excavation, this paper mainly studied the angle inclined excavation foundation problems. Through the force, the size of the displacement, the optimal measure the tilt angle. And determine the limit load in the text.

Stable Platform Based on Workbench Vehicle Structure Analysis

2013 ◽  
Vol 477-478 ◽  
pp. 132-134
Author(s):  
Jin Xia Liu ◽  
Chong Chen ◽  
Liang Wang ◽  
Cong Zhang
Keyword(s):  
Numerical Analysis ◽  
Structural Analysis ◽  
Structure Analysis ◽  
Tilt Angle ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Vehicle Structure ◽  
Platform Tilt

This paper has conducted a structural analysis by workbench after establishing a stable platform for automotive three-dimensional model, primarily concerning whether the platform can provide a benchmark to meet the requirements of equipment, including the numerical analysis of whether the platform tilt angle under load can achieve the requirements as well as the scheme of improvement direction of the structure.

scholarly journals A Numerical Analysis of Selected Elastic-Plastic Fracture Parameters for DEN(T) Plates under Plane Strain Conditions

2017 ◽  
Vol 22 (1) ◽  
pp. 49-80 ◽  
Author(s):  
M. Graba
Keyword(s):  
Numerical Analysis ◽  
Fracture Mechanics ◽  
Plane Strain ◽  
Plastic Material ◽  
Crack Tip ◽  
Limit Load ◽  
Material Model ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Elastic Plastic

Abstract This paper provides a numerical analysis of selected parameters of fracture mechanics for double-edge notched specimens in tension, DEN(T), under plane strain conditions. The analysis was performed using the elastic-plastic material model. The study involved determining the stress distribution near the crack tip for both small and large deformations. The limit load solution was verified. The J-integral, the crack tip opening displacement, and the load line displacement were determined using the numerical method to propose the new hybrid solutions for calculating these parameters. The investigations also aimed to identify the influence of the plate geometry and the material characteristics on the parameters under consideration. This paper is a continuation of the author’s previous studies and simulations in the field of elastic-plastic fracture mechanics [4, 6, 16, 17, 31].

scholarly journals A PROJECTION APPROACH TO THE NUMERICAL ANALYSIS OF LIMIT LOAD PROBLEMS

2011 ◽  
Vol 21 (06) ◽  
pp. 1291-1316 ◽  
Author(s):  
GUILLAUME CARLIER ◽  
MYRIAM COMTE ◽  
IOAN IONESCU ◽  
GABRIEL PEYRÉ
Keyword(s):  
Numerical Analysis ◽  
Gradient Descent ◽  
Numerical Scheme ◽  
Limit Load ◽  
Deformation Field ◽  
Dual Formulation ◽  
Strictly Convex ◽  
Convex Perturbation ◽  
Projection Approach

This paper proposes a numerical scheme to approximate the solution of (vectorial) limit load problems. The method makes use of a strictly convex perturbation of the problem, which corresponds to a projection of the deformation field under bounded deformation and incompressibility constraints. The discretized formulation of this perturbation converges to the solution of the original landslide problem when the amplitude of the perturbation tends to zero. The projection is computed numerically with a multi-step gradient descent on the dual formulation of the problem.

scholarly journals Analysis of Brace Stiffness Influence on Stability of the Truss

2015 ◽  
Vol 20 (1) ◽  
pp. 97-108 ◽  
Author(s):  
M. Krajewski ◽  
P. Iwicki
Keyword(s):  
Numerical Analysis ◽  
Normal Force ◽  
Limit Load ◽  
Load Bearing Capacity ◽  
Elastic Supports ◽  
Roof Truss ◽  
Eurocode 3 ◽  
Linear Buckling ◽  
Buckling Length ◽  
Linear Buckling Analysis

Abstract The paper is devoted to the numerical and experimental research of stability of a truss with side elastic supports at the top chord. The structure is a model of a real roof truss scaled by factor ¼. The linear buckling analysis and non-linear static analysis were carried out. The buckling length factor for the compressed top chord was calculated and the limit load for the imperfect truss shell model with respect to brace stiffness was obtained. The relation between brace normal force and loading of the truss is presented. The threshold stiffness of braces necessary to obtain the maximum buckling load was found. The truss load bearing capacity obtained from numerical analysis was compared with Eurocode 3 requirements.

Three-Dimensional Analysis of Natural Convection in a Toroidal Loop: Effect of Tilt Angle

1986 ◽  
Vol 108 (4) ◽  
pp. 796-805 ◽  
Author(s):  
A. S. Lavine ◽  
R. Greif ◽  
J. A. C. Humphrey
Keyword(s):  
Natural Convection ◽  
Numerical Analysis ◽  
Dimensional Analysis ◽  
Tilt Angle ◽  
Axial Velocity ◽  
Three Dimensional ◽  
Wall Friction ◽  
Buoyancy Forces ◽  
Secondary Motion ◽  
Flow Reversals

A three-dimensional numerical analysis of natural convection in a toroidal thermosyphon has been performed. The results confirm the experimental observations of three dimensionality, streamwise flow reversal, and secondary motion. The flow reversals reduce the wall friction and buoyancy forces, and consequently have a strong effect on the average axial velocity.

The dislocation structure of a 10° [110] tilt boundary in silicon

1983 ◽  
Vol 41 ◽  
pp. 114-115
Author(s):  
B. Cunningham ◽  
D.G. Ast
Keyword(s):  
Dislocation Structure ◽  
Tilt Angle ◽  
Imaging Technique ◽  
Diamond Lattice ◽  
Tilt Boundary ◽  
Formation Mechanisms ◽  
Diffraction Contrast ◽  
Lattice Fringe ◽  
Tilt Boundaries ◽  
Chemically Vapor Deposited

There have Been a number of studies of low-angle, θ < 4°, [10] tilt boundaries in the diamond lattice. Dislocations with Burgers vectors a/2<110>, a/2<112>, a<111> and a<001> have been reported in melt-grown bicrystals of germanium, and dislocations with Burgers vectors a<001> and a/2<112> have been reported in hot-pressed bicrystals of silicon. Most of the dislocations were found to be dissociated, the dissociation widths being dependent on the tilt angle. Possible dissociation schemes and formation mechanisms for the a<001> and a<111> dislocations from the interaction of lattice dislocations have recently been given.The present study reports on the dislocation structure of a 10° [10] tilt boundary in chemically vapor deposited silicon. The dislocations in the boundary were spaced about 1-3nm apart, making them difficult to resolve by conventional diffraction contrast techniques. The dislocation structure was therefore studied by the lattice-fringe imaging technique.

A High Angle, Double Tilting Cold Stage for the AEI EM7

1974 ◽  
Vol 32 ◽  
pp. 450-451
Author(s):  
P.R. Swann ◽  
A.E. Lloyd
Keyword(s):  
Habit Plane ◽  
Temperature Control ◽  
Tilt Angle ◽  
Cooling System ◽  
Thermal Drift ◽  
High Angle ◽  
Cold Stage ◽  
High Degree ◽  
Better Than

Figure 1 shows the design of a specimen stage used for the in situ observation of phase transformations in the temperature range between ambient and −160°C. The design has the following features a high degree of specimen stability during tilting linear tilt actuation about two orthogonal axes for accurate control of tilt angle read-out high angle tilt range for stereo work and habit plane determination simple, robust construction temperature control of better than ±0.5°C minimum thermal drift and transmission of vibration from the cooling system.

The use of a Bent Grid to Improve the take-Off Angle for Electron Probe Analysis

1976 ◽  
Vol 34 ◽  
pp. 360-361
Author(s):  
Delbert E. Philpott ◽  
David Leaffer
Keyword(s):  
Quantitative Analysis ◽  
Tilt Angle ◽  
Count Rate ◽  
Electron Probe ◽  
Open Area ◽  
Electron Probe Analysis ◽  
Background Ratio ◽  
Probe Analysis

There are certain advantages for electron probe analysis if the sample can be tilted directly towards the detector. The count rate is higher, it optimizes the geometry since only one angle need be taken into account for quantitative analysis and the signal to background ratio is improved. The need for less tilt angle may be an advantage because the grid bars are not moved quite as close to each other, leaving a little more open area for observation. Our present detector (EDAX) and microscope (Philips 300) combination precludes moving the detector behind the microscope where it would point directly at the grid. Therefore, the angle of the specimen was changed in order to optimize the geometry between the specimen and the detector.

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