scholarly journals Modified elastic solution method in solving elastoplastic problems of structure components subjected to complex loading

2000 ◽  
Vol 22 (3) ◽  
pp. 133-148
Author(s):  
Dao Huy Bich
Keyword(s):  
Solution Method ◽  
Complex Loading ◽  
Elastic Solution ◽  
Process Theory ◽  
Axially Symmetric ◽  
Bodies Of Revolution ◽  
Elastoplastic Process ◽  
Symmetric Load ◽  
2D And 3D ◽  
Made In

Modified elastic solution method in the elastoplastic process theory has been proposed by the author [2] and was applied in solving some 2D and 3D elastoplastic problems of structure components subjected to complex loading. The method makes use of an algorithm in which a step is made in the loading process and iterations are carried out on this step. The performance of the method was fulfilled and the convergence of the method was considered numerically. In this paper the other performance of this method is presented and the convergence of the method is proven theoretically in the general case of a hardening body which obeys the elastoplastic process theory. The more complicated 3D problem of bodies of revolution subjected to non-axially symmetric load is investigated.

Elasto-plastic state of curve beam system subjected to complex loading

1996 ◽  
Vol 18 (4) ◽  
pp. 14-22
Author(s):  
Vu Khac Bay
Keyword(s):  
Cylindrical Shell ◽  
Solution Method ◽  
Complex Loading ◽  
Numerical Results ◽  
Elastic Solution ◽  
Plastic State ◽  
Curve Beam ◽  
Elastic State ◽  
Elastic Plastic ◽  
Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

Structural Analysis and Internal Force Calculation of Variable Cross-Section Silo

2012 ◽  
Vol 446-449 ◽  
pp. 429-434
Author(s):  
Rui Ting Ma
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Internal Force ◽  
Variable Cross ◽  
Axially Symmetric ◽  
Internal Forces ◽  
Differential Element ◽  
Symmetric Load ◽  
Force Calculation ◽  
Constant Section

In this paper, the differential element of constant-section silo wall suffering from axially symmetric load is analyzed. From the results of constant-section silo, the author derives the displacements and internal forces of variable cross-section silo. Through a specific example, this paper compares the displacements , internal forces and concrete consumption of variable cross-section silo with those of constant-section silo, and discusses the merits of variable cross-section silo.

An analytical model of an I-cored coil located above a conductive material with a hole

2018 ◽  
Vol 82 (2) ◽  
pp. 21001
Author(s):  
Grzegorz Tytko ◽  
Leszek Dziczkowski
Keyword(s):  
Test Object ◽  
Middle Layer ◽  
Axially Symmetric ◽  
The Finite Element Method ◽  
Cylindrical Coordinate ◽  
Air Space ◽  
Through Hole ◽  
Tree Method ◽  
Good Agreement ◽  
Made In

The paper examines the problem of an axially symmetric I-cored coil located above a three-layered plate with a hole in the middle layer. A cylindrical coordinate system was applied, wherein the solution domain was truncated in the radial direction. The employment of the truncated region eigenfunction expansion (TREE) method resulted in deriving the final formulas for the change of the coil impedance with regard to the air space, and also pertaining to the test object without a flaw. Formulas for various configurations of the test object, among others for a surface hole, a subsurface hole and a through hole, have been presented. For the purpose of defectoscopy, the influence of the hole in the plate on the impedance components was investigated. The calculations were made in Matlab for frequencies from 100 Hz to 50 kHz. The obtained results were verified using the finite element method (FEM) in Comsol Multiphysics package. A very good agreement was observed in the case of both the resistance and reactance.

Sensing behavior of perovskites GdCo1−xCuxO3 prepared by solution and ultrasonic-assisted aerosol methods.

2004 ◽  
Vol 828 ◽  
Author(s):  
Carlos R. Michel ◽  
Edgar R. López ◽  
Arturo Chávez
Keyword(s):  
Aqueous Solutions ◽  
Solution Method ◽  
Spherical Particles ◽  
Electrical Measurements ◽  
Gas Sensitivity ◽  
Semiconductor Behavior ◽  
Ultrasonic Assisted ◽  
Method Yield ◽  
Precursor Powders ◽  
Made In

ABSTRACTPolycrystalline samples of GdCo1−xCuxO3 (x=0, 0.15, 0.3), were prepared by two different routes: solution and ultrasonic-assisted aerosol decomposition. For both procedures, aqueous solutions containing stoichiometric amounts of Gd(NO3)36H2O, Co(NO3)26H2O and Cu(NO3)22.5H2O were used. In the solution method, the aqueous solutions were heat-dried at 76°C obtaining precursor powders, these were calcined from 80 to 950°C, in air. In the aerosol method, very small droplets were produced by an ultrasonic generator, then a flow of oxygen transported the mist through a tubular furnace, previously heated at 950°C. Solvent evaporation and chemical reaction takes place at that temperature, and the resulting powder was collected by filtration. X-ray powder diffraction was used to identify the formation of target phases. Surface microstructure of powders was analyzed by SEM, and showed that solution method produced sub-micron particles with irregular shape, whereas the aerosol method yield micron-sized hollow spherical particles. In order to determine gas sensitivity vs. temperature, electrical measurements were made in air, O2 and CO2, from room temperature to 650°C. The results showed a semiconductor behavior and a moderate gas sensitivity for samples prepared by solution method. However, unreliable data were registered for samples made by the aerosol route, caused by short connectivity between particles.

The subsurface temperature assessment by means of an indirect electromagnetic geothermometer

Geophysics ◽  
2012 ◽  
Vol 77 (4) ◽  
pp. WB179-WB190 ◽  
Author(s):  
Viacheslav Spichak ◽  
Olga Zakharova
Keyword(s):  
Tien Shan ◽  
Rock Properties ◽  
Subsurface Temperature ◽  
Fluid Circulation ◽  
Estimation Errors ◽  
Temperature Estimation ◽  
Two Factors ◽  
2D And 3D ◽  
Transfer Mechanisms ◽  
Made In

Advances have been made in the subsurface temperature estimation basing on the indirect electromagnetic geothermometer. The approach used was based on the artificial neural network technique, which, contrary to other available approaches, does not imply the prior knowledge of the electrical conductivity mechanisms and rock properties. Application of the indirect EM geothermometer to the interwell space interpolation in three areas (Tien Shan, Kyrgyzstan; Soultz-sous-Forêts, France; and Hengill, Iceland) characterized by different geologic environments indicated that the temperature estimation errors are controlled by four factors: faulting, distance between the EM site and the area where the temperature is estimated, meteoric and groundwater flows, and lateral geologic inhomogeneity (although the latter factor is less restrictive if appropriate EM inversion tools are used). It was demonstrated that the extrapolation errors depend on two factors: spacing between the EM site and the borehole, and ratio between the well length and the extrapolation depth. In particular, the relative accuracy of the temperature extrapolation to the depths twice as large as the borehole depth did not exceed an average of 5%. Using the indirect EM geothermometer, it was possible to reconstruct 2D and 3D temperature models of the studied areas from EM sounding data, which, in turn, enabled us to draw important conclusions regarding the dominating heat transfer mechanisms, fluid circulation paths, and better locations for drilling new boreholes. Application of the indirect EM geothermometer during exploitation of the geothermal reservoirs may enable one to monitor the variations of subsurface temperatures basing on the ground EM monitoring data and forecast future trends.

scholarly journals Slowly Vibrating Axially Symmetric Bodies-Transverse Flow

2021 ◽  
Vol 26 (1) ◽  
pp. 226-250
Author(s):  
D.K. Srivastava
Keyword(s):  
Newtonian Fluid ◽  
Circular Disk ◽  
Transverse Flow ◽  
Axially Symmetric ◽  
Frictional Drag ◽  
Bodies Of Revolution ◽  
Shaped Body ◽  
Stokes Drag ◽  
Axis Of Symmetry

AbstractStokes drag on axially symmetric bodies vibrating slowly along the axis of symmetry placed under a uniform transverse flow of the Newtonian fluid is calculated. The axially symmetric bodies of revolution are considered with the condition of continuously turning tangent. The results of drag on sphere, spheroid, deformed sphere, egg-shaped body, cycloidal body, Cassini oval, and hypocycloidal body are found to be new. The numerical values of frictional drag on a slowly vibrating needle shaped body and flat circular disk are calculated as particular cases of deformed sphere.

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