Maximum Hoop Stress Evaluation of a Hollow Cylindrical Bulk Superconductor in Field-Cooled Magnetization

2014 ◽  
Vol 792 ◽  
pp. 15-20 ◽  
Author(s):  
Masanori Tsuchimoto
Keyword(s):  
Maxwell Equations ◽  
Hoop Stress ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Bulk Superconductor ◽  
Stress Evaluation ◽  
High Tc ◽  
High Tc Superconductor ◽  
Maximum Hoop Stress ◽  
The Finite Difference Method

Stresses are induced in a bulk high-Tc superconductor (HTS) by field-cooled magnetization. The stress distributions of a hollow cylindrical bulk HTS are numerically studied in the axisymmetric three-dimensional analysis. Shielding current distributions are obtained through a macroscopic numerical simulation with the Maxwell equations and the critical state model. Stress distributions are obtained by using the finite-difference method and iterative calculations. Maximum hoop stress during the field-cooled magnetization is discussed for open and fixed boundary conditions.

Geometric Constants in Plain Cross-Bored Cylinders

2003 ◽  
Vol 125 (4) ◽  
pp. 446-453 ◽  
Author(s):  
J. M. Kihiu ◽  
G. O. Rading ◽  
S. M. Mutuli
Keyword(s):  
Hoop Stress ◽  
Three Dimensional ◽  
Solution Technique ◽  
Thin Shells ◽  
Far Field ◽  
Stress Distributions ◽  
Maximum Hoop Stress ◽  
Thick Shells ◽  
Geometric Constants ◽  
Good Agreement

A three-dimensional FEM computer program was developed to establish the stress distributions and SCFs in thick walled cylinders with flush and nonprotruding plain cross bores under internal pressure. The displacement formulation and eight-noded brick isoparametric elements were used. The Frontal solution technique was used due to the limited computing facilities. In the far field, the FEM stresses and displacements were in good agreement with the through thickness analytical values. The variation of SCF with d was established for various thickness ratios. For k>1.25, the maximum hoop stress occurred away from the crotch corner when d⩽0.2. For k=1.25, the maximum hoop stress occurred away from the crotch corner when d⩽0.15. For k⩾1.75, d was found to be a geometrical constant equal to 0.2 where the k values have a SCF of 2.734. For k<1.75, d was found to be a geometrical constant equal to 0.11 where the k values have a SCF of 2.67. A new categorization of cylinders has been proposed: thin shells, thick shells, and thick cylinders.

Dimensioning of thick-walled spherical and cylindrical pressure vessels

2017 ◽  
Vol 25 (7) ◽  
pp. 1405-1415 ◽  
Author(s):  
Patrick Schneider ◽  
Reinhold Kienzler
Keyword(s):  
Hoop Stress ◽  
Classical Problem ◽  
Pressure Vessels ◽  
Combined Loading ◽  
Von Mises Stress ◽  
Absolute Maximum ◽  
Stress Distributions ◽  
Extensive Discussion ◽  
Maximum Hoop Stress ◽  
Von Mises

In this contribution, we revisit the rather classical problem of Lamé and provide a novel and easy way to plot the stress distributions and the overall absolute maximum von Mises stress for arbitrary parameters in only two diagrams. We also provide a maximum hoop stress formula for combined loading and an extensive discussion covering the accuracy of dimensioning via the maximum hoop stress instead of the maximum von Mises stress, as well as the accuracy of the classical approximative hoop stress formulas.

External Pressure Loading of Spiral Paper Tubes: Theory and Experiment

1990 ◽  
Vol 112 (2) ◽  
pp. 144-150 ◽  
Author(s):  
T. D. Gerhardt
Keyword(s):  
Hoop Stress ◽  
Tube Wall ◽  
Outer Wall ◽  
External Pressure ◽  
Isotropic Case ◽  
Stress Distributions ◽  
Elasticity Solution ◽  
Maximum Hoop Stress ◽  
Remarkable Agreement ◽  
Walled Cylinder

A closed-form elasticity solution is developed to predict stresses and strains in spiral paper tubes loaded axisymmetrically. No assumptions are made on stress distributions through the tube wall. Thus, the solution is valid for thick-walled tubes. The validity of this solution is established by comparison with experimental results. Measured strains in tubes subjected to external pressure showed remarkable agreement with the elasticity solution. After experimental verification, the elasticity solution is used to examine stress distributions in paper tubes loaded in external pressure. In both paper and isotropic tubes, the hoop stress dominates the other three stresses. However, the hoop stress distribution in paper tubes was radically different from the isotropic case. In paper tubes: (1) hoop stress was concentrated at the outer wall, especially for thicker tubes and (2) maximum hoop stress remained constant as tube thickness was increased. These differences can be attributed to the extremely small modulus in the radial direction of a paper tube. The hoop stress distributions indicate that isotropic, thick-walled cylinder theory is inapplicable for modeling paper tubes.

Deposition of High Tc Superconductor thin Films by Pulsed Laser Ablation

1987 ◽  
Vol 99 ◽  
Author(s):  
D. N. Mashburn ◽  
D. B. Geohegan ◽  
D. Eres ◽  
D. H. Lowndes ◽  
L. A. Boatner ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Bulk Superconductor ◽  
High Tc ◽  
High Tc Superconductor ◽  
Annealing Conditions ◽  
Excimer Laser Radiation ◽  
Superconductor Thin Films ◽  
Thin Superconducting Films

ABSTRACTThin superconducting films of YBa2Cu3O7 and HoBa2Cu3O7 have been obtained by ablating material from high-Tc bulk superconductor ceramics onto a nearby substrate using focused excimer laser radiation. Subsequent annealing in oxygen at elevated temperatures was necessary to achieve the superconducting phase. A range of deposition and annealing conditions was investigated to yield films of the desired stoi chiometry and phase.

Lower Bound Net-Section Limit Loads for Circumferential Part-Through Surface Cracked Pipes Under Combined Pressure and Bending

2007 ◽  
Author(s):  
Chang-Kyun Oh ◽  
Yun-Jae Kim ◽  
Jong-Sung Kim ◽  
Te-Eun Jin
Keyword(s):  
Hoop Stress ◽  
Plastic Material ◽  
Three Dimensional ◽  
Limit Load ◽  
Surface Cracks ◽  
Stress Distributions ◽  
Plastic Limit ◽  
Limit Loads ◽  
Perfectly Plastic ◽  
Elastic Perfectly Plastic

This paper provides plastic limit loads of pipes with constant-depth, circumferential part-through surface cracks under combined pressure and bending. A key issue is to postulate discontinuous hoop stress distributions in the net-section. Validity of the proposed limit load solutions are checked against the results from three-dimensional (3-D) finite element (FE) limit analyses using elastic-perfectly plastic material behaviour.

High resolution STEM imaging study on high Tc superconductor YBa2CuaO7-x

1988 ◽  
Vol 46 ◽  
pp. 882-883
Author(s):  
H.-J. Ou ◽  
J. M. Cowley
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Grain Boundary ◽  
Strong Field ◽  
Imaging Study ◽  
Structure Defects ◽  
High Tc ◽  
High Tc Superconductor ◽  
Diffraction Patterns ◽  
Lattice Planes

Using the dedicate VG-HB5 STEM microscope, the crystal structure of high Tc superconductor of YBa2Cu3O7-x has been studied via high resolution STEM (HRSTEM) imaging and nanobeam (∽3A) diffraction patterns. Figure 1(a) and 2(a) illustrate the HRSTEM image taken at 10' times magnification along [001] direction and [100] direction, respectively. In figure 1(a), a grain boundary with strong field contrast is seen between two crystal regions A and B. The grain boundary appears to be parallel to a (110) plane, although it is not possible to determine [100] and [001] axes as it is in other regions which contain twin planes [3]. Following the horizontal lattice lines, from left to right across the grain boundary, a lattice bending of ∽4° is noticed. Three extra lattice planes, indicated by arrows, were found to terminate at the grain boundary and form dislocations. It is believed that due to different chemical composition, such structure defects occur during crystal growth. No bending is observed along the vertical lattice lines.

Electron-Probe Quantitative Energy-Dispersive Analysis of Trace Magnesium Concentrations in Ag-Mg Alloys

1996 ◽  
Vol 54 ◽  
pp. 510-511
Author(s):  
R. B. Marinenko
Keyword(s):  
Electron Probe ◽  
Energy Dispersive Spectrometry ◽  
Mg Alloys ◽  
Energy Dispersive ◽  
Energy Dispersive Analysis ◽  
High Tc ◽  
Alloy Wire ◽  
High Tc Superconductor ◽  
Eds Analysis ◽  
Superior Mechanical Properties

Internally oxidized Ag-Mg alloys are used as sheaths for high Tc superconductor wires because of their superior mechanical properties. The preparation and characteristics of these materials have been reported. Performance of the sheaths depends on the concentration of the magnesium which generally is less than 0.5 wt. percent. The purpose of this work was to determine whether electron probe microanalysis using energy dispersive spectrometry (EDS) could be used to quantitate three different Ag-Mg alloys. Quantitative EDS analysis can be difficult because the AgL escape peak occurs at the same energy (1.25 keV) as the Mg Kα peak. An EDS spectrum of a Ag-Mg alloy wire is compared to a pure Ag spectrum in Fig. 1.

Evidence for magnetic organization of high Tc superconductor YBa 2 Cu8O7 observed by neutron diffraction

1987 ◽  
Vol 48 (10) ◽  
pp. 1623-1625 ◽  
Author(s):  
B. Farnoux ◽  
R. Kahn ◽  
A. Brulet ◽  
G. Collin ◽  
J.P. Pouget
Keyword(s):  
Neutron Diffraction ◽  
High Tc ◽  
High Tc Superconductor
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