Neutron depolarization study of internal stresses in amorphous Fe40Ni40B20

1997 ◽  
Vol 81 (9) ◽  
pp. 6000-6012 ◽  
Author(s):  
M. de Jong ◽  
J. Sietsma ◽  
M. Th. Rekveldt ◽  
A. van den Beukel
Keyword(s):  
Internal Stresses ◽  
Amorphous Fe40ni40b20 ◽  
Neutron Depolarization

Internal stresses in amorphous Fe40Ni40B20 studied with neutron depolarization

1994 ◽  
Vol 75 (1-4) ◽  
pp. 91-100 ◽  
Author(s):  
M. de Jong ◽  
A. van Oudenaarden ◽  
J. Sietsma ◽  
M. Th. Rekveldt ◽  
A. van den Beukel
Keyword(s):  
Internal Stresses ◽  
Amorphous Fe40ni40b20 ◽  
Neutron Depolarization

The relaxation of internal stresses during annealing of amorphous Fe40Ni40B20

1994 ◽  
Vol 179-180 ◽  
pp. 341-345 ◽  
Author(s):  
M. de Jong ◽  
J. Sietsma ◽  
M.Th. Rekveldt ◽  
A. van den Beukel
Keyword(s):  
Internal Stresses ◽  
Amorphous Fe40ni40b20

A neutron depolarization study of stress-annealed amorphous Fe40Ni40B20

1996 ◽  
Vol 152 (3) ◽  
pp. 326-340 ◽  
Author(s):  
M. de Jong ◽  
L. Köszegi ◽  
J. Sietsma ◽  
M.Th. Rekveldt ◽  
A. van den Beukel
Keyword(s):  
Amorphous Fe40ni40b20 ◽  
Neutron Depolarization

Internal stress distribution in amorphous Fe40Ni40B20 studied by field dependent neutron depolarization

1994 ◽  
Vol 133 (1-3) ◽  
pp. 251-254 ◽  
Author(s):  
A. van Oudenaarden ◽  
M. de Jong ◽  
J. Sietsma ◽  
M.Th. Rekveldt ◽  
A. van den Beukel
Keyword(s):  
Stress Distribution ◽  
Internal Stress ◽  
Field Dependent ◽  
Amorphous Fe40ni40b20 ◽  
Neutron Depolarization

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

DOMAIN STRUCTURE STUDIES OF HARDMAGNETIC MATERIALS BY NEUTRON DEPOLARIZATION

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-665-C8-666 ◽  
Author(s):  
G. Badurek ◽  
R. Giersig ◽  
R. Grössinger ◽  
A. Veider ◽  
H. Weinfurter
Keyword(s):  
Domain Structure ◽  
Neutron Depolarization

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

Equilibrium Profile of Modern Belted Radial Ply Tires: Its Determination and Performance Benefits

2013 ◽  
Vol 41 (2) ◽  
pp. 127-151
Author(s):  
Rudolf F. Bauer
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Finite Element Methods ◽  
Mathematical Analysis ◽  
Internal Stresses ◽  
Stress Concentrations ◽  
Equilibrium Profiles ◽  
Equilibrium Profile ◽  
And Performance ◽  
Beneficial Property

ABSTRACT The benefits of a tire's equilibrium profile have been suggested by several authors in the published literature, and mathematical procedures were developed that represented well the behavior of bias ply tires. However, for modern belted radial ply tires, and particularly those with a lower aspect ratio, the tire constructions are much more complicated and pose new problems for a mathematical analysis. Solutions to these problems are presented in this paper, and for a modern radial touring tire the equilibrium profile was calculated together with the mold profile to produce such tires. Some construction modifications were then applied to these tires to render their profiles “nonequilibrium.” Finite element methods were used to analyze for stress concentrations and deformations within all tires that did or did not conform to equilibrium profiles. Finally, tires were built and tested to verify the predictions of these analyses. From the analysis of internal stresses and deformations on inflation and loading and from the actual tire tests, the superior durability of tires with an equilibrium profile was established, and hence it is concluded that an equilibrium profile is a beneficial property of modern belted radial ply tires.

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