Theoretical and Experimental Investigation of the Nonlinear Torsion and Extension of Initially Twisted Bars

1983 ◽  
Vol 50 (2) ◽  
pp. 321-326 ◽  
Author(s):  
A. Rosen
Keyword(s):  
Experimental Investigation ◽  
Nonlinear Equations ◽  
Cross Sections ◽  
Nonlinear Deformation ◽  
Experimental Results ◽  
Tension Force ◽  
Torsional Moment ◽  
Steel Strips ◽  
Thin Steel ◽  
Theoretical Results

A set of nonlinear equations that describe the nonlinear deformation of initially twisted bars under the influence of torsional moment and tension force, which act simultaneously, are derived. Special attention is devoted to the case of thin symmetrical cross sections and the equations appropriate to this case are shown. The linear terms of the equations, in the case of thin rectangular cross sections, are compared to solutions of the same problem, obtained by other researchers, who investigated the torsion and extension of helicoidal shells. It is shown that even for thin cross sections having large values of initial twist, the deviations between the two linear solutions are very small. To check the applicability of the theory to nonlinear regions, the theoretical results are compared to experimental results obtained during the course of the present research. The experiments include the torsion and extension of thin steel strips having rectangular cross sections. The agreement between both is very good, which proves the validity of the theory.

Theoretical and experimental investigation of the function of the wall flow deflecting ring. A single ring

1985 ◽  
Vol 50 (12) ◽  
pp. 2685-2696 ◽  
Author(s):  
Vladimír Staněk ◽  
Krumm Semkov ◽  
Nikolai Kolev ◽  
Georgii Paskalev
Keyword(s):  
Experimental Investigation ◽  
Theoretical Model ◽  
Reasonable Agreement ◽  
Experimental Results ◽  
Single Ring ◽  
The Future ◽  
Wall Flow ◽  
Trickle Bed ◽  
Theoretical Results

Theoretical model has been formulated of the flow of liquid in a randomly packed trickle bed column equipped with special wall flow deflecting rings (WFDR). Solutions have been obtained of the model for the case of a single ring. Theoretical results have been compared with experimental distributions of liquid in a 188.6 mm in diameter column packed with 25 mm Raschig rings and equipped with a single WFDR. Reasonable agreement of the theory with experimental results has been found and the theory is felt to be important in the future for optimizations of the number, size and spacing of the WFDR's to be used in industrial columns to check the extent of the flow on the wall.

scholarly journals Induced radioactivity problem for high-power heavy ion accelerators: Experimental investigation and long-time predictions

2002 ◽  
Vol 20 (3) ◽  
pp. 511-514 ◽  
Author(s):  
A. FERTMAN ◽  
I. BAKHMETJEV ◽  
V. BATYAEV ◽  
N. BORISENKO ◽  
A. CHERKASOV ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Dose Rate ◽  
Cross Sections ◽  
High Power ◽  
Production Cross ◽  
Heavy Ion ◽  
Ion Beams ◽  
Experimental Results ◽  
Long Time ◽  
Induced Radioactivity

The experimental results of the activation spectra, dose rate measurements, and the residual nuclide production cross sections obtained after the irradiation of the NatCu and 59Co targets by 12C ion beams at ITEP and GSI are presented in this paper. These results are compared with simulations by the CASCADE and LAQGSM codes.

scholarly journals Elastic scattering of electrons by barium atoms using the distorted wave method

2020 ◽  
Vol 1 (1) ◽  
pp. 33-38
Author(s):  
J. N. Kago ◽  
J. Okumu ◽  
C. S. Singh
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Experimental Results ◽  
Wave Method ◽  
Distorted Wave ◽  
Initial State ◽  
Partial Wave Expansion ◽  
Distorted Waves ◽  
Distorted Wave Method ◽  
Theoretical Results

Differential and integral cross sections of elastic scattering of electrons by barium atoms at intermediate energies (10 – 200 eV) were calculated using the distorted wave method. Being an elastic scattering both the initial and final distortion potentials were taken as the static potential of a barium atom in the initial state. The distorted waves are determined by the partial wave expansion method by expanding them in terms of spherical harmonics while the radial equation corresponding to distorted waves is evaluated using the Numerov method. A computer program DWBA1, for scattering was modified to perform numerical calculations for scattering and the results obtained are compared with the experimental and theoretical results available. The present integral cross sections are in good qualitative agreement with the experimental results and most of the theoretical results. For energies in the range 30 – 100 eV the present differential cross sections are in satisfactory agreement with the other theoretical and experimental results.

Compressed Thin-Walled Cold-Formed Steel Members with Closed Cross-Sections

2014 ◽  
Vol 969 ◽  
pp. 93-96 ◽  
Author(s):  
Mohamad Al Ali
Keyword(s):  
Experimental Investigation ◽  
Theoretical Analysis ◽  
Cross Sections ◽  
Theoretical Research ◽  
Loading Process ◽  
Steel Members ◽  
Fundamental Information ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Theoretical Results

The paper presents fundamental information about experimental-theoretical research oriented to determinate the resistance of thin-walled compressed steel members. The investigated members had closed cross-sections made from homogeneous materials. The theoretical analysis in this research is oriented to determinate the resistance of mentioned members according to relevant standards, while the experimental investigation is to verify the theoretical results and to investigate the behavior of mentioned members during the loading process.

Study of proton induced nuclear reactions on molybdenum: cross section measurements and theoretical calculations

2019 ◽  
Vol 108 (1) ◽  
pp. 1-9
Author(s):  
Alaa Elbinawi ◽  
Mogahed Al-abyad ◽  
Ibrahim Bashter ◽  
Usama Seddik ◽  
Ferenc Ditrói
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Theoretical Calculations ◽  
Experimental Results ◽  
Excitation Functions ◽  
Stacked Foil Technique ◽  
Theoretical Results ◽  
Production Conditions ◽  
Foil Technique

Abstract Excitation functions were measured by the activation method using the stacked-foil technique for the natMo(p,x)93(m+g),94m,g,95m,g,96(m+g),99mTc, 92m,95Nb reactions up to 18 MeV. The experimental results were compared with literature data and theoretical results from EMPIRE-3.2.2 code and TENDL. Special attention was paid to the 100Mo(p,2n)99mTc reaction which is very promising for the production of 99mTc at a cyclotron. In order to optimize the production conditions of some medically important Tc isotopes, the integral yields were estimated based on the measured cross sections.

Measurement of Li X-ray fluorescence production cross sections and intensity ratios of some elements at 59.54 keV

2015 ◽  
Vol 93 (10) ◽  
pp. 1057-1066 ◽  
Author(s):  
F. Akman ◽  
R. Durak ◽  
M.R. Kaçal ◽  
M.F. Turhan
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Reasonable Agreement ◽  
Production Cross ◽  
Radioactive Source ◽  
Experimental Results ◽  
X Ray ◽  
Intensity Ratios ◽  
Theoretical Results ◽  
Excitation Geometry

The Li (i = l, α, β, γ) X-ray production cross section and Lα/Ll, Lα/Lβ, Lα/Lγ, Ll/Lβ, Ll/Lγ, and Lβ/Lγ intensity ratio values for Yb, Ta, W, Hg, Tl, Pb, Bi, Th, and U have been determined using an excitation geometry at 59.54 keV incident photon energy. The measurements were performed using an Am-241 annular radioactive source and a high resolution Si(Li) detector. The experimental results of Li X-ray production cross sections and intensity ratios were compared with three different theoretical results and other available experimental results in the literature. Reasonable agreement is typically observed between the present and theoretical results.

The Influence of Loads Superposition, Deterioration Due to Cracks and Residual Stresses on the Strength of Tubular Junction

2017 ◽  
Vol 68 (6) ◽  
pp. 1267-1273
Author(s):  
Valeriu V. Jinescu ◽  
Angela Chelu ◽  
Gheorghe Zecheru ◽  
Alexandru Pupazescu ◽  
Teodor Sima ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Residual Stresses ◽  
Bending Moment ◽  
Combined Loading ◽  
Torsional Moment ◽  
Calculation Methods ◽  
State Of Stress ◽  
Cracked Structures ◽  
Total Participation ◽  
Theoretical Results

In the paper the interaction of several loads like pressure, axial force, bending moment and torsional moment are analyzed, taking into account the deterioration due to cracks and the influence of residual stresses. A nonlinear, power law, of structure material is considered. General relationships for total participation of specific energies introduced in the structure by the loads, as well as for the critical participation have been proposed. On these bases: - a new strength calculation methods was developed; � strength of tubular cracked structures and of cracked tubular junction subjected to combined loading and strength were analyzed. Relationships for critical state have been proposed, based on dimensionless variables. These theoretical results fit with experimental date reported in literature. On the other side stress concentration coefficients were defined. Our one experiments onto a model of a pipe with two opposite nozzles have been achieved. Near one of the nozzles is a crack on the run pipe. Trough the experiments the state of stress have been obtained near the tubular junction, near the tip of the crack and far from the stress concentration points. On this basis the stress concentration coefficients were calculated.

A Comparison of Theoretical and Experimental Results From Spherical Shells With a Single Radially Attached Nozzle

1967 ◽  
Vol 89 (3) ◽  
pp. 333-338 ◽  
Author(s):  
F. J. Witt ◽  
R. C. Gwaltney ◽  
R. L. Maxwell ◽  
R. W. Holland
Keyword(s):  
Spherical Shell ◽  
Internal Pressure ◽  
Experimental Results ◽  
Strain Gages ◽  
Spherical Shells ◽  
Axial Thrust ◽  
Outside Diameter ◽  
Theoretical Results

A series of steel models having single nozzles radially and nonradially attached to a spherical shell is presently being examined by means of strain gages. Parameters being studied are nozzle dimensions, length of internal nozzle protrusions, and angles of attachment. The loads are internal pressure and axial thrust and moment loadings on the nozzle. This paper presents both experimental and theoretical results from six of the configurations having radially attached nozzles for which the sphere dimensions are equal and the outside diameter of the attached nozzle is constant. In some instances the nozzle protrudes through the vessel.

scholarly journals Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cross Sections ◽  
Differential Cross ◽  
Legendre Polynomials ◽  
Neutral Kaon ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Theoretical Predictions ◽  
Photoproduction Reactions ◽  
Insight Into

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.

Experimental Study on the Failure Criterion for Brittle Materials in Compression

2011 ◽  
Vol 320 ◽  
pp. 259-262
Author(s):  
Xu Ran ◽  
Zhe Ming Zhu ◽  
Hao Tang
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Compressive Strength ◽  
Fracture Mechanics ◽  
Failure Criterion ◽  
Brittle Materials ◽  
Experimental Results ◽  
Experiment Study ◽  
Confining Stress ◽  
Theoretical Results

The mechanical behavior of multi-cracks under compression has become a very important project in the field of fracture mechanics and rock mechanics. In this paper, based on the previous theoretical results of the failure criterion for brittle materials under compression, experiment study is implemented. The specimens are square plates and are made of cement, sand and water, and the cracks are made by using a very thin film (0.1 mm). The relations of material compressive strength versus crack spacing and the lateral confining stress are obtained from experimental results. The experimental results agree well with the failure criterion for brittle materials under compression, which indicates that the criterion is effective and applicable.

Sign in / Sign up

Export Citation Format

Share Document