Influence of the Profile Radius of the Deforming Roller on the Limit Degree of Deformation in the Process of Flow Forming

2019 ◽  
Vol 946 ◽  
pp. 800-806
Author(s):  
Andrey A. Udalov ◽  
Aleksander V. Udalov ◽  
Sergey V. Parshin
Keyword(s):  
Experimental Data ◽  
Theoretical Investigation ◽  
Theoretical Study ◽  
Initial Thickness ◽  
Flow Forming ◽  
Degree Of Deformation ◽  
Engineering Technique ◽  
Good Agreement

A theoretical investigation of the influence of the profile radius of the deforming roller on the limiting degrees of deformation in the process of flow forming is performed. Analytical and graphical dependencies allowing to determine the limiting degrees of deformation are obtained depending on the ratio of the profile radius of the roller to the initial thickness of the workpiece wall. The main practical ways of using the obtained dependences are considered. The results of the theoretical study are in good agreement with the known experimental data. The developed engineering technique can be used in designing the process of flow forming of cylindrical blanks by a torus roller.

scholarly journals Theoretical investigation of the effect of the taper angle of the deforming roller on the limiting degrees of deformation in the process of flow forming

2018 ◽  
Vol 224 ◽  
pp. 01040
Author(s):  
Andrey A. Udalov ◽  
Sergey V. Parshin ◽  
Aleksandr V. Udalov
Keyword(s):  
Experimental Data ◽  
Theoretical Study ◽  
Cone Angle ◽  
Pressure Treatment ◽  
Boundary Values ◽  
Flow Forming ◽  
Taper Angle ◽  
Engineering Technique ◽  
Reverse Method ◽  
Good Agreement

The conditions for the application of taper angles of deforming rollers are considered in the article, which ensure a steady flow of the flow forming. With the help of the developed engineering technique, analytical and graphical dependences of the boundary values of the deformation degrees on the cone angle of the deforming roller are obtained. The results of the theoretical study are in good agreement with the known experimental data. The developed engineering technique can be used in designing the flow forming on the direct and reverse method, as well as for any process of pressure treatment with a local focus of deformation.

Explanation of the Influence of Inflow Air Content on the Lift of Cavitating Hydrofoils

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Eduard Amromin
Keyword(s):  
Experimental Data ◽  
Theoretical Study ◽  
Lift Coefficient ◽  
Cavity Surface ◽  
Air Bubbles ◽  
Incoming Flow ◽  
Fluid Density ◽  
Air Content ◽  
Theoretical Results ◽  
Good Agreement

According to several known experiments, an increase of the incoming flow air content can increase the hydrofoil lift coefficient. The presented theoretical study shows that such increase is associated with the decrease of the fluid density at the cavity surface. This decrease is caused by entrainment of air bubbles to the cavity from the surrounding flow. The theoretical results based on such explanation are in a good agreement with the earlier published experimental data for NACA0015.

A theoretical study of energy spectra and transition probabilities of 200–204Hg isotopes in transitional region of IBM

2014 ◽  
Vol 23 (10) ◽  
pp. 1450056 ◽  
Author(s):  
H. Sabri
Keyword(s):  
Experimental Data ◽  
Theoretical Study ◽  
Transition Probabilities ◽  
Energy Spectra ◽  
Interacting Boson Model ◽  
Transitional Region ◽  
Transition Rates ◽  
Scale Factors ◽  
Boson Model ◽  
Good Agreement

In this paper, by using the SO(6) representation of eigenstates and transitional Interacting Boson Model (IBM) Hamiltonian, the evolution from prolate to oblate shapes along the chain of Hg isotopes is studied. Parameter-free (up to overall scale factors) predictions for spectra and B(E2) transition rates are found to be in good agreement with experimental data for 200–204 Hg isotopes which are supported to be located in this transitional region.

scholarly journals Low-Temperature Properties of Compensated Ge Films Used for Cryogenic Thermometers

2002 ◽  
Vol 719 ◽  
Author(s):  
V. F. Mitin ◽  
V. V. Kholevchuk ◽  
V. K. Dugaev ◽  
M. Vieira
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Low Temperature ◽  
Theoretical Study ◽  
Temperature Sensors ◽  
Temperature Resistance ◽  
Gaas Substrates ◽  
Heavily Doped ◽  
Low Temperature Resistance ◽  
Good Agreement

AbstractLow temperature microsensors are designed for cryogenic applications. As a material for the sensors we use heavily doped compensated Ge films deposited on the semi-insulating GaAs substrates. We present the results of experimental and theoretical study of the low temperature resistance as a function of temperature and magnetic field for some models of temperature sensors. The computer simulations show a good agreement with experimental data.

Energetic and Exergetic Analysis of the Clay Bricks Drying in an Industrial Tunnel Dryer

2016 ◽  
Vol 369 ◽  
pp. 104-109 ◽  
Author(s):  
G.S. Almeida ◽  
F.V.S. Tavares ◽  
W.M.P.B. Lima ◽  
A.G. Barbosa de Lima
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Moisture Content ◽  
Theoretical Study ◽  
Clay Bricks ◽  
Tunnel Dryer ◽  
Energy And Exergy ◽  
Exergetic Analysis ◽  
Good Agreement ◽  
Hollow Bricks

The purpose of this paper is to present a theoretical study of industrial hollow bricks drying in across flow tunnel dryer. The theoretical model is based on the 1st and 2nd laws of Thermodynamic applied to the system. To validate the methodology, numerical and experimental data of the moisture content of the brick during the drying in an industrial scale are compared and a good agreement was obtained. Results of moisture content and temperature of the product and air, and energy and exergy efficiencies are presented and analysed.

scholarly journals First Principles Study of Cerium Monochalcogenides

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Recep Eryiğit
Keyword(s):  
Experimental Data ◽  
Plane Wave ◽  
Theoretical Investigation ◽  
First Principles ◽  
Magnetic Moments ◽  
Generalized Gradient ◽  
Generalized Gradient Approximation ◽  
First Principles Study ◽  
Dynamical Properties ◽  
Good Agreement

A theoretical investigation of structural, magnetic, electronic, and lattice dynamical properties of cerium monochalcogenides using the generalized gradient approximation (GGA) +Uwithin ultrasoft pseudopotentials and a plane-wave basis is presented. All the calculated quantities, except the local magnetic moments, are found to be in good agreement with the experimental data. The lattice dynamical results indicate a strong chalcogenide dependence for the anomalous features of the phonon dispersions.

scholarly journals Applicability of Different Isothermal EOS at Nanomaterials

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Deepika P. Joshi ◽  
Anjali Senger
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Pressure Range ◽  
Theoretical Study ◽  
Isothermal Bulk Modulus ◽  
Relative Compression ◽  
Experimental Values ◽  
Murnaghan Equation ◽  
Two Parameter ◽  
Good Agreement

The present study explains the behaviour of nanomaterials such as AlN, CdSe, Ge, WC, and Ni- and Fe-filled-MWCNTs under high pressure. Among the number of isothermal EOSs available, we prefer only two parameter-based isothermal equations (i.e., Murnaghan equation, usual Tait's equation, Suzuki equation and Shanker equation). The present work shows the theoretical study of thermo-elastic properties especially relative compression (V/V0), isothermal bulk modulus (KP/K0), and compressibility (αP/α0) of nanomaterials. After comparing all formulations with available experimental data, we conclude that pressure dependence of relative compression (V/V0) for the nanomaterials, are in good agreement for all the equations at lower pressure range. At higher pressure range, Suzuki and Shanker formulations show some deviation from experimental values.

scholarly journals Investigation, analysis and comparison of current-voltage characteristics for Au/Ni/GaN Schottky structure using I-V-T simulation

2019 ◽  
Vol 37 (3) ◽  
pp. 496-502 ◽  
Author(s):  
A. Sadoun ◽  
S. Mansouri ◽  
M. Chellali ◽  
N. Lakhdar ◽  
A. Hima ◽  
...  
Keyword(s):  
Experimental Data ◽  
Barrier Height ◽  
Theoretical Study ◽  
Series Resistance ◽  
Electrical Parameters ◽  
Current Voltage ◽  
Temperature Ranges ◽  
Current Voltage Characteristics ◽  
Schottky Structure ◽  
Good Agreement

AbstractIn this work, we have presented a theoretical study of Au/Ni/GaN Schottky diode based on current-voltage (I-V) measurement for temperature range of 120 K to 400 K. The electrical parameters of Au/Ni/GaN, such as barrier height (Φb), ideality factor and series resistance have been calculated employing the conventional current-voltage (I-V), Cheung and Chattopadhyay method. Also, the variation of Gaussian distribution (P (Φb)) as a function of barrier height (Φb) has been studied. Therefore, the modified ( {( {\ln \left( {{{{\rm{I}}_0 } \over {{\rm{T}}^2 }}} \right) - \left( {{{{\rm{q}}^2 \sigma _{{\rm{s}}0}^2 } \over {2{\rm{kT}}^2 }}} \right) = \ln ( {{\rm{AA}}^*} ) - {{{\rm{q}}\emptyset_{{\rm B}0} } \over {{\rm{kT}}}}} ){\rm{vs}}.( {{1 \over {{\rm{kT}}}}} )} ) relation has been extracted from (I-V) characteristics, where the values of ΦB0 and {\rm{A}}_{{\rm{Simul}}}^* have been found in different temperature ranges. The obtained results have been compared to the existing experimental data and a good agreement was found.

scholarly journals ELECTROROTATION OF COLLOIDAL SUSPENSIONS

2003 ◽  
Vol 17 (01n02) ◽  
pp. 221-225 ◽  
Author(s):  
J. P. HUANG ◽  
K. W. YU ◽  
G. Q. GU
Keyword(s):  
Experimental Data ◽  
Cell Shape ◽  
Theoretical Study ◽  
Colloidal Suspensions ◽  
Shape Effect ◽  
Oblate Spheroidal ◽  
Theoretical Predictions ◽  
Analytic Expressions ◽  
Particle Shape Effect ◽  
Good Agreement

We investigate the pressure effect on the eletrorotation (ER) spectrum of living cell suspensions by considering the particle shape effect. Based upon the spectral representation theory, we consider coated oblate spheroidal particles and present a theoretical study of ER spectrum. Analytic expressions for the characteristic frequency as well as the dispersion strength can be obtained, thus simplifying the fitting of experimental data. From the theoretical analysis, we find that the cell shape, coating as well as material parameters can change the ER spectrum. We demonstrate good agreement between our theoretical predictions and experimental data on human erythrocytes suspensions.

Rate coefficients for the reaction of OH radicals with cis-3-hexene: an experimental and theoretical study

2015 ◽  
Vol 17 (14) ◽  
pp. 8714-8722 ◽  
Author(s):  
Thaís da Silva Barbosa ◽  
Silvina Peirone ◽  
Javier A. Barrera ◽  
Juan P. A. Abrate ◽  
Silvia I. Lane ◽  
...  
Keyword(s):  
Experimental Data ◽  
Theoretical Study ◽  
Rate Coefficients ◽  
Oh Radicals ◽  
Experimental Rate ◽  
Theoretical Results ◽  
Good Agreement

Microcanonical variational rate coefficients and experimental rate coefficients for the OH addition to cis-3-hexene have been determined. Theoretical results showed a non-Arrhenius profile and good agreement with the experimental data.

Sign in / Sign up

Export Citation Format

Share Document