Application of Visco-Plastic Self Consistent Approach to Model Deformation Characteristics of Magnesium with Different Textures

2011 ◽  
Vol 702-703 ◽  
pp. 80-84
Author(s):  
Apu Sarkar ◽  
J.K. Chakravartty
Keyword(s):  
Experimental Data ◽  
Experimental Evidence ◽  
Uniaxial Tensile ◽  
Deformation Characteristics ◽  
Self Consistent ◽  
Plastic Forming ◽  
Constitutive Response ◽  
Low Symmetry ◽  
Consistent Approach ◽  
Good Agreement

The viscoplastic self-consistent (VPSC) formulation is by now a well established approach for simulating texture development and constitutive response during plastic forming of high and low-symmetry polycrystals. In this work we have used the VPSC approach to model the uniaxial tensile and compressive deformation characteristics of pure magnesium with random and extruded texture. We compare our results with experimental data and find that they are in good agreement with the available experimental evidence.

Analysis of Experimental Data From Ship Trajectories of Turning Circles in a Regular Seaway

2010 ◽  
Author(s):  
Joseph T. Klamo ◽  
Ray-Qing Lin
Keyword(s):  
Experimental Data ◽  
Quantitative Analysis ◽  
Time Varying ◽  
Ship Maneuvering ◽  
New Findings ◽  
Self Consistent ◽  
Calm Water ◽  
Experimental Laboratory ◽  
Ship Tracks ◽  
Good Agreement

The accurate prediction of the track of a ship maneuvering in a seaway is one of the most important tasks in seakeeping. Most ship maneuvering studies, both experimental and numerical, focus on maneuvering in calm water. Recently, Lin and Klamo (2010) used the Digital Self-consistent Ship Experimental Laboratory (DiSSEL) to study the ship track of a turning circle maneuver in a wave field. In that study, it was shown that their simulated ship trajectories had good agreement with experimentally measured tracks. This agreement motivated the following quantitative analysis of the experimental data to characterize the effects that wave impacts have on turning circle ship tracks. Our method involves describing the ship trajectories as sinusoids with time-varying means. We also estimate the uncertainty in the results from our analysis of the experimental measurements. The quantitative analysis shows overall agreement with Lin and Klamo (2010). New findings are also discussed such as changes in the distance and time to complete the maneuver as well as the speed and preferred directions of a drifting turning circle.

The energy of a unitary Fermi gas in the normal phase including the effect of induced interaction

2015 ◽  
Vol 29 (32) ◽  
pp. 1550207 ◽  
Author(s):  
Hao Gong ◽  
Xiao-Xia Ruan ◽  
Hou-Rong Pang ◽  
Hong-Shi Zong
Keyword(s):  
Experimental Data ◽  
Chemical Potential ◽  
Normal Phase ◽  
Fermi Gases ◽  
Matrix Approximation ◽  
Ultracold Fermi Gases ◽  
Self Consistent ◽  
Unitary Fermi Gas ◽  
T Matrix ◽  
Good Agreement

In this paper, taking into account the effect of the induced interaction, we calculate the energy of ultracold Fermi gases at unitarity in the framework of non-self-consistent T-matrix approximation (nTMA) above the critical temperature and compare the result with the experimental data and other theoretical calculation without induced interaction. Our calculated chemical potential is higher than the experimental data, but our calculated energy obtains a good agreement with Tokyo experiment for temperature range between [Formula: see text] and [Formula: see text].

scholarly journals Hadron production in pp and AA collisions at mid-rapidity within self-similarity approach

2019 ◽  
Vol 204 ◽  
pp. 01022 ◽  
Author(s):  
Gennady Lykasov ◽  
Alexander Malakhov
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Hadron Production ◽  
The Self ◽  
Self Similarity ◽  
Satisfactory Description ◽  
Self Consistent ◽  
Consistent Approach ◽  
Aa Collisions

The self-consistent approach based on similarity of inclusive spectra of hadrons produced in pp and AA collisions is reviewed. We present its modification due to the quark-gluon dynamics to describe the inclusive spectra of hadrons produced in pp collision as a function of the transverse momentum pt at mid-rapidity. The extension of this approach to analyze the pion pt-spectra produced in AA collision at high and middle energies and mid-rapidity is given. A satisfactory description of experimental data on these spectra in pp and AA collisions within the offered approach is shown.

COLLECTIVE QUADRUPOLE EXCITATIONS WITHIN A SELF-CONSISTENT APPROACH

2006 ◽  
Vol 15 (02) ◽  
pp. 379-386 ◽  
Author(s):  
L. PRÓCHNIAK
Keyword(s):  
Experimental Data ◽  
Degrees Of Freedom ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Low Energy ◽  
Time Dependent ◽  
Collective Excitations ◽  
Skyrme Interaction ◽  
Self Consistent ◽  
Consistent Approach

Low energy quadrupole collective excitations are investigated using a model based on the Adiabatic Time Dependent HFB theory. Distinctive feature of proposed method is an extension of the collective space by adding variables referring to pairing degrees of freedom. In the microscopic part of the model effective Skyrme interaction and constant G pairing force are employed. Calculated energy levels and B(E2) transition probabilities in the 128 Xe nucleus are compared with the experimental data.

A Self-Consistent Scheme for the Relaxation Behavior of Metals

1981 ◽  
Vol 48 (4) ◽  
pp. 779-784 ◽  
Author(s):  
G. J. Weng
Keyword(s):  
Experimental Data ◽  
Relaxation Behavior ◽  
The Self ◽  
Combined Stress ◽  
Temperature Dependent ◽  
Free Process ◽  
Self Consistent ◽  
Temperature Environment ◽  
Stress Variations ◽  
Good Agreement

We identify in this paper that stress relaxation in metals is a “strain-free” process. The corresponding self-consistent relations between the strain, and stress variations of a grain and of its aggregate are derived from Eshelby’s solution of an ellipsoidal inclusion. It is shown that, under such a process, the strain in a more favorably oriented grain continues to rise and that its stress decreases more drastically than that of the aggregate; conversely, for a less favorably oriented grain, its strain decreases and its stress relaxes less. The self-consistent relations are supplemented with a temperature-dependent, physically consistent constitutive equation for the slip system. Such an equation enables us to determine the single crystal constants at one temperature from the polycrystal data at another temperature; it also makes the self-consistent scheme applicable to the varying-temperature environment. The established theory was finally applied to predict the relaxation behavior of an RR-59 aluminum alloy under combined stress; the results showed reasonably good agreement with the experimental data.

LCAO MO CALCULATIONS ON A SERIES OF NITRILES AND SOME RELATED MOLECULES BY A METHOD OF SELF-CONSISTENT FORMAL CHARGES

1964 ◽  
Vol 42 (6) ◽  
pp. 1323-1332 ◽  
Author(s):  
J. B. Moffat
Keyword(s):  
Experimental Data ◽  
Input Data ◽  
Electron Systems ◽  
Bond Orders ◽  
Mo Calculations ◽  
Bond Lengths ◽  
Triple Bonds ◽  
Self Consistent ◽  
Good Agreement ◽  
Lcao Mo

A method of self-consistent charges has been applied to an LCAO MO calculation of a series of nitriles and some related molecules. The π-electron bond orders and π-electron densities were calculated for all the molecules considered. The entire calculation was programmed for operation on the IBM 1620 with alterations of the input data for the different molecules. The calculated bond orders yield bond lengths for C—C and C=C bonds in good agreement with experimental data, except when two or more triple bonds are present in the molecule. By the assumption of additivity of the bond orders obtained for the two orthogonal pi-electron systems, bond orders are obtained which yield bond lengths in satisfactory agreement with the experimental results for all CC bonds. For the nitrile bonds the calculated bond orders were fitted to a linear equation with the experimental bond lengths.

The pressure and entropy of a unitary Fermi gas with particle-hole fluctuation

2018 ◽  
Vol 32 (01) ◽  
pp. 1750364
Author(s):  
Hao Gong ◽  
Xiao-Xia Ruan ◽  
Hong-Shi Zong
Keyword(s):  
Experimental Data ◽  
Fermi Gas ◽  
Experimental Measurements ◽  
Matrix Approximation ◽  
Self Consistent ◽  
Unitary Fermi Gas ◽  
T Matrix ◽  
Theoretical Results ◽  
Previous Prediction ◽  
Good Agreement

We calculate the pressure and entropy of a unitary Fermi gas based on universal relations combined with our previous prediction of energy which was calculated within the framework of the non-self-consistent T-matrix approximation with particle-hole fluctuation. The resulting entropy and pressure are compared with the experimental data and the theoretical results without induced interaction. For entropy, we find good agreement between our results with particle-hole fluctuation and the experimental measurements reported by ENS group and MIT experiment. For pressure, our results suffer from a systematic upshift compared to MIT data.

Some practical features for calculating the polycrystalline elastic properties from texture

1991 ◽  
Vol 24 (6) ◽  
pp. 978-981 ◽  
Author(s):  
M. Humbert ◽  
J. Diz
Keyword(s):  
Elastic Properties ◽  
Polycrystalline Material ◽  
Mean Values ◽  
Texture Information ◽  
Pole Figures ◽  
Self Consistent ◽  
Orientation Density ◽  
Low Symmetry ◽  
Consistent Approach ◽  
Hexagonal Materials

The prediction of the elastic properties of a polycrystalline material requires the knowledge of its orientation density function (ODF), which represents mathematically the crystallographic texture. The real piece of texture information needed for such calculations depends on the modelling and is obtained from pole figures, the number of which is determined by crystal symmetry. According to these features different methods have been used to calculate (mean values, self-consistent approach) the elastic properties of low-symmetry materials with minimal texture information. Calculation of these properties for hexagonal materials becomes very simple and can be achieved directly from 00.1 pole figures.

scholarly journals Thermodynamic re-assessment of the Al-Sn-Zn ternary system

2019 ◽  
Vol 55 (3) ◽  
pp. 439-449 ◽  
Author(s):  
T. Cheng ◽  
L.-J. Zhang
Keyword(s):  
Experimental Data ◽  
Ternary System ◽  
Phase Equilibria ◽  
Experimental Phase Equilibria ◽  
Calphad Approach ◽  
Experimental Phase ◽  
Ternary Interaction ◽  
Self Consistent ◽  
Comprehensive Comparison ◽  
Good Agreement

In this paper, a thermodynamic re-assessment of the Al-Sn-Zn ternary system was performed by means of the CALculation of PHAse Diagram (CALPHAD) approach. The thermodynamic descriptions of the binary Al-Sn, Al-Zn, and Sn-Zn systems from the literature were directly adopted, and the newly reported experimental phase equilibria, enthalpies of mixing, and activities of Al in the ternary liquid phase were taken into account. A set of self-consistent thermodynamic parameters for the ternary Al-Sn-Zn system were finally obtained. A comprehensive comparison between the presently calculated phase equilibria/thermodynamic properties and the experimental data indicates that the present thermodynamic descriptions of the ternary Al-Sn-Zn system show very good agreement with most of the experimental data. The further direct comparison with the calculated results due to the previous assessment demonstrates that a significant improvement was achieved by the present assessment though fewer ternary interaction parameters were utilized.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

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