scholarly journals Experimental verification of a zero-dimensional model of the ionization kinetics of XeCl discharges

1994 ◽  
Vol 58 (2) ◽  
pp. 123-132 ◽  
Author(s):  
H. L�ck ◽  
D. Loffhagen ◽  
W. B�tticher
Keyword(s):  
Experimental Verification ◽  
Dimensional Model ◽  
Kinetics Of

Kinetics of oxidation of ammonia on cobalt catalyst I model of the reactor with catalytically active wall

1982 ◽  
Vol 47 (8) ◽  
pp. 2087-2096 ◽  
Author(s):  
Bohumil Bernauer ◽  
Antonín Šimeček ◽  
Jan Vosolsobě
Keyword(s):  
Parabolic Equations ◽  
Cobalt Catalyst ◽  
Nonlinear Parabolic Equations ◽  
Catalytic Reactions ◽  
Temperature Profiles ◽  
Dimensional Model ◽  
Kinetics Of Oxidation ◽  
Nonlinear Parabolic ◽  
Catalytically Active ◽  
Kinetics Of

A two dimensional model of a tabular reactor with the catalytically active wall has been proposed in which several exothermic catalytic reactions take place. The derived dimensionless equations enable evaluation of concentration and temperature profiles on the surface of the active component. The resulting nonlinear parabolic equations have been solved by the method of orthogonal collocations.

One-Dimensional Shape Memory Alloy Model Applicable to Any Status of Stress and Temperature

2006 ◽  
Vol 326-328 ◽  
pp. 1475-1478
Author(s):  
Jong Ha Chung ◽  
Jin Seok Heo ◽  
Myoung Sik Won ◽  
Woo Yong Lee ◽  
Jung Ju Lee
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Principal Factor ◽  
Material Behavior ◽  
Transformation Kinetics ◽  
Dimensional Model ◽  
Suggested Model ◽  
One Dimensional ◽  
Dimensional Shape ◽  
Kinetics Of

The transformation kinetics formulation is the principal factor underlying the constitutive model of shape memory alloys. Therefore, the transformation kinetics formulation, which is applicable to any status of stress and temperature, is essential for predicting the material behavior of SMAs. In this work, we show that the transformation kinetics of the Brinson model, which is the most widely used 1-dimensional model, has shortcomings under certain stress and temperature histories. In addition, we propose a modified transformation kinetics model that can be used for any stress or temperature conditions. The martensite transformation kinetics is modified so that the transformation from austenite into temperature-induced martensite, due to the decrement of temperature, is coupled with a transformation from austenite or temperature-induced martensite into stress-induced martensite, due to the increment of the stress. Through this modification, the suggested model can simulate the behavior of shape memory alloy materials under arbitrarily changed circumstances at every stress-temperature region.

Kinetics of structural relaxations in a two-dimensional model atomic glass III

1989 ◽  
Vol 329 (1608) ◽  
pp. 595-612 ◽  
Keyword(s):  
Molecular Dynamics ◽  
Free Energy ◽  
Excess Enthalpy ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Distortion Parameter ◽  
Topological Features ◽  
Two Dimensional Model ◽  
Molecular Dynamics Methods ◽  
Kinetics Of

The kinetics of structural relaxation in a two-dimensional model atomic glass quenched infinitely rapidly from the melt to 0.55 of the glass transition tem perature was simulated by the molecular dynamics methods to study the chronological ordering of the atomic kinematics associated with such relaxations. Over the very short periods of ageing ( ca .200 atomic fluctuations) accessible to the molecular dynamics (MD) method, a Williams-Watts form of relaxation with a fractional exponent of 0.5 was found to hold for excess enthalpy, free volume and site distortion parameter. The distribution of free energy barriers associated with the relaxation that resulted from the analysis could be scaled up to describe processes occurring on macroscopic timescales, and agrees well with experimental results in Cu x Zr 1-x glasses. Results on the clustering of relaxations and other topological features of the relaxation process are also reported.

On the Material Process Simulation Code COSMAP- Simulated Examples and its Experimental Verification for Heat Treatment Process

2007 ◽  
Vol 345-346 ◽  
pp. 955-958 ◽  
Author(s):  
Dong Ying Ju ◽  
Tatsuo Inoue
Keyword(s):  
Heat Treatment ◽  
Experimental Verification ◽  
Treatment Process ◽  
Mechanical Processing ◽  
Simulation Code ◽  
Coupled Equations ◽  
Quenching Process ◽  
Material Process ◽  
And Function ◽  
Kinetics Of

Strategy and function of a new developed FEM code COSMAP(COmputer Simulation of MAterial Process) for surface hardening during of thermo-mechanical processing, including heat treatment, carbonizing and nitriding, is briefly introduced in this paper. The simulation code is developed based on the metallo-thermo-mechanical theory considering the coupled equations of diffusion, heat conduction, inelastic stresses and kinetics of phase transformation. Some examples of simulation and the experimental verification for carbonized quenching, carbonizednitrided- quenching process of a cylinder and ring as well as a gear are illustrated, and comparison of the simulated values of distortion, residual stresses and profile of induced phases with the experimental data is made with some discussions.

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