scholarly journals Stochastic Computer Simulation of Cermet Coatings Formation

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Oleg P. Solonenko ◽  
Vladimir I. Jordan ◽  
Vitaly A. Blednov
Keyword(s):  
Computer Simulation ◽  
Liquid Metal ◽  
Substrate Temperature ◽  
Numerical Experiments ◽  
Lamellar Structure ◽  
Computational Algorithm ◽  
Thermal Spraying ◽  
Physical Parameters ◽  
Program Complex ◽  
Computational Technology

An approach to the modeling of the process of the formation of thermal coatings lamellar structure, including plasma coatings, at the spraying of cermet powders is proposed. The approach based on the theoretical fundamentals developed which could be used for rapid and sufficiently accurate prediction of thickness and diameter of cermet splats as well as temperature at interface “flattening quasi-liquid cermet particle-substrate” depending on the key physical parameters (KPPs): temperature, velocity and size of particle, substrate temperature, and concentration of finely dispersed solid inclusions uniformly distributed in liquid metal binder. The results are presented, which concern the development of the computational algorithm and the program complex for modeling the process of laying the splats in the coating with regard to the topology of its surface, which varies dynamically at the spraying, as well as the formation of lamellar structure and porosity of the coating. The results of numerical experiments are presented through the example of thermal spraying the cermet TiC-30 vol.% NiCr powder, illustrating the performance of the developed computational technology.

Efficient Dynamic Computer Simulation of Simple-Closed Spatial Linkages

1990 ◽  
Author(s):  
L. T. Wang
Keyword(s):  
Computer Simulation ◽  
Computational Algorithm ◽  
Equations Of Motion ◽  
Joint Space ◽  
Kinematic Chains ◽  
Spatial Linkages ◽  
Dynamic Computer Simulation ◽  
The Stability ◽  
Coordinate Partitioning ◽  
Generalized Coordinate

Abstract A new method of formulating the generalized equations of motion for simple-closed (single loop) spatial linkages is presented in this paper. This method is based on the generalized principle of D’Alembert and the use of the transformation Jacobian matrices. The number of the differential equations of motion is minimized by performing the method of generalized coordinate partitioning in the joint space. Based on this formulation, a computational algorithm for computer simulation the dynamic motions of the linkage is developed, this algorithm is not only numerically stable but also fully exploits the efficient recursive computational schemes developed earlier for open kinematic chains. Two numerical examples are presented to demonstrate the stability and efficiency of the algorithm.

Numerical simulation of seismic waves in porous media components

2021 ◽  
Vol 9 (1) ◽  
pp. 4-30
Author(s):  
M. Azeredo ◽  
◽  
V. Priimenko ◽  
Keyword(s):  
Numerical Simulation ◽  
Porous Medium ◽  
High Frequency ◽  
Seismic Waves ◽  
Computational Algorithm ◽  
Low Frequency ◽  
Physical Parameters ◽  
Mathematical Algorithm ◽  
Biot Equations ◽  
Attenuation And Dispersion

This work presents a mathematical algorithm for modeling the propagation of poroelastic waves. We have shown how the classical Biot equations can be put into Ursin’s form in a plane-layered 3D porous medium. Using this form, we have derived explicit for- mulas that can be used as the basis of an efficient computational algorithm. To validate the algorithm, numerical simulations were performed using both the poroelastic and equivalent elastic models. The results obtained confirmed the proposed algorithm’s reliability, identify- ing the main wave events in both low-frequency and high-frequency regimes in the reservoir and laboratory scales, respectively. We have also illustrated the influence of some physical parameters on the attenuation and dispersion of the slow wave.

scholarly journals Mathematical Modeling of Pollution Transfer in Open Channel

2019 ◽  
pp. 49-50
Author(s):  
Petro Martyniuk ◽  
Oksana Ostapchuk ◽  
Vitalii Nalyvaiko
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Numerical Solution ◽  
Boundary Problem ◽  
Water Flow ◽  
Numerical Experiments ◽  
Open Channel ◽  
Computational Algorithm ◽  
The Mathematical Model

The problem of pollution transfer by water flow in open channel was considered. The mathematical model of the problem was constructed. The numerical solution of the onedimensional boundary problem was obtained. The computational algorithm for solving the problem was programmed to implement. A series of numerical experiments with their further analysis was conducted.

Simulation of the water balance for plants growing on coarse textured soils

Soil Research ◽  
1975 ◽  
Vol 13 (1) ◽  
pp. 21 ◽  
Author(s):  
BA Carbon ◽  
KA Galbraith
Keyword(s):  
Computer Simulation ◽  
Water Balance ◽  
Simulation Model ◽  
Close Agreement ◽  
Water Storage ◽  
Field Measurements ◽  
Soil Water Storage ◽  
Physical Parameters ◽  
Computer Simulation Model ◽  
Deep Drainage

A computer simulation model* of the water balance for plants growing on coarse soils was developed and tested against field measurements. The inputs for this model are measurable physical parameters. From the close agreement between simulated and observed results, it is suggested that evaporation, soil water storage and deep drainage may be satisfactorily predicted.

Nozzle extraction geometry of a liquid metal atomizer optimized by computer simulation of electric fields

1996 ◽  
Vol 32 (4) ◽  
pp. 844-850 ◽  
Author(s):  
S.R. Cvetkovic ◽  
W. Balachandran ◽  
B. Kleveland ◽  
P.G. Arnold ◽  
F.G. Wilson ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Liquid Metal ◽  
Electric Fields

Computer Simulation of the Early Stages of Nano Scale SiC Growth on Si

2005 ◽  
Vol 483-485 ◽  
pp. 169-172
Author(s):  
K.L. Safonov ◽  
Yuri V. Trushin ◽  
Oliver Ambacher ◽  
Jörg Pezoldt
Keyword(s):  
Computer Simulation ◽  
Silicon Carbide ◽  
Molecular Beam Epitaxy ◽  
Substrate Temperature ◽  
Size Distribution ◽  
Rate Equation ◽  
Molecular Beam ◽  
Carbon Fluxes ◽  
Island Size ◽  
Nano Scale

Solid source molecular beam epitaxy was applied to create silicon carbide nanoclusters on silicon. The island size distribution can be controlled by an appropriate substrate temperature, carbon fluxes and process times. Rate equation computer simulation was applied to simulate the experimental obtained nano scale nuclei properties.

TiO-based coatings prepared by plasma spraying in air of Ti + C mixtures

2006 ◽  
Vol 21 (7) ◽  
pp. 1770-1774 ◽  
Author(s):  
B. Haller ◽  
A. Grimaud ◽  
J-C. Labbe ◽  
J-P. Bonnet
Keyword(s):  
Phase Composition ◽  
Cast Iron ◽  
Liquid Metal ◽  
Plasma Spraying ◽  
Thermal Spraying ◽  
Titanium Monoxide ◽  
Optimal Conditions ◽  
Stoichiometric Mixture ◽  
Excess Carbon ◽  
Gas Tight

This work presents an original way for preparing TiO-based coatings by thermal spraying. As titanium monoxide is oxidized by the mere trace of oxygen contained in hydrogen, it is obvious that plasma spraying of TiO powder does not lead easily to the formation of a titanium monoxide coating. However, thermodynamical calculations show that the conditions necessary for the preparation of TiO can be reached, at the titanium melting temperature (Tm=1933 K), when oxygen reacts with liquid metal in the presence of excess carbon. These results have led to experiments in which TiO-based coatings have been prepared by spraying a stoichiometric mixture of graphite and titanium grains onto cast iron in air. In optimal conditions, a gas-tight hard coating (1000 ± 15 HV3) of a TiO-based phase (composition: TiO0.81±0.06C0.04±0.02) has been obtained.

scholarly journals Numerical Experiments on Expanding Gravitational Systems

1974 ◽  
Vol 62 ◽  
pp. 257-257
Author(s):  
G. Janin ◽  
M. J. Haggerty
Keyword(s):  
Computer Simulation ◽  
Numerical Experiments ◽  
Density Fluctuations ◽  
Gravitational Systems ◽  
Interacting Systems

It has been suggested that particle positions in expanding N-body gravitational systems may become increasingly correlated. Such incoherent density fluctuations could develop into bound clusters. Similarly superclusters of such clusters may be dynamically created. We present results of explorations of this idea, using computer simulation. Accurate integrations are made of gravitationally interacting systems of a few hundred particles.

scholarly journals Microstructural Characteristics in Babbitt Coatings Deposited by LPCS

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 689
Author(s):  
Wolfgang Tillmann ◽  
Leif Hagen ◽  
Mohamed Abdulgader ◽  
Mark Dennis Kensy ◽  
Michael Paulus
Keyword(s):  
Solid Solution ◽  
Substrate Temperature ◽  
Thermal Spraying ◽  
Cold Spraying ◽  
Maximum Load ◽  
Gas Temperature ◽  
Microstructural Characteristics ◽  
Mesoscopic Structure ◽  
Solid Solution Matrix ◽  
Solution Matrix

Studies have already established that the mechanical properties of Babbitt coatings significantly depend on the microstructural characteristics, such as the amount and distribution of intermetallic compounds dispersed in a soft solid solution matrix. For Sn–Sb–Cu-based Babbitt coatings, the formation of SbSn- and CuSn-based precipitates has a substantial influence on the resulting microhardness and thus determines the maximum load carrying capacity. Thermal spraying of Sn-based Babbitt coatings results in a relatively more refined structure of these precipitates than in common manufacturing processes, such as casting, due to the thermal processing conditions. This study aims to evaluate the effect of the temperature of the propellant gas and substrate temperature on the microstructural characteristics of Sn–Sb–Cu-based Babbitt coatings deposited by low pressure cold spraying (LPCS). The deposits were examined for their phase composition, microhardness and mesoscopic structure. It was found that the coatings were mainly composed of Sb2Sn23, Sb0.49Sn0.51 and Sorosite (CuSn or CuSb0.115Sn0.835), regardless of the substrate temperature or temperature of the propellant gas to be investigated. For a gas temperature above 300 °C, an increased microhardness was observed, which correlates with the appearance of a more homogenous distribution of Sb0.49Sn0.51 dispersed in a soft Sn-rich solid solution matrix.

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