2007

Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/2922

Переглянути

Зараз показуємо 1 - 5 з 5

Constitutive and numerical modeling of chemical and mechanical phenomena in solid oxide fuel cells and oxygen permeable membranes
(НТУ "ХПІ", 2007) Zolochevsky, A.; Kühhorn, A.
A relation between diffusion of the oxygen ions, chemical expansion in electrochemical ceramics, and chemically induced stress evolution in the cathode over time for the Single Chamber Solid Oxide Fuel Cell based on the miniaturisation concept using thick films produced by screen-printing method has been established. The proposed model has been used to calculate the time dependent stress distribution in the cathode as a function of the material parameters, geometrical parameters of the cathode, and concentration of the oxygen ions under steady state operating conditions of the Single Chamber Solid Oxide Fuel Cell.
An integrated approach to assessing seismic simulation based on analysis of preseismic, coseismic, postseismic and interseismic creep, and creep damage evolution
(НТУ "ХПИ", 2007) Zolochevsky, A.; Thiagarajan, G.
In this paper, a comprehensive theoretical, numerical and computational investigation based on the analysis of the Parkfield earthquakes will be carried out with the main focus directed at the understanding on how physical and chemical transport phenomena, creep deformation with preseismic, coseismic, postseismic and interseismic periods including steady-state static creep, diffusional creep, cyclic creep and dynamic creep, large strains, tension/compression creep asymmetry, creep dilatancy, active creep damage state (degradation) and passive creep damage state (healing), cyclic variations of velocities in boundary conditions, and tectonic loading history affect fault sliding, seismic activity in the crust surrounding a fault including accelerated seismic release characterized by cumulative Benioff strain, spatiotemporal seismicity patterns, large earthquake cycle on the fault as well as future destructive events. Furthermore, focus is put on how the diffusion, preseismic, coseismic, postseismic and interseismic creep processes, large strains, creep damage evolution including degradation and healing, movement of the front of creep rupture, boundary conditions as well as tectonic loading history may be modeled inorder to understand the workings of the Parkfield earthquakes and to predict new destructive earthquakes within a much shorter time frame than currently possible.
An integrated approach to the analysis of creep, chemical expansion, creep damage and lifetime reduction for solid oxide fuel cells
(NTU "KhPI", 2007) Zolochevsky, A.; Hyde, T. H.; Zhaoji, Hu
In this paper, a comprehensive theoretical and numerical investigation has been carried out with the main focus directed at the understanding on how electrochemical transport phenomena, diffusional creep and chemical expansion in electrochemical ceramics affect creep damage growth and lifetime reduction for Solid Oxide Fuel Cell systems. Furthermore, focus is put on how the electrochemical diffusion, creep process, chemical expansivity as well as the creep damage growth in ceramic substances may be controlled in order to reduce stack degradation below 0.1%/1,000 hours, optimize cell, stack design and operating conditions, and extend stack lifetime above 40,000 hours for stationary applications and above 5,000 hours for transportation applications.
Sodium penetration and chemically induced stresses in the hollow cylinder of Rapoport-Samoilenko apparatus – I. Constitutive modeling
(NTU "KhPI", 2007) Zolochevsky, A.; Goncharova, G.
In this paper, a comprehensive theoretical investigation has been carried out with the main focus directed at the understanding on how sodium penetration and chemical expansion in the cathode material during aluminum electrolysis affect the time dependent and chemically induced stress distribution in the hollow cylinder of the Rapoport-Samoilenko apparatus. Constitutive modeling of chemical and mechanical phenomena has been given, and the formulae of stress distribution in the cylinder of the apparatus have been obtained.
Сhemically induced stresses in the cathode of single chamber solid oxide fuel cell
(НТУ "ХПИ", 2007) Zolochevsky, A.; Tkachuk, N. N.; Viricelle, J.-P.; Pijolat, C.
A relation between diffusion of the oxygen ions, chemical expansion in electrochemical ceramics, and chemically induced stress evolution in the cathode over time for the Single Chamber Solid Oxide Fuel Cell based on the miniaturisation concept using thick films produced by screen-printing method has been established. The proposed model has been used to calculate the time dependent stress distribution in the cathode as a function of the material parameters, geometrical parameters of the cathode, and concentration of the oxygen ions under steady state operating conditions of the Single Chamber Solid Oxide Fuel Cell.