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	Evaluation of documentation on assessment of four selected cases assessing found indications in welds on NPP equipment Pták, Svatopluk ; Masák, Jan ; Gabriel, Dušan The report is focused on an evaluation of a documentation on the assessment of four selected cases assessing found indicators in welds on Czech NPP equipment. The chosen approach to the assessment of the specific finding is thoroughly evaluated for each of the four selected cases. Detailed record
	Methodology for modeling of dynamic processes by finite element method - Phase I Kolman, Radek ; Gabriel, Dušan ; Červ, Jan ; Plešek, Jiří In the report, the using of explicit finite element analysis for solving wave propagation problems in solids is presented in depth. Its grid and full dispersion analysis is given with the influence of mesh size and time step size. Conclusion of the report summarizes criteria for mesh size and time step size settings so that dispersion errors do not exceed permissible values. Detailed record
	Dispersion properties of finite element method: review Kolman, Radek ; Okrouhlík, Miloslav ; Plešek, Jiří ; Gabriel, Dušan Review of the dispersion properties of plane square bilinear finite element used in plane elastic wave propagation problems is presented. It is assumed the grid (spatial) dispersion analysis and, further, the temporal-spatial dispersion analysis for explicit direct time integration based on the central difference method. In this contribution, the dispersion surfaces, polar diagrams and error dispersion graphs for bilinear finite element are depicted for different Courant numbers in explicit time integration. Finally, recommendation for setting the mesh size and the time step size for the explicit time integration of discretized equations of motion by the bilinear finite element method is provided. Detailed record
	Performance and implementation aspects of an isogeometric mortar-based contact algorithm Kopačka, Ján ; Gabriel, Dušan ; Kolman, Radek ; Plešek, Jiří The isogeometric NURBS based variant of symmetry preserving explicit FE contact-impact algorithm, has been proposed. The algorithm was studied by means of a numerical example, which involves 3d frictionless impact of two equally shaped cylinders. The attention was paid to performance and implementation aspects of the mortar-based contact algorithm. Detailed record
	Creep Analysis of the High Pressure Inner Vessel DSPWR - comparison of creep models Masák, Jan ; Gabriel, Dušan ; Hrubý, Zbyněk ; Plešek, Jiří The report summarizes the results of II. stage creep analysis of the High Pressure Inner Vessel DSPWR. In the first part of the report two standard creep models are briefly introduced describing the secondary stage creep (Norton's law) and primary stage creep (Norton-Bailey's law), including the verification of results. In the second part of the report the results of all calculations on the High Pressure Inner Vessel are presented using considered creep models. Detailed record
	Case study using the creep probabilistic exponential model and explicit integration method with time step control Gabriel, Dušan ; Hrubý, Zbyněk ; Masák, Jan ; Plešek, Jiří ; Kopačka, Ján ; Pařík, Petr ; Straka, F. ; Albl, P. The issues concerning accuracy and stability control of original explicit algorithm for integration of differential systems arising from viscoplastic or creep finite element analyses was explored. The attention was focused on the investigation of the numerical stability for complex creep probabilistic exponential model with damage. Detailed record
	Internal corporate methodology for optimal dimensioning and utilization of screw joints Pařík, Petr ; Kolman, Radek ; Gabriel, Dušan The report summarizes the internal methodology for the optimum design of screw connections according to standard VDI 2230. Detailed record
	Computational design of ventilation system of air cooled generator Kotalík, P. ; Ferfecki, Petr ; Novotný, Jaroslav ; Gabriel, Dušan The results of computational design of ventilation system of air cooled generator were presented including the prediction of air flow in different branches and airgap between the stator and rotor. The simplified CFD models in software OpenFOAM were proposed. Detailed record
	Creep Analysis of the High Pressure Inner Vessel DSPWR - 2014 Summary Hrubý, Zbyněk ; Gabriel, Dušan ; Kopačka, Ján ; Plešek, Jiří The scope of the presented technical report is thermal, static, and creep analyses of the high pressure inner vessel DSPWR. FE-mesh altogether with thermal and structural load was supplied by the contractor. Results are presented in terms of thermal and stress fields as well as residual deformation in the parting plane after unload, cooling, and disassembly. Detailed record
	Isogeometric contact analysis: a study of an explicit dynamic contact algorithm Kopačka, Ján ; Gabriel, Dušan ; Kolman, Radek ; Plešek, Jiří The isogeometric NURBS based variant of symmetry preserving explicit FE contact-impact algorithm, has been proposed. The algorithm was studied by means of a numerical example, which involves 2d frictionless dynamic Hertz contact problem of two equally shaped cylinders. The attention was paid to the influence of different lumping techniques on the oscillations of contact force and contact pressure. The standard Lagrange finite elements were compared with the NURBS isogeometric elements. Both the first and second order were considered. Detailed record

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2	Gabriel, David

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