National Repository of Grey Literature 70 records found  beginprevious41 - 50nextend  jump to record: Search took 0.00 seconds. 
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.
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.
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.
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.
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.
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.
Comparative study of finite element method, isogeometric analysis, and finite volume method in elastic wave propagation of stress discontinuities
Berezovski, A. ; Kolman, Radek ; Blažek, Jiří ; Kopačka, Ján ; Gabriel, Dušan ; Plešek, Jiří
A comparative study of Finite Element Method, Isogeometric Analysis, and Finite Volume Method in numerical simulation of one-dimensional wave propagation problems of stress discontinuities in elastic solids is presented. The special attention is paid to accuracy, convergence, and stability of tested numerical methods and the appearance of spurious oscillations and damping effects occurring close to theoretical sharp wavefronts.
The assessment of the procedure VERLIFE 2013-Appendix C (INTEGRITY AND LIFETIME ASSESSMENT PROCEDURE OF RPV INTERNALS IN WWER NPP'S DURING OPERATION)
Gabriel, Dušan ; Pták, Svatopluk ; Hrubý, Zbyněk ; Machová, Anna ; Plešek, Jiří ; Krásný, I.
The assessment of the procedure VERLIFE 2013-Appendix C (INTEGRITY AND LIFETIME ASSESSMENT PROCEDURE OF RPV INTERNALS IN WWER NPP'S DURING OPERATION) is elaborated
The dynamic response analysis of the gate valve
Kopačka, Ján ; Gabriel, Dušan ; Plešek, Jiří
The dynamic response of the gate valve is analysed under given non-stacionary loading
Frictionless contact of elastic bodies: comparison of treatment in finite element analysi and isogeometric analysis
Kopačka, Ján ; Kolman, Radek ; Gabriel, Dušan ; Plešek, Jiří
Artificial oscillations in contact force due to non-smooth contact surface are treated by isogeometric analysis (IGA). After brief overview of B-splines and Non-Uniform Rational B-Splines (NURBS) representation, the mortar-based contact algorithm is presented in the frictionless small deformation regime. Contact constraints are regularized by penalty method. The contact algorithm is tested by means of contact patch test.

National Repository of Grey Literature : 70 records found   beginprevious41 - 50nextend  jump to record:
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2 Gabriel, David
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