Completed National Research Projects

Project Name Modern Trends in Increasing the Reliability of the Equipment for Industrial Minerals Surface Mining
Principal Investigator Prof. Ing. Stanislav Vejvoda, CSc.
Project NumberFT-TA4/018
Start2007
Completion2010
Financial supportThe state budget provided by the Ministry of Industry and Commerce
Project Name Increasing the Safety of Petrochemical Product Storage Tanks
Principal Investigator Ing. Ivo Šafář, Ph.D.
Project Number2A-2TP1/101
Start2007
Completion2010
Financial supportThe state budget provided by the Ministry of Industry and Commerce
Project Name Numerical Welding Process Verification
Principal Investigator Ing. Lubomír Junek, Ph.D.
Project NumberFT-TA3/004
Start2006
Completion2009
Synopsis The main motivation for setting up the project was the lack of prediction tools combining experimental measurements and numerical simulations which would make it possible to prevent limit states in construction materials used in equipment potentially dangerous and hazardous to the environment. The main purpose of the project therefore was to prepare such tools. Another partial goal was to conduct research in the field of virtual welding simulations, validate them and make them as real as possible with the aim of determining, by a numerical method, the residual stresses and distortions induced by welding. Thanks to numerical analyses, it is possible to optimize the welding technology with regard to the resulting process parameters. When freely laid parts are being welded, large distortions occur in the structure, however, residual stresses are low. On the other hand, when solid, tightly fixed structures are being welded, distortions are reduced to a minimum but inner stresses are high. It is the designer and welding engineer who have discretion to give priority to inner stress or to structure distortion. It is usually assumed that it is possible to prevent distortions in easily weldable steel by adopting appropriate measures concerning the structure and technology. However, it is necessary to reduce residual stresses in less easily weldable steel to a minimum even at the expense of larger structure distortions which have to be subsequently eliminated by structure straightening and larger additions to be machined.

Based on the operational experience (gas industry, large-scale storage tanks, power engineering), it is clear that equipment can be operated for several years even if it contains defects considered inacceptable by respective standards for production and welding. When deciding on further operation of such equipment, not only the size of the defect but also operating conditions must be taken into consideration which are decisive for possible further development of the defects. Finally, a suitable evaluation methodology of defects in weld joints found in operation must be devised and the possibility of further operation of the equipment containing the defect must be examined, as immediate suspension of the operations of non-redundant equipment is very expensive. The methodology has been designed to make the evaluation in compliance with the technological procedure of welding, structure loading and size of defect found.
Resultsnumericke_procesy_svarovani.pdf
Financial supportThe state budget provided by the Ministry of Industry and Commerce
Project Name Materials Thermal Fatigue in Chemical and Nuclear Industries
Principal Investigator Ing. Lubomír Junek, Ph.D.
Project NumberFT-TA1/011
Start2004
Completion2006
Synopsis This project was initiated by the industries that face the problem of materials degradation in operation due to loading in the form of abrupt repeated temperature changes. Such equipment can be found in nuclear power generation as well as in petrochemical industry. The most typical examples for both the above industries are the connection areas of fluid systems where cold and hot media are being mixed. The growing interest in thermal fatigue is being generated by increasing frequency of occurrence of this type of damage in the above industries. The results of current practice show that undesirable defects may occur when components are exposed to repeated heating and cooling. The most frequent defects are cracks in the exploited surface of a part that can finally lead to the complete destruction of integrity of the unit due to a fracture.

The research project was triggered by increased frequency of this damage in energy circuits. The analysis of available information about events connected with the occurrence of thermal fatigue in power engineering indicates that the issue of thermal fatigue has not been included in the design for the equipment or installation before. The forced shutdown of the Civaux 1 nuclear power plant in France in 1998 has probably become the best known incident caused by materials degradation induced by thermal fatigue. Due to high-cycle fatigue resulting from turbulent flow in the course of media mixing of different temperatures and speeds, a crack appeared and subsequently spread owing to fatigue through the whole width of a wall, which lead to the primary coolant leakage. The phenomenon of thermal fatigue arising from media mixing frequently occurs also in petrochemical industry where the differences between the temperatures of cool and hot media may be even greater than in energy circuits of nuclear power plants.
Resultstepelna_unava_materialu.pdf
Financial supportThe state budget provided by the Ministry of Industry and Commerce
Project Name New Technology of Increasing the Reliability and Safety of Pressure Systems and Steel Structures
Principal Investigator Prof. Ing. Stanislav Vejvoda, CSc.
Project Number2A-1TP1/107
Start2006
Completion2011
Financial supportThe state budget provided by the Ministry of Industry and Commerce
Project Name Components and Technology of Fusion Reactors
Principal Investigator Ing. Lubomír Junek, Ph.D.
Project Number2A-1TP1/101
Start2006
Completion2011
Financial supportThe state budget provided by the Ministry of Industry and Commerce
Project Name Research of dissimilar metals weds behavior on NPPs and their welding repair developing
Principal Investigator Ing. Lubomír Junek, Ph.D. a kolektiv ÚAM Brno
Project Number
Start2011
Completion2013
Financial supportCEZ, a.s.
Project Name Influence of environmental effect to fatigue evaluation of NPP equipment
Principal Investigator Ing. Libor Vlček, Ph.D.
Project Number
Start2010
Completion2012
Financial supportCEZ, a.s.
Project Name Methodology of defect acceptability evaluation in dissimilar metal welds during NPP operation
Principal Investigator Ing. Ladislav Jurášek, Ph.D.
Project NumberTB03SUJB001
Start2014
Completion2015
Financial supportTA CR
Project Name Assessment and prediction of fatigue life of welding joints exposed to corrosion environment of primary cooling medium
Principal Investigator Ing. Libor Vlček, Ph.D.
Project Number
Start2013
Completion2015
Financial supportCEZ, a.s.
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