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prof. Ing. Josef Jíra, CSc.

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Projects and Grants

The information comes from the university database V3S.

Principal Investigator:
Ing. Michaela Jurko
Co-Investigators:
prof. Ing. Josef Jíra, CSc.
Annotation:
Suggested project is focused on experimental analysis of mechanical properties of additively manufactured (AM) metal structures fabricated with laser powder bed fusion (LPBF) method. Static, dynamic and low-cycle fatigue properties of thin structures produced with austenitic stainless steel 316L will be evaluated. The microstructure of the metal powder as well as the 3D printed material will be analyzed with utilization of scanning electron microscopy (SEM) and micro computed tomography (micro-CT). These imaging methods will be utilized to investigate the intact specimens as well as the specimens after deformation. The results of the experimental investigations will be employed in fitting the parameters of Johnson-Cook (JC) material model which can be further used for reliable predictions of mechanical behaviour of additively manufactured structural parts. A set of validation experiments to assess the accuracy of the JC model will be performed.
Department:
Department of Mechanics and Materials
Year:
2021 - 2022
Program:
Studentská grantová soutěž ČVUT - SGS21/131/OHK2/2T/16

Principal Investigator:
Ing. Marcel Adorna
Co-Investigators:
prof. Ing. Josef Jíra, CSc.
Annotation:
The project is focused on development of advanced Digital Image Correlation (DIC) algorithms for evaluation of experimental data assessed during high strain-rate loading using in-house Hopkinson Bar apparatus. Proposed project will mainly focus on upgrading already existing DIC software package, implementation of new algorithms for precise evaluation of large deformation of tested structures. Algorithms for calibration of pair of high-speed cameras allowing evaluation of deformation fields on the whole surface of tested specimens will also be implemented. Direct output of proposed project will be complex software solution which will be usable for all modification of Hopkinson Bar apparatus.
Department:
Department of Mechanics and Materials
Year:
2020 - 2021
Program:
Studentská grantová soutěž ČVUT - SGS20/141/OHK2/2T/16

Principal Investigator:
Ing. Michaela Jurko
Co-Investigators:
prof. Ing. Josef Jíra, CSc.
Annotation:
Suggested project is focused on optimization of selected parameters of a metal 3D printing method for effective production of auxetic structures with optimal geometry. Metal 3D printing has a great potential to be used for production of construction parts with complex geometry. The production method's current limitations arise from volatility and uncertainty in mechanical properties of 3D printed material. In connection with that, the project focuses on optimization of key parameters of metal 3D printing with selective laser sintering method. Optimized 3D printing process allows to produce the final 3D printed material with desired quality and guarantees reliability of the production method. Based on a broad experimental investigation, detailed description of mechanical behaviour of optimized 3D printed material will be obtained. Experimentally estimated mechanical properties will be further used in settings of numerical simulations of deformation behaviour of selected auxetic structures. Proper settings of numerical models allow correct simulation and prediction of mechanical properties of real structures. Thus, it will be possible to perform a reliable process of numerical optimization of structures geometry to obtain specific mechanical properties. Another experimental campaign within the project will verify the simulated mechanical properties of optimized auxetic structures manufactured using the optimized method of metal 3D printing. The project thematically corresponds to the research topic of applicant's dissertation. Moreover, the project follows the national GAČR (GA15-15480S) project focused on study of deformation behaviour of auxetic structures. Within this project, a metal 3D printing was used for production of auxetic structures, but the project was not focused on optimization of the production method. However, it was found out that the optimization is a necessary condition for reliable 3D printing of auxetic structures with specific mechanical proper
Department:
Department of Mechanics and Materials
Year:
2019 - 2020
Program:
Studentská grantová soutěž ČVUT - SGS19/123/OHK2/2T/16

Principal Investigator:
Ing. Marcel Adorna
Co-Investigators:
prof. Ing. Josef Jíra, CSc.
Annotation:
The project is focused on development of advanced software toolbox for evaluation of experimental data assessed during high strain-rate loading using Split Hopkinson Pressure Bar (SHPB). Proposed project will mainly focus on upgrading already existing software tools to create complex, modular and easily modifiable solution which would allow effectively evaluate experimental data by using appropriate suitable software tools. Closed sets of specific functions will be created in order to utilize evaluation of data assessed by repetitively used experimental setup. New methods of data evaluation will also be implemented within the complex solution, such as digital image correlation (DIC). Results of newly implemented evaluation methods will be also directly compared with currently used methods. Advanced dispersion correction techniques will be introduced as well as other methods of experimental data corrections. Proposed solution will be completed with detailed software documentation, its own website and graphical user interface.
Department:
Department of Mechanics and Materials
Year:
2018 - 2019
Program:
Studentská grantová soutěž ČVUT - SGS18/153/OHK2/2T/16

Principal Investigator:
Ing. Jan Falta
Co-Investigators:
prof. Ing. Josef Jíra, CSc.
Annotation:
The subject of the proposed project is the analysis and realization of reactive force measurements during fast dynamic processes on split Hopkinson pressure bar and its modifications. Initial part of the project is the design and realization of components related to the recording reactive force of deformation pulse by load cells in cooperation with existing instrumentation using strain gauge sensors. The experimental part will include design, manufacture and subsequent adaptation of the load cells to the given measuring devices, further calibration to verify the applicability and accuracy of the solution. In the final phase of the project, the different methods of recording reaction forces will be compared with the existing and newly implemented sensors. The results of this project will serve to optimize the measurement of the properties of advanced materials in the field of dynamic loads usable in transport and other applications.
Department:
Department of Mechanics and Materials
Year:
2018 - 2019
Program:
Studentská grantová soutěž ČVUT - SGS18/154/OHK2/2T/16

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Co-Investigators:
prof. Ing. Ondřej Jiroušek, Ph.D.; doc. Ing. Jitka Jírová, CSc.; Ing. Jiří Kunecký, Ph.D.; doc. Ing. Daniel Kytýř, Ph.D.; Ing. Jan Vyčichl, Ph.D.
Annotation:
Vědecké setkání účastníků z vysokých škol a vědeckých ústavů z České republiky a ze SRN ve dnech 28.5. a 30.5.2008 v konferenčním centru AV ČR - zámek Liblice u Mělníka. Symposium je zařazeno do kalendáře konferencí ČVUT a je zaměřeno na rozvoj experimentálních metod a výpočtového modelování v mechanice. Tato bilaterální symposia mají dlouholetou tradici a jsou pořádána od roku 1985 ve spolupráci s Bergische Universitat ve Wuppertalu v SRN pravidelně každé 2 roky a střídavě v SRN a České republice. Na odborné náplni symposia se podílí ÚTAM AV ČR, Česká společnost pro mechaniku a VDI/VDE-GESA. Jednacím jazykem je angličtina a každý účastník se musí zúčastnit aktivně s referátem, který je vydán ve sborníku sympozia. Cílem symposia je zajistit setkání a výměnu zkušeností zejména mezi mladými vědci z obou zemí a podpořit bilaterální vědeckou spolupráci. www.bilateral2008.fd.cvut.cz
Department:
Department of Mechanics and Materials
Year:
2008 - 2008
Program:
IGS ČVUT - CTU0815216

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Annotation:
Transportation networks in interaction with environment. Spatial and construction arrangement of traffic roads. Improving the quality of transportation in urban areas. Metodics of transport road routing with respect to the optimal traffic service, ecology and increasing safety of operation Optimization of network structure of transport and logistic service. Managing regional transport processes. Optimization of system connections between means of transport, logistics and multimodal transportation. Development of national transport infrastructure in dependency on the EU transport concept. Safety of transport routes and vehicles. Complex analysis of traffic accidents and prevention. Influence of human factor in transportation, injury biomechanics, development of the protection elements and safety regulations. Increasing active and passive safety. System solution of the mobility of handicapped people.
Department:
Department of Mechanics and Materials
Year:
2007 - 2013
Program:
Výzkumné záměry

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Annotation:
Innovative Track Systems
Department:
Department of Mechanics and Materials
Year:
2006 - 2009
Program:
Projekty rámcových programů EU - TIP5-CT-2006-031415O

Principal Investigator:
Ing. Leoš Horníček, Ph.D.
Co-Investigators:
prof. Ing. Josef Jíra, CSc.
Department:
Department of Railway Structures
Year:
2006 - 2009
Program:
Projekty rámcových programů EU - TIP5-CT-2006-0314150

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Annotation:
A finite element (FE) model of the human skull will be built using data from computer tomography scans and by means of the voxel method and programme ANSYS. The mathematical model of skull will be very detailed and must enable to describe variablethickness and material properties relatively accurate. The varying thickness of the skull is an important feature of FE model since the variation in skull thickness is significant, extending from the frontal bone to the thin temporal bones. Also thevariable material properties will be a significant improvement, since in the frontal bone the spongy bone is very porous compared to thin regions, e.g. in the temporal part. The skull models will be used in numerical modelling of head impact duringtraffic accidents.The finite element (FE) model can help to describe possible injury mechanisms and quantify design parameters of protective helmet related to a specific impact event. These FE models will be used in determination of the influence of the
Department:
Department of Mechanics and Materials
Year:
2005 - 2007
Program:
Standard projects

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Department:
Department of Mechanics and Materials
Year:
2005 - 2005
Program:
Výzkumné zámery - kat. C a D (nejsou v CEPu) - MSM6840770025

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Department:
Department of Mechanics and Materials
Year:
2005 - 2005
Program:
MŠMT - projekty Fondu rozvoje vysokých škol (FRVŠ) - 3291/2005

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Co-Investigators:
Blanka Budská; prof. Ing. Ondřej Jiroušek, Ph.D.; doc. Ing. Jitka Jírová, CSc.
Annotation:
Vědecké setkání účastníků z vysokých škol a vědeckých ústavů z České republiky a ze SRN ve dnech 16. až 19.6.2004 v Táboře, které je zaměřeno na rozvoj experimentálních metod a výpočtového modelování v mechanice. Tato bilaterální symposia mají dlouholetou tradici a jsou pořádána od roku 1985 ve spolupráci s Bergische Universitat ve Wuppertalu, SRN pravidelně každé 2 roky a střídavě v SRN a České republice. Jednacím jazykem je angličtina a každý účastník se musí zúčastnit aktivně s referátem, který je vydán v anglickém sborníku sympozia. Cílem symposia je také zajistit setkání a výměnu zkušeností mezi mladými vědci z obou zemí a tak podpořit bilaterální vědeckou spolupráci. V referátech budou zastoupeny příspěvky z oblasti záznamu a vyhodnocování experimentálních dat, rozvoje a využití experimentálních metod a měřících zařízení v mechanice tuhých a poddajných těles a v biomechanice a vztahu experimentu a výpočtového modelování (hybridní metoda).
Department:
Department of Mechanics and Materials
Year:
2004 - 2004
Program:
IGS ČVUT - CTU0416516

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Department:
Department of Mechanics and Materials
Year:
2001 - 2001
Program:
IGS ČVUT - 300113016

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Annotation:
The proposed grant project is of interdisciplinary character. Its solution will require the co-operation of scientists from the fields of technical and medical sciences. The project comprises the solution of complicated and time-consuming selected problems of the biomechanics of man and the replacements in the human organism. The proposed project concerns computational and experimental modelling of the behaviour of the biomechanical system: the pelvic bone - the hip joint acetabulum - the endoprosthesis. The solution of the problem will use hybrid method comparing the computational model (ANSYS programme) with experiments, thus verifying its correctness. Targets of the project: ( i ) derivation and verification of a computational model ofpelvic bone with applied acetabular cup of selected type for the analysis of local effects in the system with total hip joint endoprosthesis, (ii) discovery of places of stress concentrations to be used for the optimalization of the structure of
Department:
Department of Mechanics and Materials
Year:
2000 - 2002
Program:
Standard projects

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Department:
Department of Mechanics and Materials
Year:
2000 - 2000
Program:
MŠMT - projekty Fondu rozvoje vysokých škol (FRVŠ) - 1136/A

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Co-Investigators:
JUDr. Luďka Michálková
Annotation:
Research on methods reducing negative impacts of transport. In relation to specifying the principles of transport policy will be done research on: new forms of traffic calming; evaluation of effects of arrangements to reduce traffic accidents; capacity,Sociotechnical impacts of telematics; approaching of calculation methods and standards to European requirements in accordance with prepared unification of Czech and European regulationsTraffic models and control of transport process in areas - traffic accidents analysis; preceding of negative consequences and its removing at transport systems including human destroyingThe aim of the research in the area of transportation theory is the analysis of theoretical knowledge of network systems, firstly the research of the movement of traffic comlexes in the traffic networks and an analysis of utilisation of the new transport
Department:
Department of Mechanics and Materials
Year:
1999 - 2004
Program:
Výzkumné záměry

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Department:
Department of Vehicle Technology
Year:
1998 - 1998
Program:
IGS ČVUT - 309800306

Principal Investigator:
prof. Ing. Josef Jíra, CSc.
Annotation:
The project is edition-type project concerned with work from the scientific field which has not been idequately developed till now and which is very significant from the viewpoint of the national economy. For gas pipelines, as large and expensive technical works, it is desirable from the viewpoint of the whole zational community that the period of their fittness for purpose without serious failures is as long as possible. During a long-time operation of gas pipelines a degradation of their mechanical properties takes place which increases the risk of serious breakdowns of the gas pipelines. The publication will summarize the results and experience as obtained from the study of failures of gas pipelines, as well as from theoretical and experimental investigations into the damaging and degrading processes taking place in pressure gas pipelines on one side, and the resistance of these linepipes against damage and catastrophic failures on the other. A methodological procedure will be worke
Department:
Department of Mechanics and Materials
Year:
1998 - 1999
Program:
Standard projects