Department of Engineering Mechanics – 13251
List of persons
- prof. Ing. Jindřich Petruška, CSc. – head of department
- doc. Ing. Tomáš Návrat, Ph.D.
- doc. Ing. Stanislav Věchet, Ph.D.
- doc. Ing. František Šebek, Ph.D.
- Ing. Lubomír Houfek, Ph.D.
- Ing. Petr Kubík, Ph.D.
- Ing. Petr Vosynek, Ph.D.
- Ing. Dávid Halabuk, Ph.D.
The Department of Engineering Mechanics focuses on experiments, computations, and consultations related to the assessment of reliability and possible optimization of machines based on clients’ requirements, research and development of the conditions in ductile failure and their application to the finite element method codes and assessment of residual stress. Members of the research group also deal with research and development projects and cooperate with industry partners (ABB, s.r.o., ŽĎAS, a.s., Edwards, s.r.o., Poličské strojírny, a.s., Technistone, a.s., ArcelorMittal Ostrava a.s. and others).
The ductile failure and forming operation simulations group focuses on the prediction of ductile fracture of polycristelline metal materials under monotonic loading. It is a description of the development of damage in a given body using either simple phenomenological criteria or the continuum damage mechanics. The research includes the development of ductile failure models, proposal of calibration samples and actual calibration of models and their use for predicting cracks. The group intensively studies the behaviour of super duralumin and also steel – carbon, stainless and reactor steel, which were used to formulate the original criteria and publish it successfully in prestigious journals. Calibration samples for calibrating such criteria may either have the geometry of standard cylindrical bodies for testing by tension or a uniquely designed geometry for achieving a specific stress condition. An example of such original sample may be a cylinder with a notch or groove designed for testing in compression. The models mentioned above may afterwards be used mainly for simulations of technological operations such as shearing or extrusion. The topic of ductile failure may be extended or developed in the sphere of cyclic plasticity models, especially for (extremely) low-cycle loading. A great deal of mechanical components are not strained only monotonously – which may be closer to an emergency state – but rather cyclically. As an example, the reactor pressure vessels in a nuclear power plant primary loop can be taken as they only undergo several cycles in their lifetime but sustain a considerable deformation.
We collaborate with FS and FJFI ČVUT in Prague, ÚAM Brno, COMTES FHT and ŠKODA JS in basic and applied research.
Contact: prof. Ing. Jindřich Petruška, CSc.
The residual stress group deals with the theoretical aspects and practical realization of residual stress measurement using the drilling method particularly in situations which are still problematic for several different reasons. The problem is to correctly detect errors of the evaluated residual stresses in plasticised material in the neighbourhood of a drilled hole if the hole position is eccentric in relation to the centre of the rosette strain gauge, or as a result of lack of knowledge of material properties.
Contact: doc. Ing. Tomáš Návrat, Ph.D.
In dynamics we are concerned with the analysis of vibrations, prediction of resonance states and optimization of structures in order to reduce undesired vibrations.
The crucial areas are as follows:
- rotor dynamics (electromotors, steam turbines),
- dynamics of blades and bladed wheels,
- computational modal analysis, harmonic analysis, transient analysis,
- response to excitation by random processes.
Contact: Ing. Lubomír Houfek, Ph.D.
