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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 122
Ráž, Karel , Štěpánek, Martin , Chval, Zdeněk
Topological optimization of the milling head

This article describes the usage of the topological optimization in the process of designing a milling head. A modern milling head (innovative design with the beam structure) with an internal coolant supply was chosen. The useful properties of the head were increased with the ...

Bystrianský, Martin , Bunda, Zbyněk , Mentl, Václav , Volák, Josef , Kučerová, Ludmila
Zobrazení tahové zkoušky oceli ČSN 416236 z rotoru parní turbíny in-situ v ŘEM

In-situ tensile testing of a 27CrNiMoV alloy which is used for steam turbine rotors was carried out using scanning electron microscope (SEM). Deformation and crack formation and propagation was examined using this test. Small (45 x 10 x 1,5 mm, with gauge length 25 ...

Kepka, Miloslav , Kepka, Miloslav
Forced Vibration of Bus Bodyworks and Estimates of Their Fatigue Damage

Driving a road vehicle on uneven roads causes its bodywork to vibrate. The vibration of the bodywork can result in fatigue damage of critical bodywork nodes. In the case of buses (trolleybuses, battery electric buses), the critical structural nodes are welds of thin-walled profiles...

Marková, Věra , Ráž, Karel
Statistical evaluation of fatigue curve of vibration-loaded structures

The paper deals with the description of statistical evaluation of fatigue of vibration-loaded structures. Fatigue tests are performed in laboratories on so-called vibrating tables, the results are then analysed using the construction of fatigue curves. The analysis includes several statistical me...

Vlasák, Tomáš , Neumannová, Šárka , Kec, Jan , Poloch, Adam , Černý, Ivo , Zetek, Miroslav
Vliv technologie 3D tisku na vlastnosti materiálu INC 718

3D printing technology is a modern way of producing metal parts with great potential for application in many industries. The advantage of this method is the possibility of achieving the final form and structurally complex parts without further technological operations. This paper ...

Kepka, Miloslav , Kepka, Miloslav
Parametric calculations of service fatigue life of welded T-joint

The paper describes parametric fatigue life calculations of a simple welded node occurring in agricultural machines. S-N curves were determined experimentally for various materials and welding parameters and design stress spectra were estimated. It was possible to approximately quantify the diffe...

Dewa, Rando Tungga , Kim, Seon.Jin , Kim, Woo-Gon , Kim, Eung-Seon
Uniaxial Low-Cycle Fatigue Study of Alloy 800H Weldments at 700 °C

Alloy 800H is currently under consideration to be used in a very high temperature reactor system. This paper describes the experimental low-cycle fatigue study on Alloy 800H base metal and weldments in the air with fully-reversed strain control at 700 degrees C. The recommended...

Žlábek, Pavel , Koščo, Tomáš , Semeš, Marián
Fatigue properties of weld joint of gas pipelines

Pipeline systems as well as pressure vessels under operation, possess some sections or junctions in which the operation conditions are different to those which were considered during the design stage. These places are usually booster pump stations or compressor stations where there are&...

Rubešová, Kateřina , Peković, Michal , Jirková, Hana , Hradil, David
Grain refinement in hypereutectoid steel by semi-solid processing followed by mechanical working

Research into new forming methods has yielded new techniques of altering the microstructure in hypereutectoid steels. An innovative approach to processing can lead to improved mechanical properties thanks to elimination of problematic and undesirable sharp-edged carbides which are very difficult ...

Jirková, Hana , Janda, Tomáš , Růžička, Jan , Mach, Josef , Volkmannová, Julie
Effect of holding time at stabilization annealing on properties of 08CH18N10T austenitic stainless steel

Titanium-stabilized austenitic stainless steel 08Ch18N10T is often used in nuclear power due to its properties. The parts of the primary circuit of the nuclear reactor are manufactured from this steel, so the material must achieve both very good corrosion resistance and thermal stabilit...

Kepka, M. , Kepka, M. jr. , Minich, R. , Žlábek, P.
Practical notes on the evaluation of fatigue life of welded nodes of bus bodyworks

Sýkora, Jindřich
Additive manufacturing of unmanned aerial vehicle

The objective of this paper is to design a process of manufacturing an unmanned aerial vehicle. The evaluated aircraft will be the ‘Bubak’ which belongs to the A3 category. This aircraft is usually made out of balsa wood and plywood and its wings are covered with air...

Špirk, Stanislav , Vychytil, Jan , Špička, Jan
Simulation of tram-pedestrian collision with validated windshield material model

The rail industry has been significantly affected by the passive safety technology in the last few years. The tram front-end design must fulfil the new requirements for pedestrian passive safety performance in the near future. The requirements are connected with a newly prepared te...

Vostřák, Marek , Hajšman, Jan , Hruška, Matěj , Keslová, Anna
Comparison of mechanical properties of laser cladded WC and (TIW)C1-X IN NI based alloy coatings

For wear demanding applications, the metal matrix composites (MMC) are often used due to their high wear resistance, and the tungsten carbide is often used as hard reinforcing particles. Nevertheless, there are still some limits of WC, mainly its deterioration due to heat load ...

Chval, Zdeněk , Ráž, Karel , Aguiar, Icaro Almeida
Topology Optimization of B-pillar with Respect to Mesh Type and Size

This paper deals with the influence of different mesh types and element sizes in topology optimization. Meshes from brick elements, tetrahedral elements and combination of both of them were compared in sizes 20, 10 and 7mm. B-Pillar, structural car component, is used here in o...

Jirková, Hana , Vrtáček, Jiří , Peković, Michal , Janda, Tomáš , Kučerová, Ludmila
Influence of chromium and niobium on the press-hardening process of multiphase low-alloy TRIP steels

Press-hardening is an intensively developing forming technology which is mainly used for the production of car body parts. Because it is a hot forming technology, small forming forces can be utilized and, due to the lower spring-back effect, more accurate products are achieved. In&...

Jirková, Hana , Opatová, Kateřina , Jeníček, Štěpán , Kučerová, Ludmila
Combination of press-hardening and isothermal holding in the treatment of high-strength steels

Today, high-strength parts for the automotive industry are mainly produced by the press-hardening technology. In order to reduce costs, savings in production and optimal materials are sought. One option involves the use of high strength steels of various chemical compositions. Two high ...

Tittel, Jan , Kepka, Miloslav , Heller, Petr
Static and dynamic testing of a bogie

The aim of this research is static and dynamic testing of a functional bogie model by hydraulic cylinders and subsequent evaluation of measured values. The load is determined according to the requirements specified in ČSN EN 13749, Railway applications – Wheelsets and bogies – ...

Opatová, Kateřina , Kučerová, Ludmila , Zetková, Ivana
Methodology for observation of maraging tool steel after 3D printing using FIB and STEM mode

The components of the maraging tool steel produced by 3D printing are further heat-treated after printing. It includes a stress relief annealing and precipitation hardening. During this process precipitates of Ni3Ti and Fe2Mo or Fe7Mo are formed, which significantly contribute to an inc...

Kučerová, Ludmila , Burdová, Karolína , Stehlík, Adam
Effect of soaking temperature on the microstructure and mechanical properties of heat-treated Al-Si-Nb TRIP steel

Two-step heat treatment with bainitic hold at 425 °C was applied to low alloyed high strength steel with partial substitution of silicon by aluminium. The steel was further micro-alloyed by niobium. Various soaking temperatures in the range of 750-1250 °C were used to analyse ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 122