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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 69
Valíček, Jan , Harničárová, Marta , Řehoř, Jan , Kušnerová, Milena , Kučerová, Ludmila , Gombár, Miroslav , Fulemová, Jaroslava , Filipenský, Jan , Hnátík, Jan
Thermodynamics and Mechanics of Thermal Spraying of Steel EN 10060 Substrate with NiCrBSi Alloy after Milling

The objective of this paper is to present a new way of identifying and predicting the relationship between thermodynamic and physical-mechanical parameters in the formation of a layer after spraying on a substrate with NiCrBSi alloy and its subsequent processing by milling. The mil...

Khalaj, Omid , Jirková, Hana , Stehlík, Adam , Volkmannová, Julie , Svoboda, Jiří
The Effect of Heat Treatment on the Mechanical Behavior of Fe-Cr-Al based OPH Alloy

The Fe-Al Oxide Precipitation Hardened (OPH) alloy is new generation of Oxide Dispersion Strengthened (ODS) alloys which is famous group of material based on their high temperature properties. The general production process of OPH alloys consists of a mechanical alloying process to crea...

Khalaj, Omid , Jirková, Hana , Burdová, Karolína , Kučerová, Ludmila , Stehlík, Adam , Vrtáček, Jiří , Svoboda, Jiří
Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy

Two oxide precipitation hardened (OPH) Fe-Al-O-based steels were prepared by mechanical al-loying. In addition to the variant using yttria nano-precipitates to improve the mechanical properties, a variant using only alumina precipitates for strengthening was also prepared. Therefore, a more economical...

Špirk, Stanislav , Špička, Jan , Vychytil, Jan , Křížek, Michal , Stehlík, Adam
Utilization of the Validated Windshield Material Model in Simulation of Tram to Pedestrian Collision

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

Kalina, Tomáš , Špirk, Stanislav , Sedláček, František
Experimental Testing of Basic Crash Elements Made of CFRP by Additive Technologies

This paper deals with the experimental testing of the basic crash elements which are made of PA6 with short carbon fiber reinforcement by additive technology. Additive technologies allow the production of very complex, thin-walled and hollow shapes, which can be used to tune the&#x...

Valíček, Jan , Harničárová, Marta , Řehoř, Jan , Kušnerová, Milena , Fulemová, Jaroslava , Gombár, Miroslav , Kučerová, Ludmila , Filipenský, Jan , Hnátík, Jan
Milling of Complex Surfaces of EN 10060 Steel after HVOF Sprayed NiCrBSi Coatings

The high-velocity oxy-fuel spraying process was used to investigate and improve the surface properties of a workpiece. The research was focused on the spherical surface of a workpiece made of high-strength steel, a ball and socket assembly. After spraying with a nickel alloy, the&#...

Khalaj, Omid , Saebnoori, Ehsan , Jirková, Hana , Chocholatý, Ondřej , Kučerová, Ludmila , Hajšman, Jan , Svoboda, Jiří
The effect of heat treatment on the tribological properties and room temperature corrosion behavior of Fe-Cr-Al based OPH Alloy

The microstructure, mechanical, tribological, and corrosion properties of Fe-Cr-Al-Y-based Oxide Precipitation Hardened (OPH) Alloy at room temperature are presented. Two OPH alloys with a composition of 0.72Fe–0.15Cr-0.06Al-0.03Mo–0.01Ta –0.02Y2O3 [& 0.03Y2O3] (wt. %) were prepared by mechanical alloying w...

Bublíková, Dagmar , Jirková, Hana , Rubešová, Kateřina , Bunda, Zbyněk
Investigation into Damaged Gear of Off-Road Motorcycles

If failure occurs in gear wheels in a racer motorcycle gearbox, the possible causes are manifold: inadequate material, improper care (poor lubrication, incorrect assembly) or inadequate thermochemical treatment procedure. This investigation focused on spur wheels of chromium-nickel Czech Standard (ČSN...

Hanzl, Pavel , Rulc, Vojtěch , Purš, Hynek , Zetek, Miroslav , Zetková, Ivana
Lightweight Design of Milling Cutter with Modified Stiffness

The conventional milling cutter design is based on a solid body. A cutter designed in this way has a guaranteed rigidity, but at the expense of tool dynamics. Computational methods of designing reduce the mass of a cutter in locations with lower stress density. This appro...

Hajšman, Jan , Kučerová, Ludmila , Burdová, Karolína
Comparison of high strength steels with different aluminium and manganese contents using dilatometry

In this paper, the properties of three low carbon steels containing different percentage of manganese (1.5 or 3 wt%) and aluminium (1.5 or 2 wt %) were tested using dilatometric analysis and metallog-raphy. The steels had chemical compositions typical for TRIP (Transformation induced&#x...

Zavřel, Martin , Kindl, Vladimír , Kavalír, Tomáš , Drábek, Pavel
Design and construction of high-quality capacitor for high frequency and power application

The paper proposes a design and construction of a special plated capacitor exhibiting very good high-frequency characteristics. The capacitor is designed to minimize the parasitic parameters like ESR (equivalent series resistance) and ESL (equivalent series inductance) and to be suitable for ...

Kepka, Miloslav , Kepka, Miloslav
Accelerated fatigue testing on special tracks as new part of methodology for bus/trolleybus development

Over the last twenty years, the Research and Testing Institute in Pilsen (former SKODA ResearchCompany) has been developing a methodology of computational and experimental investigationof strength and fatigue life of bodies of road vehicles for mass passenger transport. The metho-dology includes&...

Jeníček, Štěpán , Vrtáček, Jiří , Vorel, Ivan , Janda, Tomáš
Dilatometric identification of bainitic transformation during Q-P processing of 42SiCr medium carbon steel

Q-P process is one of the latest techniques for heat treatment of high-strength steels with increased silicon levels. It is believed to be based on diffusion and migration of carbon between martensite and untransformed austenite, where the latter becomes enriched with carbon, and t...

Ráž, Karel , Kepka, Miloslav , Volkmannová, Julie
Vibration Fatigue – Fem Analysis vs. Real Testing

Main aim of this article is to present results of the basic research in the area of the fatigue of material. The work was focused on the improvement of the computational support (for the FEM approach) for the material fatigue evaluation. Tested parts were exposed to ...

Mrvelj, Štefica , Matulin, Marco , Martirosov, Sergo
Subjective evaluation of user Quality of Experience for omnidirectional video streaming

This paper reports on the results of subjective testing of user Quality of Experience (QoE) for omnidirectional video (ODV) streaming quality. The test was conducted among 20 test subjects who watched three ODVs using a Head Mounted Display (HMD) system. The length of the vide...

Hanzl, Pavel , Zetková, Ivana , Daňa, Milan , Nozar, Martin
Advanced Simulation of Metal Additive Manufacturing Using Maraging Steel and Nickel Alloy

The melting of metal powder by a laser beam is a complex physical metallurgical process and successful processing of the whole Metal Additive Manufacturing (MAM) procedure requires complex management. Therefore, a successful result is not guaranteed. The print job is designed based on&#...

Haviar, Stanislav , Kozák, Tomáš , Meindlhumer, Michael , Zítek, Michal , Opatová, Kateřina , Kučerová, Ludmila , Keckes, Jozef , Zeman, Petr
Nanoindentation and microbending analyses of glassy and crystalline Zr(–Hf)–Cu thin-film alloys

Nanoindentation and microbending testing were used to investigate the mechanical properties of Zr(‒Hf)‒Cu thin-film alloys prepared by nonreactive magnetron co-sputtering. A detailed analysis of nanoindentation data and microscopic images of indents allowed a more precise determination of the effective...

Peković, Michal , Jirková, Hana , Rubešová, Kateřina , Janda, Tomáš , Bureš, Radovan
Microstructural Evolution in 42SiCr Steel in a High-Temperature Chamber Under Microscope Objective

Thanks to today’s computer programs, engineers can derive a large amount of information from chemical com-position of a material. This information includes phase transformation temperatures Ac1, Ac3, Ms and Mf. CCT and TTT diagrams for austenite decomposition can be determined as well. ...

Khalaj, Omid , Siabil, Seyed Mohammad A. Ghotbi , Azizian, Mehran , Tafreshi, Seyed Naser Moghaddas , Mašek, Bohuslav , Kepka, Miloslav , Kavalír, Tomáš , Křížek, Michal , Jirková, Hana
Experimental and numerical investigation of expanded polystyrene (EPS) geofoam samples under monotonic loading

The recent increase in the use of Expanded Polystyrene (EPS) geofoam in construction and geotechnical projects has driven researchers to investigate its behavior, more deeply. In this paper, a series of experimental tests to investigate the stress-strain behavior and the mechanical propertie...

Jeníček, Štěpán , Vorel, Ivan , Peković, Michal
Identification of the virgin martensite in quenched microstructures of new generation of forging steels with higher silicon content using colour etching

Observation and identification of phase transformations of austenite during isothermal bainitic processing, Q-P heat treatment or quenching and tempering is often quite a tricky task. The reason is that obtained microstructures are typically very fine with insufficient contrast of various structu...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 69