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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 62
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...

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...

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...

Bureš, Martin , Zetek, Miroslav
Application of laser surface polishing on additive manufactured parts of Inconel 718 nickel-based superalloy

This article deals with the influence of laser polishing parameters on the final surface quality of nickel-based superalloy Inconel 718 produced by metal additive manufacturing. The aim is to optimize the laser polishing process parameters to reduce the surface roughness of the sample.&...

Kučerová, Ludmila , Hájek, Jiří , Vítek, Jan
The Effect of Cryogenic Treatment on Mechanical Properties, Wear and Corrosion Resistance of Aluminium Alloy AW7075

Effect of addition of cryogenic treatment to a standard heat treatment of aluminium alloy AW 7075 was tested in this work. Used heat treatment consisted of solution annealing at 470 °C for two hours and precipitation aging treatment at 130°C for 14 hours, 120 °C for ...

Valíček, Jan , Harničárová, Marta , Řehoř, Jan , Kušnerová, Milena , Gombár, Miroslav , Drbúl, Mário , Šajgalík, Michal , Filipenský, Jan , Fulemová, Jaroslava , Vagaská, Alena
Prediction of Cutting Parameters of HVOF-Sprayed Stellite 6

In this research, the authors set out to propose a new method of predicting and adjusting the main cutting parameters of chip machining, namely spraying on the substrate. In the experiments, a total of 28 turning cuts on a Stellite 6 coating layer were realized. The ...

Bícová, Kateřina , Kubátová, Dana
Contribution to the evaluate the suitability of the measuring equipment

This paper deals with the issue of verifying the suitability of measuring equipment, as meters used in production must meet the required degree of accuracy. However, there are several approaches to measuring and evaluating measuring systems. This paper focuses on measuring the suitabili...

Khalaj, Omid , Azizian, Mehran , Darabi, Naser Joz , Tafreshi, Seyed Naser Moghaddas , Jirková, Hana
The Role of Expanded Polystyrene and Geocell in Enhancing the Behavior of Buried HDPE Pipes under Trench Loading Using Numerical Analyses

In recent years, much research has focused on the use of various materials for relieving and strengthening soil, e.g. steel reinforcing ribs, geosynthetics, geocells, waste tires and expanded polystyrene (EPS). EPS is being used more and more in geo-infrastructures, being a super-light ...

Vychytil, Jan , Špirk, Stanislav
Numerical analysis of passenger kinematics and injury risks during a railway vehicle collision: The effect of safety belts

The aim of this paper is to contribute to investigation of passive safety of passengers in railway vehicles using numerical simulations. At first, a typical interior of a railway vehicle is created in the Virtual Performance Solution software. It includes finite element models of&#...

Kučerová, Ludmila , Zetková, Ivana , Jeníček, Štěpán , Burdová, Karolína
Hybrid parts produced by deposition of 18Ni300 maraging steel viaselective laser melting on forged and heat treated advanced high strength steel

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 62