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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 75
Rubešová, Kateřina , Peković, Michal , Jirková, Hana , Hradil, David
Resistance of tool steel processed by unconventional forming technology against abrasive wear

Materials for parts which are subjected to abrasive wear in service are typically selected on the basis of the microstructure type and hardness. Additional characteristics, such as grain size and the size and morphology of carbides are considered less frequently, although they may ...

Jeníček, Štěpán , Peković, Michal , Opatová, Kateřina , Vorel, Ivan
Relationship between Mechanical Properties in 42SiCr and 42SiMn Medium-carbon Steels and Austempering Temperatures

Sheet metal forming boundaries are established using the forming limit diagram (FLD). The Nakajima and Marciniak tests, which are based on stretching a material using a punch, are the most commonly used methods for determining the FLD or fracture forming limit diagram (FFLD). The&#...

Rubešová, Kateřina , Rund, Martin , Rzepa, Sylwia , Jirková, Hana , Jeníček, Štěpán , Urbánek, Miroslav , Kučerová, Ludmila , Konopík, Pavel
Determining Forming Limit Diagrams Using Sub-Sized Specimen Geometry and Comparing FLD Evaluation Methods

In this paper, the problem of Hermite interpolation by clamped Minkowski Pythagorean hodograph (MPH) B-spline curves is considered. Using the properties of B-splines, our intention is to use the MPH curves of degrees lower than in algorithms designed before. Special attention is devoted...

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

In conventional steels, bainitic microstructure which forms under isothermal conditions consists of bainitic ferrite and carbide precipitates whose distribution and size substantially depend on the parameters of isothermal treatment. In CFB steels (Carbide Free Bainite) however, the main microstructural&#x...

Kovanda, Jan , Malkovský, Zdeněk , Rulc, Vojtěch
Možnosti zajištění aktivní bezpečnosti u kolejových vozidel městské hromadné dopravy

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&#...

Khalaj, Omid , Ghobadi, Moslem , Zarezadeh, Alireza , Saebnoori, Ehsan , Jirková, Hana , Chocholatý, Ondřej , Svoboda, Jiří
Potential role of machine learning techniques for modeling the hardness of OPH steels

This paper examines the influence of Johannes Crato and the seminal treatises on medicine and botany written by leading Central European scholars during the early modern period on the erudition and genesis of poetic work of the Elizabethan poet Philip Sidney. Johannes Crato (1519-1...

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 ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 75