A5052860422- Erosion and Abrasive Machining
- Surface Treatment and Residual Stress
- Particle Dynamics in Fluid Flows
- High-Temperature Coating Behaviors
- Fluid Dynamics and Heat Transfer
- Advanced Surface Polishing Techniques
- High-Velocity Impact and Material Behavior
- Tunneling and Rock Mechanics
- Materials Engineering and Processing
- Drilling and Well Engineering
- Coal Combustion and Slurry Processing
- Fire effects on concrete materials
- Metal and Thin Film Mechanics
- Tribology and Lubrication Engineering
- Advanced machining processes and optimization
- Surface Roughness and Optical Measurements
- Advanced materials and composites
- Fire dynamics and safety research
- Engineering and Environmental Studies
- Diamond and Carbon-based Materials Research
- Engineering Technology and Methodologies
- Rock Mechanics and Modeling
- Material Properties and Applications
- Wind and Air Flow Studies
- Engineering and Material Science Research
Czech Academy of Sciences, Institute of Geonics
2012-2021
Nihon University
2020
Technical University of Košice
2019
VSB - Technical University of Ostrava
2017
Brno University of Technology
2013
The paper is dealing with the effects of flat high-speed water jet on concretes affected by high temperature. Research should help to correct use technology in repair works concrete structures especially after wildfires tunnels, underground garages, etc., which are exposed enormous thermal stress. Four mixtures were prepared for tests interaction concrete. samples 200 °C and 600 comparison one third left unaffected. It was found, that both lower traversing velocity (cutting speed) higher...
Erosion effects of a pulsating water jet impinging the surface aluminium alloy samples pre-treated by various techniques (rough and fine milling, planing rolling) were studied.The influence initial topography on final sample exposed to was investigated.Based roughness parameter Ra erosion layers analysed discussed in relation traversing speed jet.It found that pre-treatment have significant impact affected subsequently jet.Surfaces, whose properties are significantly action some machining...
Presented article is focused on surface integrity evaluation of brass CW614N form the sight topography, structural changes in layers and strengthening character subsurface after impact acoustically excited pulsating water jet (PWJ). Surface topography was evaluated using optical profilometry. Structural layer were observed based mass material removal Δm [mg/s] maximal depth penetrance PWJ hmax [mm]. Nano indentation measurement according to Berkovich used examination layer. Disintegration...
Pulsating water jet technology for rock erosion application has been emphasized in this study. The phenomena are explored as an eroded depth, width and volume of the sandstone at frequency f = 20,000–40,000 Hz by using pulsed jet. surface was pressure 20–40 MPa; standoff distance 20 mm; nozzle diameter 1.6 feed rate 125–200 mm/s. width, sections were evaluated through non-contact-type optical profilometer. result shows relationship between jet, pressure, distance, which affects depth...
This paper presents first results of the study resistance carbon nanotube concrete composite (CNT/concrete composite) to action continuous and pulsating water jets.The experiments oriented at determination erosion effects jets impinging surface reference (concrete) CNT/concrete samples were performed.Tested characterized by X-ray powder diffraction scanning electron microscope.Samples exposed various operating parameters.Erosion evaluated in terms material removal rate.The possible influence...
The paper investigates the effect of material machinability on quality cutting surfaces created by abrasive waterjet in selected aluminium alloys. texture studied was measured an optical profilometer and consequently assessed using standardized amplitude parameters profile roughness Ra, Rz Rq. It found that a surface is significantly influenced not only speed determined particular alloy but also its strength properties.
The paper deals with the topic of determination erosion effects a pulsating water jet impinging surface aluminium alloy samples treated by various techniques (rough and fine milling, planing rolling).The influence initial topography on final sample exposed to was investigated.Erosion layers analysed discussed in relation traversing velocity jet.It found that properties have significant impact topography.Degree determined measurement parameter Ra.