prof. Ing. Ivo Dlouhý, CSc.
E-mail:   dlouhy@fme.vutbr.cz  Dept.:   Institute of Materials Science and Engineering Position:   Deputy Director for Scientific Activities Room:   A3/413 Dept.:   Institute of Materials Science and Engineering Dept. of Mechanics and Design of Materials Position:   Professor Room:   A3/413

Supervised courses:

• Aircraft Materials and Technology (OLR)
• Aircraft Materials and Technology (OLR-A)
• Applied Fracture Mechanics (9ALM)
• Deformation and Failure of Materials (RDF)
• Degradation Processes and Service Life Prediction (9DPP)
• Engineering Materials (ZKM)
• Limit States of Materials and Structures (6MS)
• Limit States of Materials and Structures (6MS-A)
• Materials Testing and Evaluation (WZ1)
• Materials Testing and Evaluation (WZ1-A)
• Surface Engineering (WPI)
• Testing of Mechanical Properties (9ZMV)
• Theory of Phase Transformations (9WTF)

Publications:

• ČÍŽEK, J.; DLOUHÝ, I.; ŠIŠKA, F.; KHOR, K.:
  Modification of Plasma Sprayed TiO2 Coatings Characteristics via Controlling the In-flight Temperature and Velocity of the Powder Particles, Springer
  journal article in Web of Science
• CHLUP, Z.; HADRABA, H.; SLABÁKOVÁ, L.; DRDLÍK, D.; DLOUHÝ, I.:
  Fracture behaviour of alumina and zirconia thin layered laminate,
  Journal of the European Ceramic Society, Vol.32, (2012), No.9, pp.2057-2061, ISSN 0955-2219
  journal article - other
• HADRABA, H.; DRDLÍK, D.; CHLUP, Z.; MACA, K.; DLOUHÝ, I.; CIHLÁŘ, J.:
  Laminated alumina/zirconia ceramic composites prepared by electrophoretic deposition,
  Journal of the European Ceramic Society, Vol.32, (2012), No.9, pp.2053-2056, ISSN 0955-2219
  journal article - other
• STRATIL, L.; HADRABA, H.; BURŠÍK, J.; DLOUHÝ, I.:
  Comparison of microstructural properties and Charpy impact behaviour between different plates of the Eurofer97 steel and effect of isothermal ageing,
  JOURNAL OF NUCLEAR MATERIALS, Vol.416, (2011), No.3, pp.311-317, ISSN 0022-3115
  journal article - other
• JURČI, P.; DLOUHÝ, I.:
  Coating of Cr–V ledeburitic steel with CrN containing a small addition of Ag,
  Applied Surface Science, Vol.257, (2011), No.24, pp.10581-10589, ISSN 0169-4332
  journal article - other
• DLOUHÝ, I.; BOCCACCINI, A.; KOCH, D.; LEE, W.; HORVATH, J.; DESIMONE, D.:
  Optically-transparent oxide fibre-reinforced glasss matrix composites,
  Journal of Non-Crystaline Solids, Vol.356, (2010), No.6, pp.2591-2597, ISSN 0022-3093
  journal article - other
• CHLUP, Z.; FLAŠAR, P.; DLOUHÝ, I.:
  Response of inherently brittle materials on higher loading rates,
  Engineering Fracture Mechanics, Vol.77, (2010), No.2, pp.359-366, ISSN 0013-7944
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• ČÍŽEK, J.; DLOUHÝ, I.; ŠIŠKA, F.; KHOR, K.:
  Modification of Plasma Sprayed TiO2 Coatings Characteristics via Controlling the In-flight Temperature and Velocity of the Powder Particles, Springer
  journal article in Web of Science
  The study presents a comprehensive research on the plasma spray fabrication of TiO2 coatings with microstructural properties adjustable via controlling the respective in-flight properties of the feedstock particles. The in-flight properties can be, in return, governed by tuning the plasma system spray parameters. By linking the two determined approaches, a connection between the important coating characteristics (composition, microstructure, surface and mechanical properties) to the plasma system settings was established. It was shown that by changing the values of six parameters representing the flexibility of the plasma system, the temperatures and velocities of the particles within the jet can be altered from 2125-2830 K and 137-201 m/s, respectively. The values of the in-flight temperature critically influenced the efficiency of the coating build-up (values ranging from 8-84 um per 1 torch pass) and the content of anatase phase in the fabricated coatings (0-5.8%), while the in-flight velocity of the TiO2 particles was found to be connected to the porosity of the coatings (ranging from 14.4-26.2%) and the adhesion strength at the coating-substrate interface (2.6x difference).
• CHLUP, Z.; HADRABA, H.; DRDLÍK, D.; MACA, K.; DLOUHÝ, I.; BERMEJO, R.:
  On the determination of the stress-free temperature for alumina-zirconia multilayer structures
  journal article in Web of Science
  Internal residual stresses can enhance the fracture resistance and mechanical reliability of layered ceramics. The magnitude of the stresses depends on the elastic and thermal properties of the layers and the typically assumed reference (stress-free) temperature, below which internal stresses develop. A novel combined experimental and numerical simulation approach has been developed to determine the reference temperature and experimentally proved in alumina–zirconia ceramic laminates. Dilatometric data of monolithic phases are in put for the numerical simulation and experimental data on the laminate properties are used for the stress-free temperature determination. In contrast to typical assumptions, reference temperature very near the sintering temperature (i.e.approx. Tref=1470C) was found, which should be considered for the estimation of internal (residual) stresses in alumina/zirconia-based layered ceramics.
• DLOUHÝ, I.; BOCCACCINI, A.; KOCH, D.; LEE, W.; HORVATH, J.; DESIMONE, D.:
  Optically-transparent oxide fibre-reinforced glasss matrix composites,
  Journal of Non-Crystaline Solids, Vol.356, (2010), No.6, pp.2591-2597, ISSN 0022-3093
  journal article - other
  The development of optomechanical composites, based on glass matrices reinforced with continuous oxide fibre bundles (Nextel) or filaments (sapphire) is described. Small decreases in light transmittance (up to approximately 20%) upon introduction of fibres indicated that the composites are promising materials for use in optomechanical applications, where high transparency or translucency is required, in addition to improved fracture resistance.
• CHLUP, Z.; FLAŠAR, P.; DLOUHÝ, I.:
  Response of inherently brittle materials on higher loading rates,
  Engineering Fracture Mechanics, Vol.77, (2010), No.2, pp.359-366, ISSN 0013-7944
  journal article - other
  Generally, there are components loaded in a wide spectrum of loading rates, however most of design work is based on the data obtained using quasi-statical and uniaxial loading con- ditions. In the case of inherently brittle materials the situation is all the more complicated because of their brittleness. Cast basalt and soda-lime glass were the main experimental materials used in this investigation as representatives of natural based and structural brit- tle materials. The main aim of the paper is to investigate influence of strain rate on fracture resistance and to analyze response of the microstructure to high strain rate loading includ- ing the change of mechanical properties.
• DLOUHÝ, I.; KOTOUL, M.; VYSLOUŽIL, T.; CHLUP, Z.; BOCCACCINI, A.:
  Crack resistance curve in glass matrix composite reinforced by long Nicalon fibres,
  Journal of Materials Science, Vol.43, (2008), No.4, pp.4022-4030, ISSN 0022-2461
  journal article - other
  Theoretical micromechanical analysis of bridged crack development at chevron-notch tip of three-point bend specimens has been applied to determine the crack resistance curve for a composite made of a glass matrix reinforced by continuous Nicalon fibtres. Fracture toughness (KIC) values were determined using the chevron-notch technique at room temperature. The theoretical predictions were based on micromechanical analysis exploiting weight functions.