Institute of Physics of Materials AS CR, v. v. i. > People > Kruml Tomáš

prof. Mgr. Tomáš Kruml, CSc.

Phone number+420 532 290 379
E-mail[javascript protected email address]
Researcher IDG-1267-2014
Positionhead - Low Cycle Fatigue Group

Personal information
  • 1985-1990 University studies
    Masaryk university Brno, Faculty of Sciences, specialization Physics of solid state
  • 1992-1996 Postgradual studies
    Institute of Physics of Materials AS CR (IPM), Brno, specialization Physical metallurgy and threshold states of materials
  • 1996-1997 Ecole Polytechnique Fédérale, Lausanne/Switzerland
    Post-doc stay at EPFL, Physics dept., Institute of Nuclear Engineering
  • 1998-1999 IPM AS CR
    Researcher in the Low Cycle Fatigue group
  • 2000-2003 EPFL Lausanne
    First assistant at EPFL
  • 2003-2005 Ecole des Mines, Nancy/France
    University professor at Ecole des Mines
  • since 2005 IPM AS CR
    Researcher in the Low Cycle Fatigue group, since 2011 head of the group

  • Scientific interest
    Detailed description of mechanisms of plastic deformation, degradation mechanisms due to cyclic deformation, development of experimental methods for mechanical testing of thin films.
    Materials: high temperature intermetallics (TiAl, Ni3Al, superalloys), progressive steels (ODS, duplex, austenitic), shape memory alloys (NiTi), thin films (Al–Cu, TiN), model materials (Cu, Ge)


    Holzer J., Chlup Z., Kruml T., Gröger R.: Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K. Int. J. Plast. 138 (2021) 102938

    Tinoco Navarro H., Holzer J., Pikálek T., Sobota J., Fořt T., Matějka M., Kruml T., Hutař P.: Determination of the yield stress in Al thin film by applying bulge test. Journal of Physics: Conference Series 1777 (2021) 012030

    Říha Z., Zeleňák M., Kruml T., Poloprudský J.: Comparison of the disintegration abilities of modulated and continuous water jets. Wear 478-479 (2021) 203891

    Tinoco Navarro H., Hutař P., Kruml T., Holzer J.: Modeling of elastoplastic behavior of freestanding square thin films under bulge testing. Acta Mechanica 1 (2021) 02978-7

    Poloprudský J., Chlupová A., Kruml T., Hloch S., Hlaváček P., Foldyna J.: Effect of Standoff Distance on the Erosion of Various Materials. Lecture Notes in Mechanical Engineering Advances (2021) 164-171

    Babinský T., Kuběna I., Šulák I., Kruml T., Tobiáš J., Polák J.: Surface relief evolution and fatigue crack initiation in René 41 superalloy cycled at room temperature. Mater. Sci. Eng. A 819 (2021) 141520


    Tinoco Navarro H., Hutař P., Merle B., Göken M., Kruml T.: Fracture Toughness Evaluation of a Cracked Au Thin Film by Applying a Finite Element Analysis and Bulge Test. Key Eng. Mater. 827 (2020) 196-202

    Chlupová A., Poczklán L., Man J., Mazánová V., Heczko M., Kruml T.: Character of Fatigue Damage under Axial, Torsional and Biaxial Loading of 316L Stainless Steel. Defect Diffus. Forum 405 (2020) 264-270

    Mazánová V., Heczko M., Slone C., Kuběna I., Tobiáš J., George E., Kruml T., Polák J., Mills M.: SEM & STEM Multi-scale Characterization of Fatigue Damage in CrCoNi Medium-entropy Alloy with Fully Recrystallized Microstructure. Microscopy and Microanalysis 26 (Supp (2020) 2224

    Hloch S., Srivastava M., Nag A., Müller M., Hromasová M., Svobodová J., Kruml T., Chlupová A.: Effect of pressure of pulsating water jet moving along stair trajectory on erosion depth, surface morphology and microhardness. Wear 452-453 (2020) 203278

    Chlupová A., Heczko M., Obrtlík K., Dlouhý A., Kruml T.: Effect of heat-treatment on the microstructure and fatigue properties of lamellar gama-TiAl alloyed with Nb, Mo and/or C. Mater. Sci. Eng. A 786 (2020) 139427


    Tinoco Navarro H., Holzer J., Pikálek T., Buchta Z., Lazar J., Chlupová A., Kruml T., Hutař P.: Determination of elastic parameters of Si3N4 thin films by means of a numerical approach and bulge tests. Thin Solid Films 672 (2019) 66-74

    Mazánová V., Heczko M., Škorík V., Chlupová A., Polák J., Kruml T.: Microstructure and martensitic transformation in 316L austenitic steel during multiaxial low cycle fatigue at room temperature. Mater. Sci. Eng. A 767 (2019) 138407

    Husák R., Hadraba H., Chlup Z., Heczko M., Kruml T., Puchý V.: ODS EUROFER Steel Strengthened by Y-(Ce, Hf, La, Sc, and Zr) Complex Oxides. Metals 9 (2019) 1148

    Kuběna M., Eliáš M., Zajíčková L., Poduška J., Kruml T.: On the Tensile Tests of Polyurethane and Its Composites with Carbon Nanotubes. Adv. Mater. Sci. Eng. 2019 (2019) 6598452


    Heczko M., Esser B., Smith T., Beran P., Mazánová V., McComb D., Kruml T., Polák J., Mills M.: Atomic resolution characterization of strengthening nanoparticles in a new high-temperature-capable 43Fe-25Ni-22.5Cr austenitic stainless steel. Mater. Sci. Eng. A 719 (2018) 49-60

    Wärner H., Calmunger M., Chai G., Polák J., Petráš R., Heczko M., Kruml T., Johansson S., Moverare J.: Fracture and Damage Behavior in an Advanced Heat Resistant Austenitic Stainless Steel During LCF, TMF and CF. Procedia Struct. Integr. 13 (2018) 843-848

    Spätig P., Heczko M., Kruml T., Seifert H.: Influence of mean stress and light water reactor environment on fatigue life and dislocation microstructures of 316L austenitic steel. J. Nucl. Mater. 509 (2018) 15-28

    Gröger R., Chlup Z., Kuběna I., Kruml T.: Slip activity in molybdenum single crystals compressed at 77 K. Philos. Mag. 98 (2018) 2749-2768


    Heczko M., Esser B., Smith T., Beran P., Mazánová V., Kruml T., Polák J., Mills M.: On the origin of extraordinary cyclic strengthening of the austenitic stainless steel Sanicro 25 during fatigue at 700 C. J. Mater. Res. 32 (2017) 4342-4353

    Mazánová V., Polák J., Škorík V., Kruml T.: Multiaxial elastoplastic cyclic loading of austenitic 316L steel. Frattura ed Integrita Strutturale 11 (2017) 162-169

    Hutař P., Poduška J., Šmíd M., Kuběna I., Chlupová A., Náhlík L., Polák J., Kruml T.: Short fatigue crack behaviour under low cycle fatigue regime. Int. J. Fatigue 103 (2017) 207-215

    Mazánová V., Škorík V., Kruml T., Polák J.: Cyclic response and early damage evolution in multiaxial cyclic loading of 316L austenitic steel. Int. J. Fatigue 100 (2017) 466-476

    Chlupová A., Heczko M., Obrtlík K., Beran P., Kruml T.: Effect of Alloying and Thermal Processing on Mechanical Properties of TiAl Alloys. Solid State Phenom. 258 (2017) 501-505

    Heczko M., Polák J., Kruml T.: Microstructure and dislocation arrangements in Sanicro 25 steel fatigued at ambient and elevated temperatures. Mater. Sci. Eng. A 680 (2017) 168-181

    Heczko M., Spätig P., Seifert H., Kruml T.: Correlation between Dislocation Structures and Mechanical Fatigue Response of 316L Austenitic Steel Loaded with and without Mean Stress at High Temperature in Air and Water Environment. Solid State Phenom. 258 (2017) 534-537


    Polák J., Petráš R., Heczko M., Kruml T., Chai G.: Evolution of the cyclic plastic response of Sanicro 25 steel cycled at ambient and elevated temperatures. Int. J. Fatigue 83 (2016) 75-83

    Hutař P., Poduška J., Chlupová A., Šmíd M., Kruml T., Náhlík L.: Description of short fatigue crack propagation under low cycle fatigue regime. Procedia Struct. Integr. 2 (2016) 3009-3016

    Chlupová A., Chlup Z., Kruml T.: Fatigue properties and microstructure of quasicrystalline AlFeCrTi alloy. Int. J. Fatigue 91 (2016) 251-256

    Kuběna I., Kruml T., Polák J.: Behaviour of ODS Steels in Cyclic Loading. Trans. Indian Inst. Metals 69 (2016) 309-313

    Weidner A., Kolmorgen R., Kuběna I., Kulawinski D., Kruml T., Biermann H.: Decomposition and Precipitation Process During Thermo-mechanical Fatigue of Duplex Stainless Steel. Metall. Mater. Trans. A 47 (2016) 2112-2124

    Beran P., Heczko M., Kruml T., Panzner T., Petegem S.: Complex investigation of deformation twinning in gama-TiAl byTEM and neutron diffraction. J. Mech. Phys. Solids 95 (2016) 647-662

    Chlupová A., Heczko M., Obrtlík K., Polák J., Roupcová P., Beran P., Kruml T.: Mechanical properties of high niobium TiAl alloys doped with Mo and C. Mater. & Design 99 (2016) 284-292


    Kuběna I., Polák J., Plocinski T., Hébert C., Škorík V., Kruml T.: Microstructural stability of ODS steels in cyclic loading. Fatigue Fract. Eng. Mater. Struct. 38 (2015) 936-947

    Guth S., Petráš R., Škorík V., Kruml T., Man J., Lang K., Polák J.: Influence of dwell times on the thermomechanical fatigue behavior of a directionally solidified Ni-base superalloy. Int. J. Fatigue 80 (2015) 426-433


    Beran P., Petrenec M., Heczko M., Smetana B., Žaludová M., Šmíd M., Kruml T., Keller L.: In-situ neutron diffraction study of thermal phase stability in a gamma-TiAl based alloy doped with Mo and/or C. Intermetallics 54 (2014) 28-38

    Polák J., Petráš R., Heczko M., Kuběna I., Kruml T., Chai G.: Low cycle fatigue behavior of Sanicro 25 steel at room and at elevated temperature. Mater. Sci. Eng. A 615 (2014) 175-182

    Hutař P., Kuběna I., Ševčík M., Šmíd M., Kruml T., Náhlík L.: Small fatigue crack propagation in Y2O3 strengthened steels. J. Nucl. Mater. 452 (2014) 370-377

    Hutař P., Kuběna I., Šmíd M., Ševčík M., Kruml T., Náhlík L.: Description of small fatigue crack propagation in ODS steel. Adv. Mater. Res. 891-892 (2014) 911-916

    Kuběna I., Polák J., Marmy P., Kruml T.: A comparison of microstructure evolution due to fatigue loading in Eurofer 97 and ODS Eurofer steels. Procedia Eng. 74 (2014) 401-404

    Chlupová A., Obrtlík K., Beran P., Heczko M., Polák J., Kruml T.: Monotonic and cyclic properties of TiAl alloys doped with Nb, Mo and C. Procedia Eng. 74 (2014) 405-408

    Kruml T., Obrtlík K.: Microstructure degradation in high temperature fatigue of TiAl alloy. Int. J. Fatigue 65 (2014) 28-32

    Polák J., Petráš R., Heczko M., Kruml T., Chai G.: Analysis of Cyclic Plastic Response of Heat Resistant Sanicro 25 Steel at Ambient and Elevated Temperatures. Procedia Eng. 74 (2014) 68-73

    Kruml T., Chlupová A., Obrtlík K.: Cyclic deformation of a modern TiAl alloy at high temperatures. Adv. Mater. Res. 891-892 (2014) 1131-1136


    Saada G., Kruml T.: Removal of plastic instabilities by reversal of the applied stress. Philos. Mag. 93 (2013) 256-271

    Polák J., Obrtlík K., Petrenec M., Man J., Kruml T.: Mechanisms of high temperature damage in elastoplastic cyclic loading of nickel superalloys and TiAl intermetallics. Procedia Eng. 55 (2013) 114-122

    Kruml T., Martin J.: Dislocation densities and internal stress in Ni3Al. Philos. Mag. 93 (2013) 50-59

    Kuběna I., Kruml T.: Fatigue life and microstructure of ODS steels. Eng. Fract. Mech. 103 (2013) 39-47


    Kuběna I., Fournier B., Kruml T.: Effect of microstructure on low cycle fatigue properties of ODS steels. J. Nucl. Mater. 424 (2012) 101-108

    Giordana M., Giroux P., Alvarez-Armas I., Sauzay M., Armas A., Kruml T.: Microstructure evolution during cyclic tests on EUROFER 97 at room temperature. TEM observation and modelling. Mater. Sci. Eng. A 550 (2012) 103-11

    Fournier B., Steckmeyer A., Rouffie A., Malaplate J., Garnier J., Ratti M., Wident P., Ziolek L., Tournie I., Rabeau V., Gentzbittel J., Kruml T., Kuběna I.: Mechanical behaviour of ferritic ODS steels - Temperature dependancy and anisotropy. J. Nucl. Mater. 430 (2012) 142-149

    Man J., Vystavěl T., Weidner A., Kuběna I., Petrenec M., Kruml T., Polák J.: Study of cyclic strain localization and fatigue crack initiation using FIB technique. Int. J. Fatigue 39 (2012) 44-53


    Man J., Obrtlík K., Petrenec M., Beran P., Smaga M., Weidner A., Dluhoš J., Kruml T., Biermann H., Eifler D., Polák J.: Stability of austenitic 316L stainless steel against martensite formation during cyclic straining. Procedia Eng. 10 (2011) 1279-1284

    Kruml T., Kuběna I., Polák J.: Fatigue behaviour and surface relief in ODS steels. Procedia Eng. 10 (2011) 1690-1695

    Hutař P., Náhlík L., Ševčík M., Seitl S., Kruml T., Polák J.: Fatigue crack propagation rate in EUROFER 97 estimated using small specimens. Key Eng. Mater. 452-453 (2011) 325-328

    Polák J., Petrenec M., Man J., Kruml T.: Cyclic plasticity and cyclic creep in austenitic-ferritic duplex steel. Key Eng. Mater. 465 (2011) 431-434

    Polák J., Petrenec M., Kruml T., Chlupová A.: Cyclic plastic response and fatigue life in symmetric and asymmetric cyclic loading. Procedia Eng. 10 (2011) 568-577

    Couteau O., Kruml T., Martin J.: About the activation volume for cross-slip in Cu at high stresses. Acta Mater. 59 (2011) 4207-4215

    Kruml T., Polák J.: Fatigue cracks in Eurofer 97 steel: Part I. Nucleation and small crack growth kinetics. J. Nucl. Mater. 412 (2011) 2-6

    Saada G., Kruml T.: Deformation mechanisms of nanograined metallic polycrystals. Acta Mater. 59 (2011) 2565-2574

    Kruml T., Hutař P., Náhlík L., Seitl S., Polák J.: Fatigue cracks in Eurofer 97 steel: Part II. Comparison of small and long fatigue crack growth. J. Nucl. Mater. 412 (2011) 7-12


    Polák J., Man J., Obrtlík K., Kruml T.: The shape of extrusions and intrusions produced by cyclic straining. Z. Metallkd. 94 (2003) 1327-1330

    Number of ProjectName
    CK02000025 Advanced welded structurus for enhanced operational safety in aviation
    958192, H2020-NMBP-ST-IND-2020-singlestage, LC-SPIRE-08-2020 Tailoring ODS materials processing routes for additive manufacturing of high temperature devices for aggressive environments (topAM)
    19-00408S Material integrity and structure at the early stages during pulsating liquid jet interaction
    18-03615S Description of short fatigue crack growth in large scale yielding conditions
    15-08826S Damage mechanisms in multiaxial cyclic loading
    P107/11/0704 Optimization of structure and properties of advanced high-temperature cast materials alloyed with carbon by complex heat treatment
    106/09/1954 Role of oxide dispersion in fatigue behaviour of ODS type steels