Ing. Josef Zapletal, Ph.D.
E-mail:   zapletal@fme.vutbr.cz  Dept.:   Institute of Materials Science and Engineering Dept. of Mechanics and Design of Materials Position:   Assistant Professor Room:   A3/309

Publications:

• ŠEBEK, F.; ZAPLETAL, J.; KUBÍK, P.; PETRUŠKA, J.:
  Flow behaviour in compression test under various lubrication conditions,
  Engineering Mechanics 2019, pp.351-354, ISBN 978-80-87012-71-0, (2019)
  conference paper
  akce: Engineering Mechanics 2019, Svratka, 13.05.2019-16.05.2019
• PEČ, M.; ŠEBEK, F.; ZAPLETAL, J.; PETRUŠKA, J.; HASSAN, T.:
  Automated calibration of advanced cyclic plasticity model parameters with sensitivity analysis for aluminium alloy 2024-T351, SAGE Publications
  journal article in Web of Science
• PEČ, M.; ZAPLETAL, J.; ŠEBEK, F.; PETRUŠKA, J.:
  Low-Cycle Fatigue, Fractography and Life Assessment of EN AW 2024-T351 under Various Loadings
  journal article in Web of Science
• ŠEBEK, F.; PARK, N.; KUBÍK, P.; PETRUŠKA, J.; ZAPLETAL, J.:
  Ductile fracture predictions in small punch testing of cold-rolled aluminium alloy
  journal article in Web of Science
• ZAPLETAL, J.; DOLEŽAL, P.:
  Elastic and Plastic Behavior of the QE22 Magnesium Alloy Reinforced with Short Saffil Fibers and SiC Particles, MDPI AG
  journal article in Web of Science
• MORAVČÍK, I.; ČÍŽEK, J.; ZAPLETAL, J.; KOVACOVA, Z.; VESELY, J.; MINÁRIK, P.; KITZMANTECH, M.; NEUBAUER, E.; DLOUHÝ, I.:
  Microstructure and mechanical properties of Ni1,5Co1,5CrFeTi0,5 high entropy alloy fabricated by mechanical alloying and spark plasma sintering, ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
  journal article in Web of Science
• DOLEŽAL, P.; ZAPLETAL, J.; FINTOVÁ, S.; TROJANOVÁ, Z.; GREGER, M.; ROUPCOVÁ, P.; PODRÁBSKÝ, T.:
  Influence of Processing Techniques on Microstructure and Mechanical Properties of a Biodegradable Mg-3Zn-2Ca Alloy, MDPI
  journal article in Web of Science
• HORYNOVÁ, M.; ZAPLETAL, J.; DOLEŽAL, P.; GEJDOŠ, P.:
  Evaluation of fatigue life of AZ31 magnesium alloy fabricated by squeeze casting,
  Materials and design, Vol.45, (2013), No.3, pp.253-264, ISSN 0261-3069, ELSEVIER
  journal article - other
• ZAPLETAL, J.; VĚCHET, S.; KOHOUT, J.; LIŠKUTÍN, P.:
  FATIGUE LIFETIME OF 7075 ALUMINIUM ALLOY FROM ULTIMATE TENSILE STRENGTH TO PERMANENT FATIGUE LIMIT,
  Communications, Vol.2009, (2009), No.1, pp.17-21, ISSN 1335-4205
  journal article - other
• HANZLÍKOVÁ, K.; VĚCHET, S.; KOHOUT, J.; ZAPLETAL, J.:
  The Optimitation of the Isothermal Transformation Dwell of the ADI Obtained at Transformation Temperature of 380oC,
  Materials Science Forum, Vol.567-568, (2008), No.5, pp.337-340, ISSN 0255-5476, Trans Tech Publications Ltd
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• PEČ, M.; ZAPLETAL, J.; ŠEBEK, F.; PETRUŠKA, J.:
  Low-Cycle Fatigue, Fractography and Life Assessment of EN AW 2024-T351 under Various Loadings
  journal article in Web of Science
  The paper provides extensive experiments on aluminium alloy 2024-T351. Those cover the uniaxial strain- and stress-controlled tests using cylindrical specimens. Then, multiaxial tests were conducted via strain- and stress-controlled tensile–torsional loading on tubular specimens, which also cover the following non-proportional test – the 3-step experiment carried out in order to document the additional hardening. The paper also provides a fractography using the scanning electron microscopy and the life assessment. A novel approach to fatigue life prediction is presented, based on replacing the plastic part of the strain-life curve by the non-linear term in order to provide more variability and approximation ability. The broad experimental base will serve as a basis for future calibration and simulation using advanced cyclic plasticity models within the finite elements.
• ŠEBEK, F.; PARK, N.; KUBÍK, P.; PETRUŠKA, J.; ZAPLETAL, J.:
  Ductile fracture predictions in small punch testing of cold-rolled aluminium alloy
  journal article in Web of Science
  The ductile fracture has been observed in large as well as small scales. Three chosen Lode and pressure dependent phenomenological ductile fracture criteria with cut-offs were calibrated for aluminium alloy EN AW 2024-T351 using an enhanced hybrid experimental–numerical technique. It consisted of calibrating all the material constants of fracture criteria altogether. This enabled ready determination of the cut-off related constant for one of those criteria. Moreover, a non-quadratic Lode dependent plasticity model was coupled with the ductile failure criteria to form the damage plasticity approach in the numerical analysis. The fracture criteria were calibrated using the standard – large – sized specimens including a non-standard upsetting test. The specimens used for the calibration of failure criteria are usually ten times larger than that of a specimen for the small punch test. The transferability of calibrated parameters was tested and fair predictability was observed for all numerical models when applied to small scales.
• ZAPLETAL, J.; DOLEŽAL, P.:
  Elastic and Plastic Behavior of the QE22 Magnesium Alloy Reinforced with Short Saffil Fibers and SiC Particles, MDPI AG
  journal article in Web of Science
  Magnesium alloy QE22 (nominal composition 2 wt % Ag, 2 wt % mixture of rare earth elements, balance Mg) was reinforced with 5 vol % Saffil fibers and 15 vol % SiC particles. The hybrid composite was prepared via the squeeze cast technique. The microstructure of the monolithic alloy and composite was analyzed using scanning electron microscopy. Elastic modulus was measured at room temperature and modeled by the Halpin–Tsai–Kardos mathematical model. The strengthening effect of fibers and particles was calculated and compared with the experimentally obtained values. The main strengthening terms were determined. Fracture surfaces were studied via scanning electron microscope. While the fracture of the matrix alloy had a mainly intercrystalline character, the failure of the hybrid composite was transcrystalline
• MORAVČÍK, I.; ČÍŽEK, J.; ZAPLETAL, J.; KOVACOVA, Z.; VESELY, J.; MINÁRIK, P.; KITZMANTECH, M.; NEUBAUER, E.; DLOUHÝ, I.:
  Microstructure and mechanical properties of Ni1,5Co1,5CrFeTi0,5 high entropy alloy fabricated by mechanical alloying and spark plasma sintering, ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
  journal article in Web of Science
  The present work is focused on synthesis and mechanical properties evaluation of non-equiatomic Ni1,5Co1,5CrFeTi0,5, ductile single phase high entropy alloy (HEA) with excellent mechanical properties (bend strength Rmb = 2593 MPa, tensile strength Rm = 1384 MPa, tensile elongation to fracture of 4.01%, and elastic modulus of 216 GPa) surpassing those of traditional as-cast HEA. For the alloy production, a combination of mechanical alloying (MA) process in a planetary ball mill and spark plasma sintering (SPS) for powder densification was utilized. The tensile properties of a bulk material produced by a combination of MA+SPS are characterized for the first time. The feedstock powder and corresponding bulk material microstructure, elemental and phase composition, and mechanical properties were investigated by scanning (SEM) and transmission (TEM) electron microscopy, energy-dispersive X-ray spectroscopy (EDX), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), aswell as impulse excitation of vibration, Vickers microhardness and tensile and bend strength tests, respectively. The structure of the samples consisted of single-phase FCC high entropy solid solution of extremely fine-twinned grains and oxide inclusions inherited from the original powder feedstock. Dimple-like morphology corresponding to ductile fracture mode has been observed on the fracture surfaces, with crack initiation sites on the inclusions phases.
• DOLEŽAL, P.; ZAPLETAL, J.; FINTOVÁ, S.; TROJANOVÁ, Z.; GREGER, M.; ROUPCOVÁ, P.; PODRÁBSKÝ, T.:
  Influence of Processing Techniques on Microstructure and Mechanical Properties of a Biodegradable Mg-3Zn-2Ca Alloy, MDPI
  journal article in Web of Science
  New Mg-3Zn-2Ca magnesium alloy was prepared using different processing techniques: gravity casting as well as squeeze casting in liquid and semisolid states. Materials were further thermally treated; thermal treatment of the gravity cast alloy was additionally combined with the equal channel angular pressing (ECAP). Alloy processed by the squeeze casting in liquid as well as in semisolid state exhibit improved plasticity; the ECAP processing positively influenced both the tensile and compressive characteristics of the alloy. Applied heat treatment influenced the distribution and chemical composition of present intermetallic phases. Influence of particular processing techniques, heat treatment, and intermetallic phase distribution is thoroughly discussed in relation to mechanical behavior of presented alloys.