prof. RNDr. Pavel Šandera, CSc.
E-mail:   sandera@fme.vutbr.cz  WWW:   http://ufo.fme.vutbr.cz Dept.:   Institute of Physical Engineering Dept. of Micromechanics of Materials and Engineering Acoustics Position:   Head of Department Room:   A2/505 Dept.:   Institute of Physical Engineering Dept. of Micromechanics of Materials and Engineering Acoustics Position:   Professor Room:   A2/505

Supervised courses:

• Physical Principles of Deformation of Solids (DS104A)
• Physical Principles of Deformation of Solids (DS104A)
• Analytical Mechanics and Mechanics of Continuum (9AMK)
• Physical principles of deformation of solids (DS104)
• Physical principles of deformation of solids (DS104)
• Physics II (3F)
• Physics II (3F-A)

Publications:

• LEJČEK, P.; ŠANDERA, P.; HORNÍKOVÁ, J.; ŘEHÁK, P.; POKLUDA, J.:
  Grain Boundary Segregation of Elements of Groups 14 and 15 and its Consequences for Intergranular Cohesion of Ferritic Iron
  journal article in Web of Science
• PÍŠKA, M.; TRUBAČOVÁ, P.; HORNÍKOVÁ, J.; ŠANDERA, P.; BOIVIE, K.:
  A Study of Selective Laser Melting Technology on the Ultra-High Strength Tool Steel Use—Quality, Mechanical Properties and Fatigue,
  Applied Mechanics, Behavior of Materials, and Engineering Systems, pp.67-86, ISBN 978-3-319-41467-6, (2016), Springer International Publishing
  book chapter
• LEJČEK, P.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J.; GODEC, M.:
  On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron, Elsevier
  journal article in Web of Science
• VOJTEK, T.; POKLUDA, J.; ŠANDERA, P.; HORNÍKOVÁ, J.; HOHENWARTER, A.; PIPPAN, R.:
  Analysis of fatigue crack propagation under mixed mode II + III in ARMCO iron, Elsevier
  journal article in Web of Science
• VOJTEK, T.; POKLUDA, J.; HORNÍKOVÁ, J.; ŠANDERA, P.; SLÁMEČKA, K.:
  Description of Fatigue Crack Growth under Modes II, III and II+III in Terms of J-integral, Elsevier
  journal article in Web of Science
• HORNÍKOVÁ, J.; ŽÁK, S.; ŠANDERA, P.:
  K-calibration of Special Specimens for Mode II, III and II+III Crack Growth, Elsevier
  journal article in Web of Science
• LEJČEK, P.; POKLUDA, J.; ŠANDERA, P.; HORNÍKOVÁ, J.; JENKO, M.:
  Solute Segregation at 46.8deg(111) Twist Grain Boundary of a Phosphorus Doped Fe-2.3%V Alloy
  journal article in Web of Science
• POKLUDA, J.; SLÁMEČKA, K.; ŠANDERA, P.:
  Mechanism of Factory-Roof Formation,
  Engineering Fracture Mechanics, Vol.77, (2010), No.1, pp.1763-1771, ISSN 0013-7944
  journal article - other
• POKLUDA, J.; ŠANDERA, P.:
  Micromechanisms of Fracture and Fatigue: In a Multiscale Context,
  ISBN 978-1-84996-265-0, (2010), Springer
  book
• KOTOUL, M.; POKLUDA, J.; ŠANDERA, P.; DLOUHÝ, I.; CHLUP, Z.; BOCCACCINI, A.:
  Toughening effects quantification in glass matrix composite reinforced by alumina platelets
  journal article in Web of Science
• HORNÍKOVÁ, J.; ŠANDERA, P.; ČERNÝ, M.; POKLUDA, J.:
  Multiscale modelling of nanoindentation test in Cu crystal,
  Engineering Fracture Mechanics, Vol.76, (2007), No.1, ISSN 0013-7944
  journal article - other
• POKLUDA, J. ŠANDERA, P. HORNÍKOVÁ, J.:
  Statistical Approach to Roughness-Induced Shielding Effects,
  Fatigue & Fracture of Engineering Materials & Structures, Vol.27, (2004), No.2, pp.141-157, ISSN 8756-758X, 'Neuveden'
  journal article - other
• ČERNÝ, M.; ŠOB, M.; POKLUDA, J.; ŠANDERA, P.:
  Ab initio calculations of ideal tensile strength and mechanical stability in copper,
  Journal of Physics: Condensed Matter, Vol.16, (2004), No.2, pp.1045-1052, ISSN 0953-8984
  journal article - other
• ČERNÝ, M.; POKLUDA, J.; ŠOB, M.; FRIÁK, M.; ŠANDERA, P.:
  Ab initio calculations of elastic and magnetic properties of Fe, Co, Ni, and Cr crystals under isotropic deformation, AMERICAN PHYSICAL SOC
  journal article in Web of Science
• ŠANDERA, P., POKLUDA, J.:
  Ideal Strength of Cubic Crystals under Triaxial Tension,
  Metallic Materials, Vol.32, (1994), No.4, pp.282-291
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• LEJČEK, P.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J.; GODEC, M.:
  On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron, Elsevier
  journal article in Web of Science
  The study of the temperature dependence of tin and antimony segregation at grain boundaries of binary Fe–Sb and Fe–Sn polycrystalline alloys using Auger Electron Spectroscopy suggests that during the brittle intergranular fracture mainly the general grain boundaries are opened in the samples annealed at low temperatures which are more segregated than the special ones. On the contrary, the special grain boundaries are opened in the samples annealed at higher temperatures because – as a consequence of the enthalpy-entropy compensation effect – they are more enriched by the solute. The limiting temperature between these two states is the so-called compensation temperature. Therefore, the temperature dependence of the grain boundary segregation measured in polycrystals should be described by two sets of the thermodynamic parameters (i.e. segregation enthalpy and entropy): one of them correlating the segregation under the compensation temperature, the other one for the segregation at higher temperatures.
• HORNÍKOVÁ, J.; ŽÁK, S.; ŠANDERA, P.:
  K-calibration of Special Specimens for Mode II, III and II+III Crack Growth, Elsevier
  journal article in Web of Science
  An original testing setup has been designed for generating pure remote mode II, III and mixed mode II + III crack propagation in a single cylindrical specimen with circumferential crack. This specimen is currently used for investigations of a shear mode fatigue crack propagation. The aim of this work was to perform the K-calibration of above mentioned specimens that will be used for a description of stability and growth of shear-mode fatigue cracks in the near-threshold region. Two-step submodelling based on the ANSYS code was performed in order to obtain sufficiently precise values of the stress intensity factors KII, KIII and KII,III along the crack front of small and large samples. The shape functions FII, FIII and FII,III were determined using the J-integral concept. The calculated values of the KIII factors could be, unlike those of KII factors, nearly compared with the solution based on an asymptotic approximation available in the literature. Calculations revealed that, for small gripping distances, the shape functions FII and FIII depend on the experimental adjustment of the gripping distance.
• POKLUDA, J.; ŠANDERA, P.:
  Micromechanisms of Fracture and Fatigue: In a Multiscale Context,
  ISBN 978-1-84996-265-0, (2010), Springer
  book
  First chapter deals with calculaton of theoretical strenght of crystala and their applications to nanocomposite properties and nanoindentation testing. Second chapter describes micro-degradation processes of brittle and ductile fracture of materials. Third chapter is devoted to dislocation mechanisms of iniiiation and propagation of fatigue cracks under loading modes I, II, III and the mixed mode. This chapter presents applications to a determinations of inherent threshold values, evaluation of materiáls fracture with surface coating and for failure analysis.
• POKLUDA, J. ŠANDERA, P. HORNÍKOVÁ, J.:
  Statistical Approach to Roughness-Induced Shielding Effects,
  Fatigue & Fracture of Engineering Materials & Structures, Vol.27, (2004), No.2, pp.141-157, ISSN 8756-758X, 'Neuveden'
  journal article - other
  A new theoretical concept is introduced to describe the roughness-induced shielding effects in metallic materials. This approach is based on the statistics of the local ratio between the characteristic microstuctural distance and the plastic zone size. A general equation involving both the crack branching and the crack closure phenomena is derived in the frame of linear elastic fracture mechanics under the assumption of remote mode I loading. It enablesthe determination of the intrinsic valuesof both the fracture toughness and the fatigue crack growth threshold. Moreover, the roughness-induced component can be separated from other closure components, such as the plasticity or oxide-induced closure. In order to estimate the total roughness-induced shileding effect only standard materials data such as the yield stress, the mean grain size, the surface roughness and the fracture mode are necessary. Examples of applications concerning static fracture and fatigue are presented for selected metallic materials.
• POKLUDA, J., ČERNÝ, M., ŠANDERA, P., ŠOB, M.:
  Calculations of Theoretical Strength: State of the Art and History.,
  Journal of Computer-Aided Materials Design, Vol.11, (2004), No.1, pp.1-28, ISSN 0928-1045
  journal article - other
  Current state and historical evolution of theoretical strength calculations is presented as a brief overview completed by a database of selected theoretical and experimental results. Principles of a sophisticated analysis of mechanical stability of crystals are elucidated by means of a schematic example. Stability conditions and Jacobian matrixes are presented for selected crystalline symmetries and deformation paths. The importance of this analysis for understanding micromechanics of fracture is shown on the background of the influence of crystal defects. Differences between theoretical and experimental TS values are discussed and some challenging tasks are outlined for the near future.