doc. Ing. Tomáš Profant, Ph.D.
E-mail:   profant@fme.vutbr.cz  Dept.:   Institute of Solid Mechanics, Mechatronics and Biomechanics Dept. of Mechanics of Advanced Materials Position:   Associate Professor Room:   A2/704

Publications:

• ŠEVEČEK, O.; LEGUILLON, D.; PROFANT, T.; KOTOUL, M.:
  Validity of the Finite Fracture Mechanics based Asymptotic Analysis for Predictions of Crack Deflection in Thin Layers of Ceramic Laminates,
  Advances in Fracture and Damage Mechanics XIII, pp.237-240, ISBN 978-3-03835-235-8, (2015), Trans Tech Publications
  conference paper
  akce: 13th International Conference on Fracture and Damage Mechanics, Ponta Delgada, Azores, 23.09.2014-25.09.2014
• ŠEVEČEK, O.; BERMEJO, R.; PROFANT, T.; KOTOUL, M.:
  Influence of the T-stress on the crack bifurcation phenomenon in ceramic laminates,
  20th European Conference on Fracture (ECF 2014), pp.1062-1067, ISBN 9781632669094, (2014), Elsevier
  conference paper
  akce: 13th International Conference on Fracture, Beijing, 16.06.2013-21.06.2013
• KLUSÁK, J.; HRSTKA, M.; PROFANT, T.; KREPL, O.; ŠEVEČEK, O.; KOTOUL, M.:
  The influence of the first non-singular stress terms on crack initiation direction in an orthotropic bi-material plate, PERGAMON-ELSEVIER SCIENCE LTD
  journal article in Web of Science
• PROFANT, T.; KLUSÁK, J.; ŠEVEČEK, O.; HRSTKA, M.; KOTOUL, M.:
  An energetic criterion for a micro-crack of finite length initiated in orthotropic bi-material notches,
  Engineering Fracture Mechanics, Vol.110, (2013), No.2013, pp.396-409, ISSN 0013-7944, PERGAMON-ELSEVIER SCIENCE LTD
  journal article - other
• KLUSÁK, J.; PROFANT, T.; KNÉSL, Z.; KOTOUL, M.:
  The influence of discontinuity and orthotropy of fracture toughness on conditions of fracture initiation in singular stress concentrators,
  Engineering Fracture Mechanics, Vol.110, (2013), No.2013, pp.438-447, ISSN 0013-7944, PERGAMON-ELSEVIER SCIENCE LTD
  journal article - other
• ŠEVEČEK, O.; KOTOUL, M.; PROFANT, T.:
  Effect of higher order asymptotic terms on the competition between crack penetration and debond at a bimaterial interface between aligned orthotropic materials
  journal article in Web of Science
• KLUSÁK, J.; PROFANT, T.; KOTOUL, M.:
  Conditions for crack initiation in an orthotropic bi-material notch, Taylor & Francis Group
  journal article in Web of Science
• KLUSÁK, J.; PROFANT, T.; KOTOUL, M.:
  Determination of the threshold values of orthotropic bi-material notches,
  Procedia Engineering, Vol.2, (2010), No.1, pp.1635-1642, ISSN 1877-7058, Elsevier Ltd.
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• PROFANT, T.; KLUSÁK, J.; ŠEVEČEK, O.; HRSTKA, M.; KOTOUL, M.:
  An energetic criterion for a micro-crack of finite length initiated in orthotropic bi-material notches,
  Engineering Fracture Mechanics, Vol.110, (2013), No.2013, pp.396-409, ISSN 0013-7944, PERGAMON-ELSEVIER SCIENCE LTD
  journal article - other
  The singular stress field at the tip of a bi-material orthotropic notch may cause the initiation of micro-cracks into one of its material part. Assuming the plane elasticity of the anisotropic media, the Lekhnitskii–Eshelby–Stroh formalism is used to express the characteristics of the singular stress field at the notch tip, the auxiliary solution necessary for the calculation of the contour-independent integrals and consequently generalized stress intensity factors. The matched asymptotic expansion analysis is used to evaluate the fracture energy release rate which allows one to assess the potential direction of a crack and establish the fracture criterion based on the theory of the finite fracture mechanics.
• KOTOUL, M.; ŠEVEČEK, O.; PROFANT, T.:
  Analysis of multiple cracks in thin coating on orthotropic substrate under mechanical and residual stresses,
  Engineering Fracture Mechanics, Vol.77, (2009), No.2, pp.229-248, ISSN 0013-7944
  journal article - other
  The analysis addresses a typical failure development pattern in thin films consisting of a system of multiple surface cracks leading to and branching along or near the interface between the film and the base material. The process is driven by thermal residual stresses and/or mechanical loading.
• PROFANT, T.; ŠEVEČEK, O.; KOTOUL, M.; VYSLOUŽIL, T.:
  Dislocation tri-material solution in the analysis of bridged crack in anisotropic bimaterial half-space,
  INTERNATIONAL JOURNAL OF FRACTURE, Vol.147, (2007), No.4, pp.199-217, ISSN 0376-9429
  journal article - other
  The problem of an edge-bridged crack terminating perpendicular to a bimaterial interface in a half- space is analyzed for a general case of elastic anisotropic bimaterials and specialized for the case of orthotropic bimaterials. The edge crack lies in the surface layer of thickness h bonded to semi-infinite substrate. It is assumed that long fibres bridge the crack. Bridging model follows from the assumption of "large" slip lengths adjacent to the crack faces and neglect of initial stresses. The crack is modelled by means of continuous distribution of dislocations, which is assumed to be singular at the crack tip. With respect to the bridged crack problems in finite dissimilar bodies, the reciprocal theorem ( - integral) is demonstrated as to compute, in the present context, the generalized stress intensity factor through the remote stress and displacement field for a particular specimen geometry and boundary conditions using FEM. Also the application of the configurational force mechanics is discussed within the context of the investigated problem.
• PROFANT, T.; ŠEVEČEK, O.; KOTOUL, M.:
  Calculation of k-factor and t-stress for cracks in anisotropic bimaterials,
  Engineering Fracture Mechanics, Vol.75, (2007), No.11, pp.3707-3726, ISSN 0013-7944
  journal article - other
  The problem of a crack in a thin layer terminating perpendicular to a layer/substrate interface is analyzed for a general case of elastic anisotropy. The crack is modelled by means of continuous distribution of dislocations, which is assumed to be singular at the crack tip. A system of simultaneous functional equations is obtained that enables to find the singularity exponent . The reciprocal theorem is used to compute the generalized stress intensity factor (GSIF) through the remote stress and displacement field for a particular specimen geometry and boundary conditions using FEM. The results obtained are compared with the evaluation of GSIF based upon the dislocation arrays technique. Existing semi-analytical solution for singularities in anisotropic trimaterials is applied and its validity for the specimen investigated is checked by FEM. The evaluation of T-stress using the dislocation arrays technique is performed.
• T.PROFANT, M.KOTOUL:
  On collinear microcrack-inclusion arrays interaction and related problems,
  Theoretical and Applied Fracture Mechanics, Vol.44, (2005), No.11, pp.297-328, ISSN 0167-8442
  journal article - other
  Investigated is a crack problem for an array of collinear microcracks in composite matrix. Inclusions are situated in between the neighbouring microcracks tips and exhibit different elastic properties than matrix. The problem is solved using the technique of distributed dislocations. A developed approximate solution for a single dislocation lying in a general point between inclusions is employed in the distribution of continuously distributed dislocation to cracks modelling . Stress intensity factor is calculated for various cracks/inclusions geometries and elastic moduli mismatches. Stability and/or instability of the straight microcrack paths is investigated for slowly growing microcracks with inclusions located in between the neighbouring microcracks tips. Applications to periodic microcrack tunnelling and microcracks weakening ahead of the main crack are discussed.