prof. RNDr. Michal Kotoul, DrSc.

E-mail:   kotoul@fme.vutbr.cz 
Dept.:   Institute of Solid Mechanics, Mechatronics and Biomechanics
Position:   Deputy Director
Room:   A2/606
Phone:   +420 54114 2889
Dept.:   Institute of Solid Mechanics, Mechatronics and Biomechanics
Dept. of Fracture Mechanics and Mesomechanics of Materials
Position:   Head of Department
Room:   A2/606
Phone:   +420 54114 2889
Dept.:   Institute of Solid Mechanics, Mechatronics and Biomechanics
Dept. of Fracture Mechanics and Mesomechanics of Materials
Position:   Professor
Room:   A2/606
Phone:   +420 54114 2889
Dept.:   Division of Advanced Metallic Materials
Section of Mechanics
Position:   Other Teaching Position

Education and academic qualification

  • 1980, RNDr, Faculty of Science UJEP Brno, in the field of Physics of solid state
  • 1985, PhD., Institute of Physical Metallurgy, CSAS Brno, in the field of Physical metallurgy and limit states of materials
  • 1993, Doc., Faculty of Mechanical Engineering, BUT, in the field of Applied mechanics
  • 2001, DrSc., BUT, in the field of Mechanics of rigid and deformable bodies and media
  • 2003, Prof., BUT in the field of Applied mechanics

Career overview

  • 1979-1981, study stay at Institute of Physical Metallurgy CSAS Brno
  • 1981-1984, PhD study, Institute of Physical Metallurgy CSAS Brno
  • 1985-1990, senior research worker, Institute of Physical Metallurgy CSAS Brno
  • 1990-1993, assistant professor, Institute of Mechanics of Solids, FME BUT
  • 1993-2003, associate professor, Institute of Mechanics of Solids, FME BUT
  • 2003-to date, professor, Institute of Mechanics of Solids, Mechatronics and Biomechanics FME BUT

Pedagogic activities

  • Start of teaching activities in 1981. Lectures and consultations on 5 subjects of undergraduate as well as postgraduate courses of Solid Mechanics including supervision of diploma projects
  • Introduction of a new course in the Applied Mechanics curriculum and two new courses in the Mathematical Engineering curriculum
  • Regular member of examining boards, reviews of master and doctoral theses
  • Expert of the Ministry of Education in examining boards for doctoral theses
  • Tutor of 8 doctoral theses
  • Author of 1 lecture note

Scientific activities

  • Fracture mechanics. Crack shielding and bridging modeling mainly by distributed dislocation technique and integral equation approach, calculations of fracture-mechanics parameters for cracked bodies, crack propagation in nonhomogeneous materials
  • Damage mechanics and micromechanics of heterogeneous materials and composites.
  • Homogenization of composite materials
  • More than 100 papers both in Czech and international journals, and in the proceedings from the national and international conferences.

University activities

  • since 2003, Deputy Head of Institute of Solid Mechanics, Mechatronics and Biomechanics
  • 2006-31.1.2014  vice-rector for creative activities, science and research

Projects

  • ========PRINCIPAL INVESTIGATOR=====
  • GAČR 101/99/0829 Micromechanics and nonphenomenological constitutive relations of composites with brittle matrix in low cycle compression-compression conditions, 1999-2001.
  • GAČR 101/02/0683, Cracks/microcracks behaviour in selected brittle matrix composites, 2005-2007.
  • GAČR 101/05/0320 Solution of general stress concentrators in anisotropic heterogeneous media via combination of FEM and continuously distributed dislocation technique, 2005-2007.
  • GAČR 106/06/0724 Micro-structurally induced shielding effects in toughening of ceramic matrix composites, 2006-2008.
  • GAČR 101/09/1821 Mechanical and fracture properties of multilayered ceramic/ceramic and ceramic/metal materials with graded layers, 2009-2012.
  • ======COLLABORATOR=======
  • Research project III-4-2/2 Deformation of intensively loaded bodies, 1986-90.
  • GAČR 101/94/1844 Computational modelling of selected technological operations and processes based upon the continuum mechanics, 1994-96.
  • Research project CEZ:J22/98:262100001 Computational and physical modelling of engineering problems of thermofluid mechanics, solid mechanics and phase transofrmations, 1999-2004.

Sum of citations (without self-citations) indexed within SCOPUS

153

Sum of citations (without self-citations) indexed within ISI Web of Knowledge

155

Sum of other citations (without self-citations)

165

Supervised courses:

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
  • 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,
    Theoretical and Applied Fracture Mechanics, Vol.71, (2014), No.2014, pp.67-75, ISSN 0167-8442, PERGAMON-ELSEVIER SCIENCE LTD
    journal article
  • 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
  • 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
  • ŠEVEČEK, O.; BERMEJO, R.; KOTOUL, M.:
    Prediction of the crack bifurcation in layered ceramics with high residual stresses,
    Engineering Fracture Mechanics, Vol.2013, (2013), No.108, pp.120-138, ISSN 0013-7944, Elsevier
    journal article
  • 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,
    Engineering Fracture Mechanics, Vol.80, (2012), No.1, pp.28-51, ISSN 0013-7944
    journal article
  • 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

List of publications at Portal BUT

Abstracts of most important papers:

  • 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,
    Engineering Fracture Mechanics, Vol.80, (2012), No.1, pp.28-51, ISSN 0013-7944
    journal article

    Crack perpendicularly impinging the bimaterial interface and a crack arbitrary inclined to the interface are considered for a wide range of elastically mismatched materials. In the former case, the effect of the T-stress is investigated, in the latter case the combined effect of a weaker singularity and stronger singularity is examined for a range of crack/interface configurations. For the crack arbitrary inclined to the interface, FE solution of near-crack stress–displacement field obtained using a very fine mesh is compared with analytical singular field considering two leading terms of asymptotic expansion. As a side result it is found that the domain of singular field dominance for an arbitrary inclined crack increases with decreasing angle between the crack and the interface.
  • KLUSÁK, J.; PROFANT, T.; ŠEVEČEK, O.; KOTOUL, M.:
    Crack propagation from bi-material notches - matched asymptotic procedure,
    Key Engineering Materials (print), Vol.488-489, (2012), No.2012, pp.416-419, ISSN 1013-9826, Trans Tech Publication
    journal article

    The methods based on the properties of the two-state integrals allow one to calculate the amplitude of singular and the other terms of the Williams asymptotic expansion. The paper is focused on the use of the Y-integral, whose application is conditioned by the knowledge of the socalled auxiliary solution of the solved problem. On the other hand, the Y-integral can be applied to the analysis of the problems with various geometries, e.g. the analysis of the bi-material notches. The application of the Y-integral can be also extended to the matched asymptotic procedure, which allows one to predict the behavior of the cracked notches or following crack growth near the bimaterial interfaces.
  • 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

    Příspěvek se zabývá problamatikou popisu singulárního pole napětí v okolí ostrého ortotropního bimateriálového vrubu. Koncentrace napětí může vést k iniciaci thliny v kořeni vrubu a jejímu následnému růstu. Příspěvek popisuje proceduru, která vede na vyjádření kritických hodnot zobecněných faktorů intenzity napětí a sestavení kritrétií pro potenciální směr šíření a iniciaci trhliny z kořene vrubu.
  • 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

    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.
  • KOTOUL, M.; POKLUDA, J.; ŠANDERA, P.; DLOUHÝ, I.; CHLUP, Z.; BOCCACCINI, A.:
    Toughening effects quantification in glass matrix composite reinforced by alumina platelets,
    Acta materialia, Vol.56, (2008), No.12, pp.2908-2918, ISSN 1359-6454
    journal article

    A borosilicate glass matrix composite containing alumina platelets was considered to investigate toughening mechanisms and crack tip behaviour in dispersion reinforced brittle matrix composites. Fracture toughness was determined applying the chevron notched specimen technique and fractographic analysis was employed to reveal the active toughening mechanisms with increasing content of reinforcement. A roughness-induced shielding effect has been quantified to prove the relation between fracture toughness and fracture surface roughness. Theoretical calculations of the fracture toughness enhancement based on a modified crack deflection model developed by Faber and Evans, combined with the influence of the increase in Young's modulus, were found to be in good agreement with experimental data. An effect of residual stresses upon toughening of the investigated composite is discussed.