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Prof. Dr. rer. nat. Khanh Chau Le

  • former scientific co-worker
  • Chair of Mechanics and Theory of Materials
  • Institute of Computational Engineering
  • Faculty of Civil and Environmental
    Engineering
  • Room IA 3/137
  • Phone +49 (0)234 /32-26033
  • Fax +49 (0)234 /32-06033
  • E-Mail: chau.le@rub.de

TEACHING

  • Mechanics of materials (I, II)
  • Linear vibrations
  • Non-linear vibrations
  • Continuum Mechanics (Master Course)
  • Solid Mechanics (VGU Master Course)
  • Plasticity (VGU Master Course)

RESEARCH

  • Variational methods of continuum mechanics.
  • Dynamics of thin-walled structures: theory and numerical simulation.
  • Crack nucleation, growth, and propagation in brittle materials.
  • Dislocation based crystal plasticity and size effect.
  • Micromechanics of crystal defects
  • Evolution of microstructure: recrystallization, polygonization and so on.

RESEARCH projectS

  • German Science Foundation (DFG), "Elasto-plasticity at large elastic and large plastic strains with application to simulation of elasto-plastic structures'', DFG Project ST 135/1-1.
  • Ruhr University Bochum, "Nonlinear fracture mechanics“.
  • Ruhr University Bochum, "Finite elastoplasticity without and with microstructure“.
  • German Science Foundation (DFG), "General thermodynamical model of continua with defects and its application to durability analysis of engineering structures“, SFB 398, Project A7.
  • German Science Foundation (DFG), “Multiscale modelling of damage processes”, SFB 398, Project B8.
  • German Science Foundation (DFG), “Fragmentation analysis of rocks under seismic loading conditions”, SFB 526, Project D9 (Project leader).

PublicationS

MONOGRAPHY

1. Vibrations of Shells and Rods. Springer, Berlin, 1999.

2. Introduction to Micromechanics. Nova Science, New York, 2010.

BOOK chapteR

1. Variational problems of crack equilibrium and crack propagation, in: Multiscale Modelling in Continuum Mechanics and Structured Deformations (eds. G. del Piero and D. Owen), pp.52-81, CISM-course, Springer (2004)

2. Continuum dislocation theory and related size effect in crystal plasticity, in: Advances in Condensed Matter and Materials Research (eds. H. Geelvinck and S. Reynst), Nova Science (2010) (with Kochmann, D.)

PUBLICATIOnS in referEeD JOURNALS

  1. On the static-geometric analogy, Mechanical Bulletin of Moscow University, Math.-Mech., N1, 70-76 (1979)
  2. High frequency, long wave shell vibration, J. Appl. Math. Mech. (PMM) 44, 520-525 (1980) (with Berdichevsky, V.L.)
  3. High frequency, long wave vibration of piezoelectric ceramic plates, Soviet Physics Doklady 27, 422-423 (1982)
  4. High frequency vibration of shells, Soviet Physics Doklady 27, 988-990 (1982) (with Berdichevsky, V.L.)
  5. Fundamental relations of the theory of anisotropic piezoelectric shells, Mechanical Bulletin of Moscow University, Math.-Mech., N5, 57-60 (1984)
  6. On the edge resonance of the semi-infinite elastic plate, Mechanical Bulletin of Moscow University, Math.-Mech., N5, 57-60 (1985)
  7. High frequency vibrations of piezoelectric ceramic shells, Soviet Physics Doklady 30, 899-900 (1985)
  8. The theory of piezoelectric shells, J. Appl. Math. Mech. (PMM) 50, 98-105 (1986)
  9. High frequency longitudinal vibrations of elastic rods, J. Appl. Math. Mech. (PMM) 50, 335-341 (1986)
  10. On the impact of piezoceramic rods, Mechanics of Solids 3, 312-316 (1987)
  11. On the nonlinear theory of brittle fracture, Soviet Physics Doklady 34, 321-323 (1989)
  12. Variational principle of nonlinear brittle fracture mechanics, J. Appl. Math. Mech. (PMM) 54, 658-665 (1990)
  13. Variational estimates of the effective thermal conductivities of transversely isotropic composites, J. Engng Physics 59, 562-568 (1990) (with Pham, D.C.)
  14. Variational principles of nonlinear fracture mechanics, Acta Mechanica 83, 25-37 (1990) (with Stumpf, H.)
  15. On the elastoplastic crack problem at finite strain, ZAAM 71, N4, 317-319 (1990) (with Stumpf, H.)
  16. On bounding the effective conductivity of isotropic composite materials, ZAMP 42, 614-622 (1991) (with Pham, D.C.)
  17. On shakedown of elastoplastic shells, Quarterly of Appl. Math. 49, N4, 781-793 (1991) (with Stumpf, H.)
  18. On the singular elastostatic field induced by a crack in a Hadamard material, Quarterly J. Mech. Appl. Math. 45, N1, 101-117 (1992)
  19. Variational formulation of crack problem for an elastoplastic body at finite strain, ZAAM 72, N9, 387-396 (1992) (with Stumpf, H.)
  20. Adaptation of elastoplastic membrane shells, ZAMM 73, N4, 357-359 (1993) (with Stumpf, H.)
  21. A new look at finite strain elastoplasticity from the thermodynamic viewpoint, ZAMM 73, N4, 302-304 (1993) (with Stumpf, H.)
  22. The singular elastostatic field due to a crack in rubberlike materials, J. Elasticity 32, N2, 183-222 (1993) (with Stumpf, H.)
  23. Constitutive equations for elastoplastic bodies at finite strain: thermodynamic implementation, Acta Mechanica 100, 155-170 (1993) (with Stumpf, H.)
  24. On the cohesive crack model, ZAMM 75, Suppl. 1, 231-232 (1995) (with Stumpf, H.)
  25. On the determination of the crystal reference in nonlinear continuum theory of dislocations, Proc. Roy. Soc. London A452, 359-371 (1996) (with Stumpf, H.)
  26. Nonlinear continuum theory of dislocations, Int. J. Engng Sci. 34, 339-358 (1996) (with Stumpf, H.)
  27. A model of elastoplastic bodies with continuously distributed dislocations, Int. J. Plasticity 12, 611-627 (1996) (with Stumpf, H.)
  28. High frequency vibrations and wave propagation in elastic shells: variational-asymptotic approach, Int. J. Solids Structures 34, 3923-3939 (1997)
  29. Strain measures, integrability condition and frame indifference in the theory of oriented media, Int. J. Solids Structures 35, 783-798 (1998) (with Stumpf, H.)
  30. Dissipative driving force in ductile crystals and the strain localization phenomenon, Int. J. Plasticity 14, 1109-1131 (1998) (with Schütte, H. and Stumpf, H.)
  31. Determination of the driving force acting on the kinked crack, Archive of Applied Mechanics 69, 337-344 (1999) (with Schütte, H. and Stumpf, H.)
  32. Energy distribution in a neutral gas of point vortices, Journal of Statistical Physics 104, N3-4, 883-894 (2001) (with Berdichevsky, V.L.)
  33. Theory of charge nucleation in two dimensions, Phys. Review E 66, 026129 (2002) (with Berdichevsky, V.L.)
  34. Estimation of crack density due to fragmentation of brittle ellipsoidal inclusions embedded in a ductile matrix, Archive of Applied Mechanics 74, 439-448 (2005) (with Korobeinik, M. and Hackl, K.)
  35. Microcrack nucleation in brittle solids, Int. J. Fracture 133, 47-54 (2005) (with Berdichevsky, V.L.)
  36. On kinetics of hysteresis, Continuum Mechanics and Thermodynamics, 18, 335-342 (2006)
  37. A unified theory of channel and pipe flows, WSEAS Trans.Fluid Mech., 1, 785-792 (2006)
  38. Dislocation nucleation and work hardening in anti-plane constrained shear, Continuum Mechanics and Thermodynamics, 18, 455-467 (2007) (with Berdichevsky, V.L.)
  39. Turbulent flows in channels and pipes, Vietnam Journal of Mechanics, 29, 385-396 (2007)
  40. Periodic debonding of an adhesive film, Comptes Rendus Mecanique, 336, 170-175 (2007) (with Truskinovsky, L.)
  41. Plane constrained shear of single crystals within continuum dislocation theory, Arch. Appl. Mech., 78, 587-597 (2008) (with Sembiring, P.)
  42. Plane constrained shear of single crystal strip with two active slip systems, J. Mech. Phys. Solids, 56, 2541-2554 (2008) (with Sembiring, P.)
  43. Dislocation pile-ups in bicrystals within continuum dislocation theory, Int. J. Plasticity, 24, 2125-2147 (2008) (with Kochmann, D.)
  44. A simple model for dynamic recrystallization during severe plastic deformation, Arch. Appl. Mech. 79, 579-586 (2009) (with Kochmann, D.)
  45. A continuum model for initiation and evolution of deformation twinning, J. Mech. Phys. Solids 57, 987-1002 (2009) (with Kochmann, D.)
  46. Plane constrained uniaxial extension of a single crystal strip, Int. J. Plasticity 25, 1950-1969 (2009) (with Sembiring, P.)
  47. Plastic deformation of bicrystals within continuum dislocation theory, Math. Mech. Solids 14, 540-563 (2009) (with Kochmann, D.)
  48. An inequality for a quadratic functional, Vietnam Journal of Mechanics 31, 155-158 (2009)
  49. Plastic yielding and work hardening of single crystal in a soft device, Comptes Rendus Mecanique 337, 709-715 (2009) (with Nguyen, Q.S.)
  50. Polygonization as low energy dislocation structure, Continuum Mechanics and Thermodynamics 22, 291-298 (2010) (with Nguyen, Q.S.)
  51. On torsion of a single crystal rod, Int. J. Plasticity, DOI: 10.1016/j.ijplas.2010.07.003 (with Kaluza, M.)
  52. On sensitivity of plastic yielding and work hardening to the boundary conditions, J. Mech. Phys. Solids (submitted) (with Sembiring, P.)

InstitutE rePORTS, CONFERENCE PROCEEDInGS

  1. High frequency vibration of shells, Doctor dissertation, 128 pp., Moscow State University (1983)
  2. Dispersion of piezoceramic plates, in: Proceedings of the 1st International Conference on Mechanics, MGU, 1986
  3. High frequency vibration of shells and rods, Habilitation, 325 pp., St-Petersburg State University (1986)
  4. On bounding the effective conductivity of isotropic composite materials, in: Composite, Ceramic, Polymer, Thermoplastic, 177-182 IITT, Paris (1989) (with Pham, D.C.)
  5. Variational inequalities in brittle fracture mechanics, in: Brittle Matrix Composites 2, 144-151, Elsevier, London (1989)
  6. Equilibrium Criterion for a Nonlinear Elastic Slitted body, in: Advances in Fracture, 1, 49-53, Pergamon Press, New York-Oxford (1989)
  7. Variational principles of fracture mechanics, Mitteilungen Institut für Mechanik, 64, 1-65, Ruhr-Universität Bochum (1989) (with Stumpf, H. and Weichert, D.)
  8. Nonlinear crack problem: classification of singularities for rubberlike materials, in: 18th International Congress of Theoretical and Applied Mechanics, Haifa, Israel, 1992, 141 (1992) (with Stumpf, H.)
  9. On thermodynamics of elastoplastic continua at finite strain, in: Modelling of Plastic Deformation and its Engineering Applications, Riso, Denmark, September 1992, 317-321, Riso National Laboratory, Roskilde (1992) (with Stumpf, H.)
  10. On a general concept for finite elastoplasticity based on a nonlinear continuum theory of dislocations, in: Proc. 4th Int. Symposium on Plasticity and its current Applications, Baltimore, 1993 (with Stumpf, H.)
  11. Elastoplasticity with microstructure, Mitteilungen Institut für Mechanik 94, 1-77, Ruhr-Universität Bochum (1994) (with Stumpf, H.)
  12. Continuum theory of dislocations based on the resolution F=FeFp, in: Proc. 8th Int. Symposium on Continuum Models and Discrete Systems, Varna, Bulgaria, 1995 (ed. K.Z. Markov), pp. 538-545, World Scientific, Singapore, 1996. (with Stumpf, H.)
  13. Kontinuumsmechanisches Modellieren von Medien mit veränderlicher Mikrostruktur, Mitteilungen Institut für Mechanik 106, 1-194, Ruhr-Universität Bochum (1996)
  14. Strain localization in single crystals: thermodynamic consideration, in: Recent advances in solids/structures, 1997 ASME International Mechanical Engineering Congress, Dallas, U.S.A (ed. Y.W. Kwon, D.C. Davis, H.H. Chung, L. Librescu), pp. 81-91, The American Society of Mechanical Engineers, New York (1997)
  15. On a microconcept of crystal plasticity, in: Physics and mechanics of finite plastic and viscoplastic deformation (ed. A.S. Khan), pp. 279-280, Neat Press, Maryland (1997) (with Stumpf, H.)
  16. Thermodynamically based constitutive equations for single crystals, in: Geometry, Continua & Microstructure, Paris, France, 1997 (ed. G.A. Maugin) pp. 87--97, Hermann, Paris, (1999)
  17. Variational formulation of the crack problem with a virtual crack kinking, in: Proc. 9th Int. Symposium on Continuum Models and Discrete Systems, Istanbul, Turkey, 1998 (eds. E. Inan and K.Z. Markov), pp. 727-735, World Scientific, Singapore, 1998 (with Schütte, H.)
  18. High-frequency vibrations of shells and rods, in: Proc. 4th International Colloquium on Computation of Shells & Spatial Structures, Chania, Greece, 2000, (eds. M.Papadrakakis, A. Samartin and E. Onate), IASS-IACM (2000)
  19. The singular field in nonlinear dynamic anti-plane shear crack problem, in: Proc. 4th European Solid Mechanics Conference, Metz, France, 2000
  20. Driving force acting on a running crack, in GAMM-2001 Proceeding
  21. Interaction energy of point vortices, in Proc. 4th Int. Conference on Nonlinear Mechanics, Shanghai, China,2002, (ed. W.Z. Chien) (2002)
  22. Microcrack nucleation in brittle solids, in Oberwolfach Reports, pp. 3001-3002, 55 (2004)
  23. Estimation of crack density due to fragmentation of brittle ellipsoidal inhomogeneities embedded in a ductile matrix, in PAMM 2005, Luxembourg,2005, (ed. M. Slather), pp. 339-340, 5 (2005) (with Korobeinik, M. and Hackl, K.)
  24. On the kinetics of the pseudoelastic hysteresis loop, in Oberwolfach Reports, pp. 227-228, 4 (2006)
  25. A variational principle of channel and pipe flows, in Proc. of the WSEAS Conference on Applied and Theoretical Mechanics, pp. 76-81 (2006)
  26. Dislocation pile-up in plane constrained shear, in Proc. of International Conference on composites/nano engineering ICCE-15, Haikou, Hainan Island, China, 2007, pp. 498-499 (2007) (with Sembiring, P.)
  27. Collective nature of debonding, in Subduction dynamics – bridging the scales, Symposium, Sprockhövel, Germany, 2007, (ed. W. Friederich), pp. 142-143 (2007) (with L. Truskinovsky)
  28. A simple model for dynamic recrystallization during severe plastic deformation, in Subduction dynamics – bridging the scales, Symposium, Sprockhövel, Germany, 2007, (ed. W. Friederich), pp. 138-139 (2007) (with Kochmann, D.)
  29. Plane strain constrained shear of a single crystal strip, in Recent Advances in Mechanics, 6th German-Greek-Polish Symposium, Alexandroupolis, Greece, 2007, (ed. J.T. Katsikadelis), pp. 41-42 (2007) (with P. Sembiring)
  30. Plastic deformation of bicrystals within continuum dislocation theory, in Proc. Appl. Math. Mech., pp. 1-2 (2007) (with D. Kochmann)
  31. Plane constrained shear of single crystal strip with one and two active slip systems, in Proc. Appl. Math. Mech., pp. 1-2 (2007) (with P. Sembiring)
  32. Continuum dislocation theory and size effect, in Proc. XXII ICTAM, Adelaide, Australia, 2008, paper 11484 (2008)
  33. An energetic approach to deformation twinning, in IUTAM Symposium on Variational Concepts with Applications to the Mechanics of Materials (ed. K. Hackl), pp. 141-155, Springer, Berlin (2010) (with Kochmann, D.)

SHORT CV

1962-1966
Primary school in Hanoi
1966-1974
Secondary and high schools
1974-1979
Moscow State University Faculty of Mechanics and Mathematics. Final examination on 20 July 1979 Master of Science (Mechanics)
1979-1983
Moscow State University Faculty of Mechanics and Mathematics. Ph.D. thesis: "High frequency vibrations of shells", Supervisors: Prof. Dr. L.I. Sedov and Dr. V.L. Berdichevsky. Doctor degree awarded on 17.12.1982
1983-1986
Moscow State University Faculty of Mechanics and Mathematics. First habilitation (Doctor of Science). Thesis: "High frequency vibrations of shells and rods". Habilitation awarded on 19 September 1986
1996
Ruhr University Bochum Faculty of Civil Engineering. Second habilitation.
Thesis: "Continuum modelling of media with changeable microstructure“
Venia legendi awarded on 27 November 1996

PROfESsIONAL EXPERIENCES

  • Research assistant
    Chair of Hydrodynamics,
    Moscow State University. 1.03.1983 - 30.03.1986
  • Group leader
    Research group in composite materials,
    Institute of mechanics in Hanoi. 15.06.1986 - 30.08.1988
  • Humboldt fellow
    Chair of General Mechanics
    Ruhr University Bochum. 01.09.1988 - 30.05.1989
  • Assistant professor
    Chair of General Mechanics
    Ruhr University Bochum. 01.06.1989 - 31.03.1993
  • Associate professor
    Chair of General Mechanics
    Ruhr University Bochum. 01.04.1993 – 2003
  • Lectureship
    Faculty of mechanical engineering
    University Paderborn. WS 2000 – WS 2001
  • Professor
    Chair of Mechanics and Theory of Materials
    Ruhr University Bochum 11.2003 – today
  • Professor
    Institute of Mechanics
    Hanoi (Vietnam). 4.2004 –today
  • Scientific Adviser
    Institute of Applied Mechanics
    Ho Chi Minh City (Vietnam) 4.2004 –today

MISCELLANEOUS

MEMBER OF SCIENTIFIC SOCIETIES

  • VSME (Vietnamese Society of Mechanical Engineers).
  • GAMM (Gesellschaft für Angewandte Mathematik und Mechanik).
  • AMS (American Mathematical Society).
  • ASME (American Society of Mechanical Engineers)

AWARDS

  • First prize for young scientist of the Moscow State University, 1979
  • Dr. Sci. (Habil), St-Petersburg University, Faculty of Mathematics and Mechancsk, 1986
  • Alexander von Humboldt Fellowship, Germany, 1989
  • Dr. Habil., Ruhr University Bochum, Faculty of Civil Engineering, 1996
  • Three times "Research in Pairs“ at Mathematical Institute in Oberwolfach
  • Invited Lecturer, CISM (International Center for Mechanical Sciences), Udine, Italy (2003)
  • Regular Research stay at the Wayne State University since 2002
  • Visiting Professor, Ecole Polytechnique, Palaiseau, France, 2006, 2009.
  • Outstanding Scientist of the 21st century
  • Who is Who in the World, 1998, 15th edition, 2001, 18th edition, 2009, 26th edition, 2010, 27th edition
  • Who is Who in Science and Engineering, 2005-2006, 8th edition, 2006-2007, 9th edition, 2007-2008, 10th edition

REVIEWER ACTIVITY

  • Reviewer for
    • International Journal of Fracture
    • Journal of Mechanics and Physics of Solids
    • International Journal of Solids and Structures
    • Applied Mechanics
    • Journal of Elasticity
    • International Journal of Plasticity
    • Mechanics and Applied Mathematics
    • ZAMM
    • Archive of Applied Mechanics
    • Continuum Mechanics and Thermodynamics
    • Mathematics and Mechanics of Solids
    • International Journal for Numerical Methods in Engineering
    • Applicable Analysis
    • Mathematical Review
  • Member of editorial board of two international journals: "International Journal of Mechanics" and "Vietnam Journal of Mechanics"
  • Reviewer of several doctoral theses
  • Supervisor of 15 Master students and 6 Ph.D. students.