Education
Research
Publications
Laboratories
Information
dr.ir. L.E. Govaert (Leon)
  Eindhoven University of Technology
Mechanical Engineering
Materials Technology
PO Box 513 ,GEM-Z 4.143
5600 MB Eindhoven, The Netherlands

Tel: +31 40 247 2838
Fax:+31 40 244 7355

Email:

Biography

Leon E. Govaert is associate professor (UHD) in polymer mechanics. He studied Mechanical Engineering at the Eindhoven University of Technology and received his Ph.D. degree from the same university in 1990, with Prof. Dr. P.J. Lemstra and Prof. Dr. Ir. M.J.W. Schouten as his advisors. Next he joined the Polymer Technology group of Prof. Han Meijer at the Department of Mechanical Engineering, Eindhoven University of Technology.

His main fields of experience and expertise are:

  • Structure-property relationships in solid polymer systems . Interrelations between macroscopic mechanical properties and the molecular and micro-structural characteristics of the material.
  • Application and development of experimental techniques for mechanical characterisation of polymers.
  • Constitutive modelling of solid polymers , with an emphasis on time- and rate-dependent behaviour.

Application areas include:

  • Durability: Long-term performance of polymers and polymer composites
  • Toughness: Short-term performance of polymer systems
  • Plastic localisation phenomena
  • Physical ageing and rejuvenation effects in glassy polymers
  • Scaling effects

Education

4A580Polymers: structure and properties Responsible lecturer
4K610Polymer mechanics Responsible lecturer
4M040Design in polymers Contributing lecturer
6BM33introduction to polymer physics Contributing lecturer

Refereed journal publications

2012

L.C.A. van Breemen, L.E. Govaert, H.E.H. Meijer, Scratching polycarbonate, a quantitative model, Wear, 274, 238– 247, (2012)

2011

L.C.A. van Breemen, E.T.J. Klompen, L.E. Govaert, H.E.H. Meijer, Extending the EGP constitutive model for polymer glasses to multiple relaxation times, J. Mech. Phys. Solids, 59(10), 2191-2207, (2011)

T.A.P. Engels, L.C.A. van Breemen, L.E. Govaert, H.E.H. Meijer, Criteria to predict the embrittlement of polycarbonate, Polymer, 52, 1811-1819, (2011)

H.A. Visser, T.C. Bor, M. Wolters, L.L. Warnet, L.E. Govaert, Influence of physical ageing on the impact embrittlement of uPVC pipes, Plastics, Rubber and Composites, 40(5), 201-212, (2011)

A. Sedighiamiri, L.E. Govaert, J.A.W. van Dommelen, Micromechanical Modeling of the Deformation Kinetics of Semicrystalline Polymers, J. Polym. Sci., Part B: Polym. Phys., 49(18), 1297-1310, (2011)

2010

H.A. Visser, T.C. Bor, M. Wolters, T.A.P. Engels, L.E. Govaert, Lifetime assessment of load-bearing polymer glasses; An analytical framework for ductile failure, Macromol. Mater. Eng., 295(7), 637-651, (2010)

H.A. Visser, T.C. Bor, M. Wolters, J.G.F. Wismans, L.E. Govaert, Lifetime assessment of load-bearing polymer glasses; The influence of physical ageing, Macromol. Mater. Eng., 295(12), 1066–1081, (2010)

A. Sedighiamiri, T.B. van Erp, G.W.M. Peters, L.E. Govaert, J.A.W. van Dommelen, Micromechanical Modeling of the Elastic Properties of Semicrystalline Polymers: a Three-Phase Approach, J. Polym. Sci., Part B: Polym. Phys., 48(20), 2173-2184, (2010)

D.J.A. Senden, J.A.W. van Dommelen, L.E. Govaert, Strain Hardening and its Relation to Bauschinger Effects in Oriented Polymers, J. Polym. Sci., Part B: Polym. Phys., 48(13), 1483-1494, (2010)

T.H. Smit, T.A.P. Engels, S.H.M. Söntjens, L.E. Govaert, Time-Dependent Failure in Load-Bearing Polymers: A Potential Hazard in Structural Applications of Polylactides, J. Mater. Sci. - Mater. M., 21, 871-878, (2010)

T.A.P. Engels, S.H.M. Söntjens, T.H. Smit, L.E. Govaert, Time-dependent failure of amorphous polylactides in static loading conditions, J. Mater. Sci. - Mater. M., 21(1), 89-97, (2010)

J.G.F. Wismans, J.A.W. van Dommelen, L.E. Govaert, H.E.H. Meijer, X-ray computed tomography based modelling of polymer foams, Materials Science Forum, 638-6, 2761-2765, (2010)

J.G.F. Wismans, L.E. Govaert, J.A.W. van Dommelen, X-ray computed tomography-based modeling of polymeric foams: the effect of finite element model size on the large strain, J. Polym. Sci., Part B: Polym. Phys., 48(13), 1526-1534, (2010)

2009

R.J. Kroeze, M.N. Helder, L.E. Govaert, T.H. Smit, Biodegradable polymers in bone tissue engineering, Materials, 2, 833-855, (2009)

J.G.F. Wismans, J.A.W. van Dommelen, L.E. Govaert, B. van Rietbergen, H.E.H. Meijer, Computed tomography-based modeling of structured polymers, J. Cell. Plast., 45(2), 157-179, (2009)

T.A.P. Engels, B.A.G. Schrauwen, L.E. Govaert, H.E.H. Meijer, Improvement of the long-term performance of impact-modified polycarbonate by selected heat treatments, Macromol. Mater. Eng., 294(2), 114-121, (2009)

L.C.A. van Breemen, T.A.P. Engels, C.G.N. Pelletier, L.E. Govaert, J.M.J. den Toonder, Numerical simulation of flat-tip micro-indentation of glassy polymers: influence of loading speed and thermodynamic state, Phil. Mag., 89(8), 677 – 696, (2009)

T.A.P. Engels, L.C.A. van Breemen, L.E. Govaert, H.E.H. Meijer, Predicting the long-term mechanical performance of polycarbonate from thermal history during injection molding, Macromol. Mater. Eng., 294(12), 829-838, (2009)

T.A.P. Engels, B.A.G. Schrauwen, L.C.A. van Breemen, L.E. Govaert, Predicting the yield stress of polymer glasses directly from processing conditions: application to miscible systems, International Polymer Processing, 24(2), 167-173, (2009)

T.B. van Erp, C.T. Reynolds, T. Peijs, J.A.W. van Dommelen, L.E. Govaert, Prediction of yield and long-term failure of oriented polypropylene: kinetics and anisotropy, J. Polym. Sci., Part B: Polym. Phys., 47(20), 2026-2035, (2009)

J.L. Wietor, A. Dimopoulos, L.E. Govaert, R.A.T.M. van Benthem, G. de With, R.P. Sijbesma, Preemptive Healing through Supramolecular Cross-Links, Macromolecules, 42(17), 6640–6646, (2009)

T.A.P. Engels, L.E. Govaert, H.E.H. Meijer, The influence of molecular orientation on the yield and post-yield response of injection-molded polycarbonate, Macromol. Mater. Eng., 294(12), 821-828, (2009)

2008

R.P.M. Janssen, L.E. Govaert, H.E.H. Meijer, An analytical method to predict fatigue life of thermoplastics in uniaxial loading: sensitivity to wave type, frequency and stress amplitude, Macromolecules, 41, 2531-2540, (2008)

L.E. Govaert, T.A.P. Engels, M. Wendlandt, T.A. Tervoort, U.W. Suter, Does the strain hardening modulus of glassy polymers scale with the flow stress?, J. Polym. Sci., Part B: Polym. Phys., 46(22), 2475-2481, (2008)

R.P.M. Janssen, D. de Kanter, L.E. Govaert, H.E.H. Meijer, Fatigue Life Predictions for Glassy Polymers: A Constitutive Approach, Macromolecules, 41, 2520-2530, (2008)

J.T.A. Kierkels, C..L. Dona, T.A. Tervoort, L.E. Govaert, Kinetics of re-embrittlement of (anti-) plasticized glassy polymers after mechanical rejuvenation, J. Polym. Sci., Part B: Polym. Phys., 46(2), 134-147, (2008)

C.G.N. Pelletier, J.M.J. den Toonder, L.E. Govaert, N. Hakiri, M. Sakai, Quantitative assessment and prediction of the contact area development during spherical tip indentation of glassy polymers., Phil. Mag., 88, 1291-1306, (2008)

S.H.M. Söntjens, R.A.E. Renken, G.M.L. van Gemert, T.A.P. Engels, A.W. Bosman, H.M. Janssen, L.E. Govaert, F.P.T. Baaijens, Thermoplastic Elastomers based on Strong and Well-Defined Hydrogen-Bonding Interactions, Macromolecules, 41(15), 5703-5708, (2008)

T.H. Smit, T.A.P. Engels, P.I. Wuisman, L.E. Govaert, Time-dependent mechanical strength of 70/30 poly(L,DL-lactide): shedding light on the premature failure of degradable spinal cages, Spine, 33(1), 14-18, (2008)

2007

C.G.N. Pelletier, E.C.A. Dekkers, L.E. Govaert, J.M.J. den Toonder, H.E.H. Meijer, The influence of indenter-surface misalignment on the results of instrumented indentation tests, Polym. Test., 26(7), 949-959, (2007)

J.A.W. van Dommelen, W.A.M. Brekelmans, L.E. Govaert, Multiscale modelling of the mechanical behaviour of oriented semicrystalline polymers, Materials Science Forum, 539-5, 2607-2612, (2007)

B. Alcock, N.O. Cabrera, N..M. Barkoula, C.T. Reynolds, L.E. Govaert, T. Peijs, The effect of temperature and strain rate on the mechanical properties of highly oriented polypropylene tapes and all-polypropylene composites, Composite Science & Technology, 67(10), 2061-2070, (2007)

2006

L.E. Govaert, H.E.H. Meijer, DYFP2006, the 13th int. conference on deformation, yield and fracture of polymers, Applied Rheology, 16(5), 290-291, (2006)

T.A.P. Engels, L.E. Govaert, G.W.M. Peters, H.E.H. Meijer, Processing induced properties in glassy polymers: application of structural relaxation to yield stress development, J. Polym. Sci., Part B: Polym. Phys., 44(8), 1212-1225, (2006)

E. Wisse, L.E. Govaert, H.E.H. Meijer, E.W. Meijer, Unusual Tuning of Mechanical Properties of Thermoplastic Elastomers using Supramolecular Fillers, Macromolecules, 39(21), 7425-7432, (2006)

2005

H.E.H. Meijer, L.E. Govaert, Mechanical performance of polymer systems: The relation between structure and properties, Prog. Polym. Sci., 30(8), 915-938, (2005)

E.T.J. Klompen, T.A.P. Engels, L.E. Govaert, H.E.H. Meijer, Modelling of the post-yield response of glassy polymers: influence of thermomechanical history, Macromolecules, 38(16), 6997-7008, (2005)

L.E. Govaert, T.A.P. Engels, E.T.J. Klompen, G.W.M. Peters, H.E.H. Meijer, Processing-induced properties in glassy polymers: development of yield stress in polycarbonate, International Polymer Processing, XX(2), 170-177, (2005)

E.T.J. Klompen, T.A.P. Engels, L.C.A. van Breemen, P.J.G. Schreurs, L.E. Govaert, H.E.H. Meijer, Quantitative prediction of long-term failure of Polycarbonate, Macromolecules, 38(16), 7009-7017, (2005)

2004

L.E. Govaert, Bob Haward, a chemist on the quest for strength, J. Polym. Sci., Polym.Phys.Ed., 42(11), iii-iv, (2004)

T.A. Tervoort, L.E. Govaert, Craze initiation kinetics in Polystyrene, J. Polym. Sci., Polym.Phys.Ed., 42(11), 2066-2077, (2004)

B.A.G. Schrauwen, R.P.M. Janssen, L.E. Govaert, H.E.H. Meijer, Intrinsic deformation behavior of semi-crystalline polymers, Macromolecules, 37(16), 6069-6078, (2004)

C.S.J. van Hooy-Corstjens, L.E. Govaert, A.B. Spoelstra, S.K. Bulstra, S.F.C.L. Wetzels, L.H. Koole, Mechanical behaviour of a new acrylic radiopaque iodine-containing bone cement, Biomaterials, 25(13), 2657-2667, (2004)

J.A.W. van Dommelen, B.A.G. Schrauwen, L.C.A. van Breemen, L.E. Govaert, Micromechanical modeling of the tensile behavior of oriented polyethylene, J. Polym. Sci., Polym.Phys.Ed., 42(16), 2983-2994, (2004)

C.S.J. van Hooy-Corstjens, Y.B.J. Aldenhoff, M. Knetsch, L.E. Govaert, E. Arin, H. Erli, L.H. Koole, Radiopaque polymeric spinal cages: a prototype study, J. Mater. Chem., 14, 3008-3013, (2004)

L.E. Govaert, T.A. Tervoort, Strain hardening of polycarbonate in the glassy state: influence of temperature and molecular weight, J. Polym. Sci., Polym.Phys.Ed., 42(11), 2041-2049, (2004)

B.A.G. Schrauwen, L.C.A. van Breemen, A.B. Spoelstra, L.E. Govaert, G.W.M. Peters, H.E.H. Meijer, Structure, deformation and failure of flow-oriented semi-crystalline polymers, Macromolecules, 37(23), 8618-8633, (2004)

2003

H.G.H. van Melick, O.F.J.T. Bressers, J.M.J. den Toonder, L.E. Govaert, H.E.H. Meijer, A micro-indentation method for probing the craze-initiation stress in glassy polymers, Polymer, 44(8), 2481 - 2491, (2003)

H.G.H. van Melick, L.E. Govaert, B. Raas, W.J. Nauta, H.E.H. Meijer, Kinetics of ageing and re-embrittlement of mechanically rejuvenated polystyrene, Polymer, 44(4), 1171-1179, (2003)

H.G.H. van Melick, L.E. Govaert, H.E.H. Meijer, Localisation phenomena in glassy polymers: influence of thermal and mechanical history, Polymer, 44(12), 3579-3591, (2003)

H.E.H. Meijer, L.E. Govaert, Multi-scale analysis of mechanical properties of amorphous polymer systems, Macromol. Chem. Phys., 204(2), 274-288, (2003)

H.G.H. van Melick, L.E. Govaert, H.E.H. Meijer, On the origin of Strain hardening in glassy polymers, Polymer, 44(8), 2493 - 2502, (2003)

J. Ho, L.E. Govaert, M. Utz, Plastic Deformation of Glassy Polymers, Mat. Res. Soc. Symp. Proc., 734, 97-102, (2003)

J. Ho, L.E. Govaert, M. Utz, Plastic Deformation of Glassy Polymers: Correlation Between Shear Activation Volume and Entanglement Density, Macromolecules, 36(19), 7398, (2003)

H.G.H. van Melick, L.E. Govaert, H.E.H. Meijer, Prediction of brittle-to-ductile transitions in polystyrene, Polymer, 44(2), 457-465, (2003)

P. Zuidema, L.E. Govaert, F.P.T. Baaijens, P.A.J. Ackermans, S. Asvadi, The influence of humidity on the viscoelastic behaviour of human hair, Biorheology, 40(4), 431-439, (2003)

M.T.R. Moens, L.E. Govaert, G.W.M. Peters, H.E.H. Meijer, The thickness profile of UHMW-PE films during sequential biaxial drawing, Polymer Engng. & Sc., 43(1), 1, (2003)

2002

A.M. Goijaerts, L.E. Govaert, F.P.T. Baaijens, Experimental and numerical investigation on the influence of processing speed on the blanking process, J. Manufact. Sci. Eng., 124, 416-419, (2002)

H.G.H. van Melick, A..R. van Dijken, J.M.J. den Toonder, L.E. Govaert, H.E.H. Meijer, Near-surface mechanical properties of glassy polymers, Philos. Mag. A, 82(10), 2093-2102, (2002)

B.A.G. Schrauwen, L.E. Govaert, G.W.M. Peters, H.E.H. Meijer, The influence of flow-induced crystallization on the impact toughness of high-density polyethylene, Macromol. Symp., 185(1), 89-102, (2002)

2001

L.E. Govaert, H.J. Schellens, H.J.M. Thomassen, R.J.M. Smit, L. Terzoli, T. Peijs, A Micromechanical Approach to Time-Dependent Failure in Off-axis Loaded Polymer Composites, Composites, Part A, 32(12), 1697-1711, (2001)

A.M. Goijaerts, L.E. Govaert, F.P.T. Baaijens, Evaluation of Ductile Fracture Models for various Materials in Metal Blanking, J. Mat. Proc. Techn., 110(3), 312-323, (2001)

L.V. Raulea, A.M. Goijaerts, L.E. Govaert, F.P.T. Baaijens, Size effects in the processing of thin metal sheets, J. Mat. Proc. Techn., 115(1), 44-48, (2001)

L.E. Govaert, H.G.H. van Melick, H.E.H. Meijer, Temporary toughening of polystyrene through mechanical pre-conditioning. , Polymer, 42(3), 1271-1274, (2001)

2000

A.M. Goijaerts, Y.W. Stegeman, L.E. Govaert, D. Brokken, W.A.M. Brekelmans, F.P.T. Baaijens, Can a new experimental and numerical study improve metal blanking? , J. Mat. Proc. Techn., 103, 44-50, (2000)

L.E. Govaert, P.J. de Vries, P.J. Fennis, W.F. Nijenhuis, J.P. Keustermans, Influence of strain rate, temperature and humidity on the tensile yield behaviour of aliphatic polyketone. , Polymer, 41(5), 1959-1962, (2000)

L.E. Govaert, T. Peijs, Micromechanical Modeling of Time-Dependent Transverse Failure in Composite Systems, Mech. Time-depend. Mater., 4(3), 275-291, (2000)

A.M. Goijaerts, L.E. Govaert, F.P.T. Baaijens, Prediction of ductile fracture in metal blanking, J. Manufact. Sci. Eng., 122, 476-483, (2000)

T.A. Tervoort, L.E. Govaert, Strain-hardening behavior of polycarbonate in the glassy state, J. Rheol., 44(6), 1263-1277, (2000)

L.E. Govaert, P.H.M. Timmermans, W.A.M. Brekelmans, The influence of intrinsic strain softening on strain localization in polycarbonate: modeling and experimental validation. , J. Engng. Mat. Technol., 122, 177-185, (2000)

1999

Y.W. Stegeman, A.M. Goijaerts, D. Brokken, W.A.M. Brekelmans, L.E. Govaert, F.P.T. Baaijens, An experimental and numerical study of a planar blanking process, J. Mat. Proc. Techn., 87, 266-276, (1999)

E.T.J. Klompen, L.E. Govaert, Nonlinear viscoelastic behaviour of thermorheologically complex materials: a modeling approach, Mech. Time-depend. Mater., 3(1), 49-69, (1999)

1998

T.A. Tervoort, R.J.M. Smit, W.A.M. Brekelmans, L.E. Govaert, A constitutive equation for the elasto-viscoplastic deformation of glassy polymers, Mech. Time-depend. Mater., 1, 269-291, (1998)

1996

T.A. Tervoort, E.T.J. Klompen, L.E. Govaert, A multi-mode approach to finite, three-dimensional, nonlinear viscoelastic behavior of polymer glasses, J. Rheol., 40, 779-797, (1996)

1995

L.E. Govaert, T. Peijs, Influence of applied stress and temperature on the deformation behaviour of high-strength poly(vinylalcohol) fibres, Polymer, 36, 3589-3592, (1995)

T. Peijs, R.J.M. van Vught, L.E. Govaert, Mechanical properties of poly(vinyl alcohol) fibres and composites, Composites, 26, 83-90, (1995)

L.E. Govaert, T. Peijs, Tensile strength and work of fracture of oriented polyethylene fibre, Polymer, 36, 4425-4431, (1995)

1994

T. Peijs, E.A.M. Smets, L.E. Govaert, Strain rate and temperature effects on energy absorbtion of polyethylene fibres and composites, Appl. Comp. Mat., 1, 35-54, (1994)

B. Nysten, P. Gonry, J.-P. Issi, L.E. Govaert, P.J. Lemstra, Thermal conductivity of oriented polymer films, Therm. Conduct., 22, 521-530, (1994)

1993

A.A.J.M. Peijs, H.J. Schellens, L.E. Govaert, Creep behaviour of hybrid composites based on polyethylene and carbon fibres, Adv. Comp. Let., 2(6), 201-205, (1993)

C.W.M. Bastiaansen, H.-W. Schmidt, L.E. Govaert, P. Smith, Orientation of dychroic dyes in ultra-drawn polyethylenes, Polym. Prepr., 34(1), 776-777, (1993)

L.E. Govaert, C.W.M. Bastiaansen, P.J.R. Leblans, Stress-strain analysis of oriented polyethylene, Polymer, 34, 534-540, (1993)

1992

L.E. Govaert, P.J. Lemstra, Deformation behavior of oriented UHMW-PE fibers, Colloid Polym. Sci., 270, 455-464, (1992)

L.E. Govaert, B. Brown, P. Smith, Temperature dependence of the Young's modulus of oriented polyethylene, Macromolecules, 25, 3480-3483, (1992)

1991

L.E. Govaert, E.L.J.C.J. d'Hooghe, A.A.J.M. Peijs, A micromechanical approach to the viscoelasticity of unidirectional hybrid composites, Composites, 22, 113-119, (1991)

1990

A.A.J.M. Peijs, P. Catsman, L.E. Govaert, P.J. Lemstra, Hybrid composites based on polyethylene and carbon fibres. Part 2: Influence of composition and adhesion level of polyethylene fibres on mechanical properties, Composites, 21, 513, (1990)

1989

P.J.R. Leblans, C.W.M. Bastiaansen, L.E. Govaert, Viscoelastic properties of UHMW-PE fibers in simple elongation, J. Polym. Sci., Polym.Phys.Ed., 27, 1009-1016, (1989)

More publications

An extended list of publications of Leon Govaert can be found here.