Background and activities

Areas of activity

Mechanical Integrity and Fatigue Design


Recent and current research activities

  • FeVIND: Fatigue assessment (methods and data) of ductile cast iron components for wind turbines
    • Weakest-link modelling, size effect
    • Determination of size distribution of casting defects by means of X-ray computed tomography
    • Monte-Carlo simulation of fatigue-crack growth from randomly distributed casting defects
  • MATSINT: Fatigue assessment of notches and cracks in ductile cast iron
    • Self-arresting cracks at notches
    • Fatigue assessment of notched components
    • Growth of (short) fatigue cracks
  • Advanced Fatigue Modelling in Design
    • Statistical description of defects
    • Probabilistic modelling of fatigue limit
  • Multiaxial fatigue assessment criteria
  • Probabilistic fatigue assessment of Francis turbine runners


Current teaching activities


Education and Experience

  • Professor of Solid Mechanics at NTH (Trondheim)
  • Visiting Professor at KTH (Stockholm), ETH (Zürich), University of Oxford and Visiting Fellow of Lincoln College (Oxford)
  • Research work on
    • Non-metallic inclusions and fatigue
    • Prestressed (wire-wound) high-pressure vessels
    • Fatigue and creep at notches
    • High-temperature fatigue
    • Creep design
    • Thermal stress
    • Fretting fatigue
    • Gas-turbine blades and disks
    • Growth of short fatigue cracks
    • Fatigue cracks at notches and defects incl. self-arresting cracks
    • Weakest-link fatigue analysis
    • Fatigue assessment of (heavy) components of ductile cast iron
    • FEA post-processor for fatigue assessment
    • Multiaxial fatigue
    • Fatigue assessment of Francis turbine runners
  • NTNU course in Machine Elements during ten years; Author of textbook (Tapir, 2004, edited reprint 2012) Dimensjonering av maskindeler
  • Twenty years of experience from Swedish and Swiss industry with responsibility for advanced stress and lifetime analyses, materials development and materials selection for gas and steam turbines and high-pressure equipment.
  • MSc (Engineering Physics) and DSc (Solid Mechanics) from KTH (Stockholm)


Membership in Academic and Professional Committees and Societies, Awards

  • Member of the Swedish Fatigue Network, UTMIS (SE), member of the board 2007-2010
  • Member of the European Structural Integrity Society, ESIS
  • Fellow of the Institution of Mechanical Engineers, IMechE (UK), since 2008
  • Member of the Editorial Board of the Journal of Strain Analysis (UK) 1998-2007
  • CEGB Prize 2004
  • Life Member of the American Society of Mechanical Engineers, ASME (US)



Search under 'Research results/NVI, Surname: Härkegård or H*rkeg*rd, First name: Gunnar 



Scientific, academic and artistic work

A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database

Journal publications