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Investigation of creep crack growth - a comparison between experimental and numerical results

: Hollstein, T.; Kienzler, R.

Bensussan, P.; Chaboche, J.L.; Chevalier, J.F.; Dambrine, B.; Fournier, D.; Masson, S.; Mascarell, J.P.; Piques, R.:
High Temperature Fracture Mechanisms and Mechanics
London: Mechanical Engineering Publications, 1987
High Temperature Fracture Mechanisms and Mechanics <1987, Dourdan>
Conference Paper
Fraunhofer IWM ()
Bruchmechanik; Finite-Elemente-Methode (FEM); Kriechrißwachstum

Creep crack growth in the 21 CrMoNiV 5 7 steel can be described by a power law using the C integral. At the lower end of the data plot, some indications of size (triaxiality) dependences seem to exist. Calculations on the basis of a Norton law for the minimum-creep rate of uniaxial tension specimens are, already, in good agreement with experimental results. The consideration of primary creep is desirable for a more realistic simulation and for better understanding of the whole specimen behavior. A stationary model is adequate to simulate the first part of an experiment where crack growth plays no specific role. If crack growth is significant, calculations including crack growth under plane-strain and plane-stress situations supply lower and upper bounds, respectively, to the experimental results. (IWM)