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The crack tip fields in viscoplastic materials are analysed by the finite element method. The mesh refinement required for an accurate description is determined from a comparison of the FE-results with analytical near-tip solutions. For the determination of the crack tip parameter C(t) or the creep zones, a much coarser mesh is adequate. It is demonstrated that C(t) can be approximated by an interpolation formula and that it is independent of the mathematical form of the constitutive equations if the material parameters are determined from the same set of uniaxial creep curves. The way in which C(t) depends on the load is, in general, not known, whereas for the Norton law scaling relations are available.

Additional information

Authors: WALZ G, University of Karlsruhe, Institute for Reliability and Failure Analysis in Engineering (DE);STAMM H, JRC Ispra (IT)
Bibliographic Reference: Article: International Journal of Fracture, Vol. 64 (1993) pp. 157-178
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