Abstract
Convergence properties of various finite element based methods for the evaluation of the crack-tip field amplitude in creep C are examined on some representative examples. In particular, the case of non-steady-state creep, when C is contour-dependent with significant interior convergence properties, is studied. It is demonstrated that the virtual crack extension (VCE) implementation exhibits significantly better convergence properties than the conventional domain and contour integral methods. The VCE method also exhibits very good convergence for J evaluation, which does not have any direct physical interpretation for dominating creep but can be useful for C estimates. The background for these estimates is summarised.
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