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A macroscopic stationary crack in a typical viscoplastic material is considered. It is shown that, in the limit of high stresses, the constitutive equations simplify to a simple creep law thus leading at the crack tip to a HRR-type of singular field if a power-law representation is used. The amplitude of the crack tip field can be evaluated using a modified integral which includes a domain integral term and reduces to the well known expression at the crack tip, but which is, in contrast, path independent within the creep zone. These results are confirmed by finite element calculations.

Additional information

Authors: WALZ G, Universität Karlsruhe (DE);STAMM H, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 5th International Conference on Numerical Methods in Fracture Mechanics, Freiburg (DE), April 23-27, 1990
Availability: Available from (1) as Paper EN 35286 ORA
ISBN: ISBN 0-906674-73-5
Record Number: 199011563 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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