Creep crack growth in an elastic-creeping material Part II: mode I

✍ Scribed by T. C. Chang; C. H. Popelar; G. H. Staab

• Publisher: Springer Netherlands
• Year: 1987
• Tongue: English
• Weight: 739 KB
• Volume: 33
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00034897

✦ Synopsis

The quasi-static growth of a crack in an elastic-creeping material under mode I loading is investigated. The creep strain rate of the material is assumed to be governed by a power law involving the stress and creep strain. The major emphasis of this investigation is on elastic-primary creep response. The asymptotic crack tip fields for a quasi-statically extending crack under conditions of plane strain and plane stress are developed. The asymptotic fields are unambiguously determined in terms of the instantaneous crack speed and material parameters and are independent of the prior crack history, specimen geometry, and loading. A plane strain finite element analysis is performed to determine the complete stress and strain fields. These fields are compared with the asymptotic ones to establish the zone of dominance of the crack tip fields. The zone of dominance can be a very small fraction of the size of the creep zone attending the crack tip.