An analytical and computational study of crack initiation under transient creep conditions

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:44

Article; Proceedings Paper

Davies, C. M. ; O'Dowd, N. P. ; Nikbin, K. M. ; Webster, G. A.

关键词: creep crack initiation;    fracture mechanics;    transient creep;    finite element analysis;    HRR;    stress redistribution;   

DOI  :  10.1016/j.ijsolstr.2006.08.036

来源: Elsevier

【 摘 要 】

An analytical method has been developed to predict creep crack initiation (CCI), based on the accumulation of a critical level of damage at a critical distance. The method accounts for the re-distribution of stress from the elastic or elastic-plastic field, experienced on initial loading, to a steady state creep stress distribution, via a transient creep region. The method has been applied to predict CCI times in a fracture specimen of type 316H stainless steel at 550 degrees C. The failure model has been also been implemented into a finite element (FE) framework. Reasonable and conservative predictions of CCI time can be obtained from the analytical solution relative to FE solutions. Conservative predictions of experimental CCI times are obtained when stress redistribution is taking into account. However, CCI times predicted from a steady state creep model are found to be non-conservative. (c) 2006 Elsevier Ltd. All rights reserved.

【 授权许可】

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