Record number :
448999
Title of article :
An analytical and computational study of crack initiation under transient creep conditions
Author/Authors :
C.M. Davies، نويسنده , , N.P. O’Dowd ، نويسنده , , K.M. Nikbin، نويسنده , , G.A. Webster، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
21
From page :
1823
To page :
1843
Abstract :
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 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.
Keywords :
Creep crack initiation , Fracture Mechanics , transient creep , Finite element analysis , HRR , Stress redistribution
Journal title :
International Journal of Solids and Structures
Serial Year :
2007
Link To Document :
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