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Representation of the high‐temperature crack tip fields using reference stress concepts
Author(s) -
HABIBULLAH M. S.,
PONTER A. R. S.
Publication year - 2006
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2006.00999.x
Subject(s) - creep , materials science , representation (politics) , structural engineering , field (mathematics) , exponent , stress (linguistics) , crack closure , stress field , composite material , mechanics , fracture mechanics , mathematics , engineering , finite element method , physics , linguistics , politics , political science , pure mathematics , law , philosophy
In a previous paper, it was shown that an estimation approach to crack tip properties under cyclic creep loading conditions was described, using a methodology based on the linear matching method (LMM). The calculations revealed the possibility of obtaining the crack tip parameters, C * ( n ), for cracked structures subjected to both mechanical loads and temperatures, using the HRR field criterion as the crack tip condition. In this paper, those calculated values of C * ( n ) are re‐interpreted and presented in terms of the reference stresses, insensitive to the constitutive models and creep exponent. These reference stress values are compared with those currently used for life assessment of high‐temperature plant, showing that current practice is significantly conservative for thermal loading.