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Three‐dimensional analyses of unified characterization parameter of in‐plane and out‐of‐plane creep constraint
Author(s) -
Ma H. S.,
Wang G. Z.,
Liu S.,
Tu S. T.,
Xuan F. Z.
Publication year - 2016
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/ffe.12361
Subject(s) - creep , plane (geometry) , constraint (computer aided design) , materials science , plane stress , range (aeronautics) , structural engineering , characterization (materials science) , stress (linguistics) , finite element method , mechanics , geometry , composite material , mathematics , physics , engineering , philosophy , nanotechnology , linguistics
Based on extensive three‐dimensional finite element analyses, the unified characterization parameter A c of in‐plane and out‐of‐plane creep constraint based on crack‐tip equivalent creep strain for three specimen geometries (C(T), SEN(T) and M(T)) were quantified for 316H steel at 550 °C and steady‐state creep. The distributions of the parameter A c along crack fronts (specimen thickness) were calculated, and its capability and applicability for characterizing a wide range of in‐plane and out‐of‐plane creep constraints in different specimen geometries have been comparatively analysed with the constraint parameters based on crack‐tip stress fields (namely R* , h and T Z ). The results show that the parameter A c in the centre region of all specimens appears uniform distribution and lower value (higher constraint), and in the region near free surface it shows protuberant distribution and higher value (lower constraint). The parameter A c can simultaneously and effectively characterize a wide range of in‐plane and out‐of‐plane creep constraints, while the parameters R* , h and T Z based on crack‐tip stress fields cannot achieve this. The different capabilities of these parameters for characterizing in‐plane and out‐of‐plane creep constraints originate from their underlying theories. The parameter A c may be useful for accurately characterizing the overall constraint level composed of in‐plane and out‐of‐plane constraints in actual high‐temperature components, and it may be used in creep life assessments for improving accuracy.