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Fatigue crack growth in Haynes 230 single crystals: an analysis with digital image correlation
Author(s) -
Rabbolini S.,
Pataky G. J.,
Sehitoglu H.,
Beretta S.
Publication year - 2015
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.12261
Subject(s) - digital image correlation , materials science , superalloy , anisotropy , paris' law , displacement (psychology) , stress intensity factor , crack closure , plasticity , finite element method , yield (engineering) , crack tip opening displacement , structural engineering , composite material , metallurgy , fracture mechanics , optics , microstructure , engineering , physics , psychology , psychotherapist
Fatigue crack growth was investigated in Haynes 230, a nickel‐based superalloy. Anisotropic stress intensity factors were calculated with a least squares algorithm using the displacements obtained from digital image correlation. Crack opening/sliding levels were measured by analysing the relative displacement of crack flanks. Reversed crack tip plastic zones were calculated adopting an anisotropic yield criterion. The strains measured in the reversed plastic zone by digital image correlation showed a dependence on crystallographic orientation. Finally, a finite element model was adopted to examine plasticity around the crack tip. Results were compared with the experimentally observed strains.