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Influence of the constraint effect on the fatigue crack growth rate in S355 J2 steel using digital image correlation
Author(s) -
Miarka Petr,
Cruces Alejandro S.,
Seitl Stanislav,
Malíková Lucie,
LopezCrespo Pablo
Publication year - 2020
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.13198
Subject(s) - digital image correlation , paris' law , displacement (psychology) , materials science , constraint (computer aided design) , stress intensity factor , structural engineering , stress (linguistics) , finite element method , mechanics , stress concentration , digital image , image (mathematics) , fracture mechanics , crack closure , composite material , mathematics , geometry , engineering , image processing , physics , computer science , psychology , linguistics , philosophy , psychotherapist , artificial intelligence
Displacement fields around the fatigue crack tip for a constant value of stress intensity factor (SIF) range were measured using digital image correlation (DIC) technique on the S355 J2 steel grade. The data obtained were resolved into the T ‐stress evaluation and quantification of its influence on the fatigue crack growth rate. The higher order terms of the Williams expansion (WE) were calculated as well. The displacements of a set of points outside of the plastic zone were selected for application of the over‐deterministic method (ODM) to obtain several initial WE terms. The computed values of T‐stress show good agreement with finite element analysis and literature. It was shown by collected experimental displacement, that the level of constraint influences the fatigue crack propagation rate.