Influence of the constraint effect on the fatigue crack growth rate in S355 J2 steel using digital image correlation

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 t...

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Bibliographic Details
Published inFatigue & fracture of engineering materials & structures Vol. 43; no. 8; pp. 1703 - 1718
Main Authors Miarka, Petr, Cruces, Alejandro S., Seitl, Stanislav, Malíková, Lucie, Lopez‐Crespo, Pablo
Format Journal Article
LanguageEnglish
Published Oxford Wiley Subscription Services, Inc 01.08.2020
Subjects
constraint effect
Correlation analysis
Crack propagation
Crack tips
DIC
Digital imaging
Displacement
Fatigue
Fatigue failure
Finite element method
Fracture mechanics
ODM
Plastic zones
S355 J2
Stress intensity factors
Williams expansion
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Summary: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.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13198