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

0532869 - ÚFM 2021 RIV US eng J - Journal Article
Miarka, Petr - Cruces, A. S. - Seitl, Stanislav - Malíková, Lucie - Lopez-Crespo, P.
Influence of the constraint effect on the fatigue crack growth rate in S355 J2 steel using digital image correlation.
Fatigue and Fracture of Engineering Materials and Structures. Roč. 43, č. 8 (2020), s. 1703-1718. ISSN 8756-758X. E-ISSN 1460-2695
R&D Projects: GA ČR GA17-01589S
Institutional support: RVO:68081723
Keywords : constraint effect * DIC * Fatigue * ODM * S355 J2 * Williams expansion
OECD category: Civil engineering
Impact factor: 3.459, year: 2020
Method of publishing: Limited access
https://onlinelibrary.wiley.com/doi/abs/10.1111/ffe.13198

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.
Permanent Link: http://hdl.handle.net/11104/0311260