Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 43, Issue 8, Pages 1703-1718Publisher
WILEY
DOI: 10.1111/ffe.13198
Keywords
constraint effect; DIC; Fatigue; ODM; S355 J2; Williams expansion
Funding
- Brno University of Technology internal grant [FAST-S-19-5896]
- Czech Science Foundation [17-01589S]
- Ministerio de Economia y Competitividad [MAT2016-76951-C2-2-P]
- Programa Opeativo FEDER (Junta de Andalucia, Spain) [UMA18-FEDERJA-250]
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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.
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