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Determination of fatigue crack growth in the near-threshold regime using small-scale specimens
- 1.0557098 - ÚFM 2023 RIV NL eng J - Journal Article
Blason, S. - Werner, T. - Kruse, J. - Madia, M. - Miarka, Petr - Seitl, Stanislav - Benedetti, M.
Determination of fatigue crack growth in the near-threshold regime using small-scale specimens.
Theoretical and Applied Fracture Mechanics. Roč. 118, APR (2022), č. článku 103224. ISSN 0167-8442. E-ISSN 1872-7638
R&D Projects: GA ČR(CZ) GA20-00761S
Institutional support: RVO:68081723
Keywords : tensile * Fatigue crack growth * Small-scale specimens * Intrinsic fatigue propagation threshold * Near-threshold regime * High-strength steel * Alternative test procedure
OECD category: Construction engineering, Municipal and structural engineering
Impact factor: 5.3, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0167844221003207?via%3Dihub
A complete description of the experimental procedure for characterizing the intrinsic fatigue crack propagation threshold (delta(Kth,eff)) as well as the fatigue crack growth rate (FCGR) in the near-threshold regime using small-scale specimens is presented. A comparative study is carried out on the high strength steel S960QL considering different single edge notch bend (SENB) specimen geometries. On one hand, the reference dimensions of 6 mm thickness (B) and 19 mm width (W) are analysed and referred to as conventional specimens. On the other hand, small-scale specimens with B = 3 mm and W = 4 and 6 mm are also considered. Several loading configurations (3, 4-and 8-point bending) are used and a load ratio R = 0.8 is applied to avoid crack closure effects. The direct current potential drop (DCPD) technique is used to monitor the crack length. The reduced dimensions of the small-scale specimens imply the necessity of implementing a modified testing procedure compared to the recommendations of current standards for the generation of FCGR data. The results show a good agreement between tests conducted on different specimen sizes, which opens new perspectives in the use of small-scale specimens for characterizing the fatigue crack growth properties in metallic materials. Recommendations and limitations of the procedure are provided and discussed.
Permanent Link: http://hdl.handle.net/11104/0331179
Number of the records: 1