Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 118, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2021.103224
Keywords
Fatigue crack growth; Small-scale specimens; Intrinsic fatigue propagation threshold; Near-threshold regime; High-strength steel; Alternative test procedure
Categories
Funding
- Czech Science Foundation [20-00761S]
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A complete description of the experimental procedure for characterizing the intrinsic fatigue crack propagation threshold (delta(Kth,eff)) and the fatigue crack growth rate (FCGR) in small-scale specimens is presented. The results show a good agreement between tests conducted on different specimen sizes, indicating the potential of using small-scale specimens for characterizing fatigue crack growth properties in metallic materials. Recommendations and limitations of the procedure are provided and discussed.
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.
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