Journal article
Effects of Coatings on the High-Cycle Fatigue Life of Threaded Steel Samples
Department of Wind Energy, Technical University of Denmark1
Wind Turbine Structures and Component Design, Department of Wind Energy, Technical University of Denmark2
Composites Mechanics and Materials Mechanics, Department of Wind Energy, Technical University of Denmark3
Department of Mechanical Engineering, Technical University of Denmark4
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark5
Materials science and characterization, Department of Wind Energy, Technical University of Denmark6
In this work, high-cycle fatigue is studied for threaded cylindrical high-strength steel samples coated using three different industrial processes: black oxidation, normal-temperature galvanization and high-temperature galvanization. The fatigue performance in air is compared with that of uncoated samples.
Microstructural characterization revealed the abundant presence of small cracks in the zinc coating partially penetrating into the steel. This is consistent with the observation of multiple crack initiation sites along the thread in the galvanized samples, which led to crescent type fracture surfaces governed by circumferential growth.
In contrast, the black oxidized and uncoated samples exhibited a semicircular segment type fracture surface governed by single-sided growth with a significantly longer fatigue life. Numerical fatigue life prediction based on an extended Paris-law formulation has been conducted on two different fracture cases: 2D axisymmetric multisided crack growth and 3D single-sided crack growth.
The results of this upper-bound and lower-bound approach are in good agreement with experimental data and can potentially be used to predict the lifetime of bolted components.
| Language: | English |
|---|---|
| Publisher: | Springer US |
| Year: | 2018 |
| Pages: | 3184-3198 |
| ISSN: | 15441024 and 10599495 |
| Types: | Journal article |
| DOI: | 10.1007/s11665-018-3399-2 |
| ORCIDs: | Eder, Martin Alexander , Haselbach, Philipp Ulrich and Mishin, O. V. |
Coating Cracks High-cycle fatigue failure analysis High-strength steel bolts Life prediction Microscopy Modeling and simulation
Characterization and Evaluation of Materials Chemistry and Materials Science Engineering Design Materials Science Quality Control, Reliability, Safety and Risk Tribology, Corrosion and Coatings coating cracks high-cycle fatigue failure analysis high-strength steel bolts life prediction microscopy modeling and simulation
