Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1548083 | Progress in Natural Science: Materials International | 2016 | 7 Pages |
Abstract
The fatigue crack propagation behavior of three superalloys subjected to a single overloading at elevated temperatures was investigated. The fatigue crack propagation rate FCPR versus stress intensity factor range data da/dN—ΔK were calculated using the two-point secant method. It was found that the crack growth rates of the investigated materials were retarded after overloading with an overload ratio ROL=1.6. The size of the plastic zone in the front of the crack tip and its relation to loading level were discussed. The overload retardation effects are attributed to crack closure. The fatigue damage in the plastic zone can also be a factor to explain the overload retardation.
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Authors
Xinyue Huang, Liang Wang, Yunming Hu, Guangping Guo, David Salmon, Ying Li, Wenxia Zhao,