Understanding of the fatigue crack nucleation in metallic sealing rings by explicitly incorporating the deformation history from manufacturing to service. (November 2022)

• Record Type: Journal Article
• Authors: Zheng, Zebang; Zhao, Pandi; Zhan, Mei; Li, Hongwei; Lei, Yudong; Fu, M.W.
• Is Part Of: International journal of fatigue. Volume 164(2022)
• Publication Date: 2022-11
• Subjects: Fatigue crack nucleation -- Three-point bending -- Stored energy density -- Crystal plasticity -- Complex deformation history; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107174
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: The critical value of stored energy density that drives fatigue crack nucleation in GH4169 superalloys is determined. The deformation history from manufacturing to service of metallic sealing rings is explicitly simulated. The fatigue life may be overestimated if the manufacturing process is not appropriately considered. The preload shows the most significant effect on the fatigue life of metallic sealing rings. Abstract: Fatigue cracking in metallic sealing rings has been a concern for the aerospace industry because the formation of even a micro-crack may cause an aviation accident. In this study, an integrated three-point bending fatigue experiment and dislocation-based crystal plasticity finite element modeling was used to determine the threshold for fatigue crack nucleation. Subsequently, the fatigue lives of the rings under different service conditions were evaluated based on the local stored energy density evolution. The conclusions of this work can provide theoretical guidance for the manufacturing of high-performance metallic sealing rings.