RA-based fretting fatigue life prediction method of Ni-based single crystal superalloys

• Published in: Tribology international Vol. 134; pp. 109 - 117
• Main Authors: Sun, Shouyi, Li, Lei, Yang, Weizhu, Yue, Zhufeng, Wan, Huan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.06.2019; Elsevier BV
• Subjects: Accumulated dissipated energy; Crack initiation; Crack propagation; Damage accumulation; Dissipation factor; Fatigue cracking; Fatigue failure; Fatigue life; Finite element analysis; Finite element method; Fracture mechanics; Fretting fatigue; Interaction parameters; Life prediction; Ni-based single crystal (NBSX); Nickel base alloys; Resolved shear stress; Service life; Shear stress; Single crystals; Stress concentration; Superalloys; Turbine blades; Wear; Ni-based single crystal (NBSX); Finite element analysis; Accumulated dissipated energy; Fretting fatigue; Resolved shear stress
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2019.01.036

Fretting fatigue damage can significantly reduce the service life of Ni-based single crystal (NBSX) superalloys turbine blades. In this work, we proposed a fretting fatigue life prediction method by considering cracking, wear and their mutual interaction. Specifically, a parameter, denoted as RA, is developed with combination of Resolved shear stress based damage factor and Accumulated dissipated energy based damage factor, by which the contribution from cracking and wear are described respectively. The proposed method is validated with experimental data in the literature. Finite element analyses are performed to study the distribution of stresses and strains. Results show that the predicted crack initiation site, failure plane and life cycles are consistent with the experimental results. •Considering the effects of crystal orientation on fretting fatigue behavior of Ni-based single crystal superalloy (NBSX).•Resolved shear stress and accumulated dissipated energy are used to describe the damage of cracking and wear, respectively.•The fretting fatigue damage of NBSX is quantified with comprehensive consideration of both cracking and wear.