Fei Li

• Doctor of Philosophy
• Asst. Prof. at Ph.D at Northwestern Polytechnical University & Postdoc at Harbin Institute of Technology

Film cooling holes (FCHs) in nickel-based single crystal superalloy turbine blades are critical yet fracture-prone regions, where assessing initial manufacturing damage and predicting fatigue life remain significant challenges. This study employs the equivalent initial flaw size (EIFS) model to evaluate initial damage in FCH structures and introduc...

This study investigates a Nickel-based single crystal (SX) superalloy with femtosecond laser-drilled film-cooling holes (FCHs) under varying temperatures (room temperature, 850 °C, and 980 °C), employing a novel framework for predicting fatigue life based on initial manufacturing damage quantification. For all tested anisotropic SX superalloy speci...

Turbine blades in aviation engines commonly feature a nickel-based superalloy structure integrated with film cooling holes to enhance inlet gas temperature. However, the presence of these film cooling holes often results in frequent occurrences of fracture failures nearby. The direct current potential drop (DCPD) method, renowned for its exceptiona...

This work systematically investigates the orientation deviation effect on the elastoplastic deformation of a dual‐phase, nickel‐based single‐crystal superalloy through a combined experimental study and crystal plasticity finite element modelling method (CPFEM). Physically based, dual‐phase microstructural model was developed based on scanning elect...

Film cooling holes (FCHs) geometric structure significantly affects low‐cycle fatigue (LCF) of the single crystal turbine blade. This study investigates the LCF behavior of Ni‐based single crystal plate specimens with two different structure FCHs, including elliptical and fan‐shaped FCHs, by high temperature fatigue tests and crystal plasticity sim...

Purpose The purpose of this paper is to apply the concept of equivalent initial flaw size (EIFS) to the anisotropic nickel-based single crystal (SX) material, and to predict the fatigue life on this basis. The crack propagation law of SX material at different temperatures and the weak correlation of EIFS values verification under different loading...

In this study, a new framework for the fatigue life prediction of nickel-base single crystal (SX) superalloys with different drilling film cooling holes (FCHs) at high temperatures (900 ℃ and 980 ℃) is investigated based on surface integrity quantification and fracture mechanics. For all the tested SX superalloys with anisotropy (smooth and FCHs sp...

This paper presents a novel modeling framework for predicting fatigue life performance with varying film cooling holes (FCHs). Within this framework, in-situ crack propagation tests of nickel-based single-crystal plate specimens with two different drilling FCHs were carried out at room temperature. Based on the equivalent initial flaw size (EIFS) c...

The fatigue crack initiation and propagation behavior of film cooling holes (FCHs) under different drilling processes are of great significance to key structural parts. In this paper, it mainly comprehensively and systematically summarized the difference in surface condition caused by different drilling processes of nickel-based superalloys combini...

The initial quality assessment and total fatigue life prediction of film cooling holes under different drilling processes have great impact on key structural components. In this paper, the initial fatigue quality of nickel-based superalloys with different drilling processes were evaluated and the fatigue life was predicted based on the equivalent i...

The equivalent initial flaw size (EIFS) concept was developed to provide an initial damage state for fracture mechanics-based life prediction. This study focuses on the safe fracture fatigue life prediction based on EIFS concept. A novel assessment method (M-K-T), the maximum likelihood estimation (MLE) method updated by modified Kitagawa-Takahashi...