Predicting high-cycle fatigue strength and three-dimensional fatigue crack growth in simulated compressor blade by phase-field model

被引：0
作者：
Sun, Shen [1 ,2 ,3 ,4 ]
Liu, Shijie [5 ,6 ]
He, Weiwei [1 ,2 ,3 ,4 ]
Zhang, Xuan [1 ,2 ,3 ,4 ]
Tang, Wei [1 ,2 ,3 ,4 ]
Zhou, Liucheng [7 ]
Yi, Min [1 ,2 ,3 ,4 ,8 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut NUAA, State Key Lab Mech & Control Aerosp Struct, Nanjing 210016, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut NUAA, Key Lab Intelligent Nano Mat & Devices, Minist Educ, Nanjing 210016, Peoples R China
[3] Nanjing Univ Aeronaut & Astronaut NUAA, Inst Frontier Sci, Nanjing 210016, Peoples R China
[4] Nanjing Univ Aeronaut & Astronaut NUAA, Coll Aerosp Engn, Nanjing 210016, Peoples R China
[5] Beijing Aerosp Prop Inst, Beijing 100076, Peoples R China
[6] Lab Sci & Technol Cryogen Liquid Prop, Beijing 100076, Peoples R China
[7] Air Force Engn Univ, Natl Key Lab Aerosp Power Syst & Plasma Technol, Xian 710038, Peoples R China
[8] Natl Key Lab Strength & Struct Integr, Xian 710065, Peoples R China
来源：
AEROSPACE SCIENCE AND TECHNOLOGY | 2025年 / 159卷
关键词：
Phase-field model; Crack propagation; Fatigue strength; Compressor blade; BRITTLE-FRACTURE; VIBRATION ANALYSIS; DAMAGE MODEL; FAILURE;
D O I：
10.1016/j.ast.2025.110009
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
High-cycle fatigue is a major concern for aeroengine compressor blades under complex cyclic mechanical and aerodynamic loads, but predicting fatigue behavior of blades remains challenging. Herein, a phase-field fatigue fracture model is applied to simulate the high-cycle fatigue behavior of the simulated compressor blade. In the phase-field model, a logarithmic degradation function is adopted to describe the fracture toughness decreasing with fatigue cycles. Cyclic loads are mimicked by the pressure applied on the blade surface. The three-dimensional (3D) fatigue crack propagation of the simulated blade is simulated. It is found that the fatigue crack initiates at the variable cross-section and propagates horizontally. Laser shock peening (LSP) is further shown to improve the fatigue properties, i.e., LSP induced compressive residual stress results in a 95% increase of fatigue life and notably retards the 3D fatigue crack growth. For the fatigue strength of both the original and LSPed blades, the predictions are within the +/- 5% error band. The phase-field model here provides a predictive approach for the evaluation of high-cycle fatigue behavior and shows a great potential in the optimal design of durable and reliable compressor blades.
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页数：14
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