Fatigue Assessment of Inclined Film Cooling Holes in Nickel-Based Single-Crystal Superalloy

被引：2
作者：
Weng, Huanbo [1 ]
Luo, Cheng [1 ]
Yuan, Huang [1 ]
Gu, Yuanxing [2 ]
机构：
[1] Tsinghua Univ, Sch Aerosp Engn, Beijing 100084, Peoples R China
[2] AECC Sichuan Gas Turbine Res Inst, Chengdu 610500, Peoples R China
来源：
AIAA JOURNAL | 2024年 / 62卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Cooling Technology; Superalloys; Fatigue (Materials); Stress Concentration; Mechanical Testing; Plastic Deformation; Crack Opening Displacement; Stress-Strain Analysis; Plasticity; Scanning Electron Microscope; NOTCHED COMPONENTS; CRITICAL DISTANCES; CRITICAL PLANE; CYCLE FATIGUE; LIFETIME; FAILURE; MODEL;
D O I：
10.2514/1.J064178
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
Fatigue tests of nickel-based single-crystal superalloys with inclined film cooling holes (FCHs) at 1000 degrees C were conducted to investigate the effects of crystal orientation and to quantify the fatigue performance of the high-temperature structures. Fractographic analysis and computations of stress concentrations revealed competitive failure mechanisms between mode I crack nucleation and fatigue crack growth in crystallographic plastic slip systems, whereas crack nucleation around inclined FCHs can be characterized by the known fatigue criteria derived for smooth specimens. A life prediction model based on the crystal slip mechanism and the theory of critical distance was introduced to predict the fatigue life of FCH structures and provided reasonable accuracy for different FCH specimens.
引用
收藏
页码：3999 / 4010
页数：12
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