Fatigue fracture mechanism and life assessment for irregular film cooling hole structures in Ni-based single crystal turbine blades

被引：1
|
作者：
Pei, H. Q. [1 ]
Shi, L. J. [1 ]
Ma, M. Q. [1 ]
Li, F. [1 ]
Li, Z. [1 ]
Wen, Z. X. [1 ]
Li, Z. W. [2 ]
Yue, Z. F. [1 ]
机构：
[1] Northwestern Polytech Univ, Sch Mech Civil Engn & Architecture, Xian 710129, Peoples R China
[2] Tongji Univ, Sch Aerosp Engn & Appl Mech, Shanghai 200092, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2024年 / 310卷
基金：
中国国家自然科学基金;
关键词：
Ni-based single crystal turbine blades; Irregular film cooling holes; Crystal shaping theory; Fatigue life; BEHAVIOR; PREDICTION;
D O I：
10.1016/j.engfracmech.2024.110506
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Film cooling holes are the main cooling structures in nickel-based single-crystal cooling turbine blades. To evaluate the low-cycle fatigue life of irregular gas film holes, nine types of Ni-based single-crystal flat-plate test pieces with irregular film cooling holes of different shapes were designed in this study. Fatigue tests were performed at high temperature (850 degree celsius) and the multiscale fracture mechanisms of the samples analyzed in detail. The stress-strain field around the irregular film cooling holes was analyzed based on crystal plasticity theory using the finite element method. Three life prediction models based on the Coffin-Manson-Basquin formula, maximum principal strain, and crystal plasticity theory were proposed to predict the fatigue life of irregular film-cooled pore structures. The predicted results are all within the double-error band.
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页数：19
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