文献类型：期刊文献

英文题名：Multiaxial creep-fatigue failure mechanism and life prediction of a turbine blade based on a unified numerical solution approach

作者：Zhang, Xin-Hao[1];Xu, Le[2];Wang, Run-Zi[3,4];Lu, Ti-Wen[1];He, Lei[5];Itoh, Takamoto[5];Zhang, Xian-Cheng[1,6]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China;[2]Tohoku Univ, Fracture & Reliabil Res Inst, Grad Sch Engn, Sendai, Miyagi 9808579, Japan;[3]Tohoku Univ, Adv Inst Mat Res WPI AIMR, Sendai, Japan;[4]Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Sendai, Japan;[5]Ritsumeikan Univ, Coll Sci & Engn, Kusatsu, Japan;[6]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2024

卷号：47

期号：8

起止页码：3015

外文期刊名：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录：;EI(收录号：20242316216177);WOS:【SCI-EXPANDED(收录号:WOS:001238436800001)】；

基金：This study was supported financially by the National Natural Science Foundation of China (Nos. 52005185, U21B2077), Young Elite Scientists Sponsorship Program by CAST (YESS20200029), the Grant-in-Aid for Core Research Cluster for Materials Science, Advanced Institute for Material Research, Tohoku University, and the Kyoto Technoscience Center.

语种：英文

外文关键词：aerospace engineering; creep-fatigue damage; Inconel 718 superalloy; life prediction method; multiaxial loading conditions; turbine blade; unified numerical solution approach

摘要：Exposure of turbine blades to cyclic torsional loading at high temperature, stemming from pre-torque installation and the aerodynamic forces during operation, has the potential to induce substantial creep-fatigue damage, thereby contributing to the likelihood of premature failure. Investigating the deformation mechanisms and proposing a reliable life prediction method aiming at torsional loading is critical to ensure the structural integrity of turbine blades. This study conducted strain-controlled fatigue and creep-fatigue tests on Inconel 718 superalloy, employing a multiaxial servo-hydraulic testing machine. Electron backscattering diffraction elucidated deformation and damage mechanisms, forming a basis for subsequent constitutive modeling and life prediction. The lack of creep-fatigue mechanical behavior and microscopic failure mechanism when stress triaxiality equal to 0 is filled, which provides the theoretical basis and data support for the life design and damage assessment of this material under extreme service conditions. The unified viscoplasticity constitutive model effectively characterized macroscopic deformation under torsional loading. Prediction of creep-fatigue life under torsional loading, utilizing the multiaxial ductility factor-modified strain energy density exhaustion model, demonstrated excellent alignment with experimental findings. Finally, parametric analyses of stress distribution and damage assessment under different conditions were carried out for the example of a turbine blade with relatively rarely considered aerodynamic loading as a variable. It is expected to be popularized and applied in life design and damage assessment of high-temperature structures under multiaxial loading in engineering. Constitutive modeling for torsional creep-fatigue behaviors. Microscopic quantitative analysis of creep-fatigue under torsional loading. Accuracy of life prediction methods under multiaxial stress state loading. Finite element analysis and damage detection of structurally complex components.