TMF constitutive and life modeling: From smooth specimen to turbine blade

HU Xiaoan; SHI Duoqi; YANG Xiaoguang; YU Huichen

doi:10.7527/S1000-6893.2018.22494

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 3: 422494 - 422494

DOI: https://doi.org/10.7527/S1000-6893.2018.22494

Material Engineering and Mechanical Manufacturing

TMF constitutive and life modeling: From smooth specimen to turbine blade

HU Xiaoan ,
SHI Duoqi ,
YANG Xiaoguang ,
YU Huichen

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1. School of Aircraft Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Jiangxi Key Laboratory of Micro Aeroengine,Nanchang 330063, China;
3. School of Energy and Power Engineering, Beihang University, Beijing 100083, China;
4. Beijing Institute of Aeronautical Materials, AECC, Beijing 100095, China

Received date: 2018-06-28

Revised date: 2018-07-12

Online published: 2018-10-19

Supported by

The National Basic Research Program of China (2015CB057400); The National Key Research and Development Program of China (2017YFB0702004)

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Abstract

Thermomechanical fatigue (TMF) constitutive and life models considering transient temperature effect are developed for hollow turbine blades. Firstly, TMF tests of smooth and notched specimens are carried out to test a directionally solidified superalloy DZ125 that is used for the turbine blade. The effect of phase, temperature range and stress concentration factor on TMF lives are obtained. Secondly, The mechanism of fatigue crack initiation that lead to failure of light bar and notch TMF is revealed by means of material microstructure analysis.Thirdly, based on the Chaboche type constitutive model, a cyclic and creep constitutive model is established to investigate the anisotropic, isothermal and creep damage effects. Stress and strain responses under tensile, isothermal cyclic, creep, creep fatigue and TMF are simultaneously modeled and predicted. Fourthly, a TMF life modeling coupling fatigue, creep and oxidation damage is developed and using baseline data including pure fatigue and creep, the parameters of the model are obtained. A nominal stress based method is further developed to predict TMF lives of notched specimens. Finally, the transient deformation and life prediction carried out for a turbine blade subject to a certain loading profile.

Key words： thermomechanical fatigue; creep; oxidation; turbine blade; life prediction; superalloy

Cite this article

HU Xiaoan , SHI Duoqi , YANG Xiaoguang , YU Huichen . TMF constitutive and life modeling: From smooth specimen to turbine blade[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(3) : 422494 -422494 . DOI: 10.7527/S1000-6893.2018.22494

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