The effects of stress gradient and size effect on fatigue life are investigated based on the distribution of stress at the notch root of notched specimens of GH4169 alloy. The relationship between the life of notched specimens and smooth specimens is correlated by introducing the stress gradient impact coefficient, and a new life model of predicting notched specimens based on the Walker modification for the mean stress effect is established. In order to improve the prediction precision of life model with the equation parameters having a definite physical significance, the relationships among fatigue parameters, monotonic ultimate tensile strength, and reduction of area are established. Three-dimensional elastic finite element (FE) analysis of a vortex reducer is carried out to obtain the data of stress and strain for predicting its life. The results show that there is a high-stress gradient at the edge of the air holes of the vortex reducer, and it is thus a dangerous point for fatigue crack initiation. The prediction result of the vortex reducer is more reasonable if the mean stress, the stress gradient, and the size effect are considered comprehensively. The developed life model can reflect the effects of many factors well, especially the stress concentration. The life of notched specimens predicted by this model give a high estimation precision, and the prediction life data mainly fall into the scatter band of factor 2.
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March 2019
Research-Article
Fatigue Life Prediction of Vortex Reducer Based on Stress Gradient
Yanbin Luo,
Yanbin Luo
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: luoyanbin1206@buaa.edu.cn
Beihang University,
Beijing 100083, China
e-mail: luoyanbin1206@buaa.edu.cn
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Yanrong Wang,
Yanrong Wang
Professor
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: yrwang@buaa.edu.cn
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: yrwang@buaa.edu.cn
Search for other works by this author on:
Bo Zhong,
Bo Zhong
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: zhongbobuaa@163.com
Beihang University,
Beijing 100083, China
e-mail: zhongbobuaa@163.com
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Jiazhe Zhao,
Jiazhe Zhao
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: zhaojiazhe@buaa.edu.cn
Beihang University,
Beijing 100083, China
e-mail: zhaojiazhe@buaa.edu.cn
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Xiaojie Zhang
Xiaojie Zhang
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: zxjbuaa@buaa.edu.cn
Beihang University,
Beijing 100083, China
e-mail: zxjbuaa@buaa.edu.cn
Search for other works by this author on:
Yanbin Luo
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: luoyanbin1206@buaa.edu.cn
Beihang University,
Beijing 100083, China
e-mail: luoyanbin1206@buaa.edu.cn
Yanrong Wang
Professor
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: yrwang@buaa.edu.cn
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: yrwang@buaa.edu.cn
Bo Zhong
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: zhongbobuaa@163.com
Beihang University,
Beijing 100083, China
e-mail: zhongbobuaa@163.com
Jiazhe Zhao
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: zhaojiazhe@buaa.edu.cn
Beihang University,
Beijing 100083, China
e-mail: zhaojiazhe@buaa.edu.cn
Xiaojie Zhang
School of Energy and Power Engineering,
Beihang University,
Beijing 100083, China
e-mail: zxjbuaa@buaa.edu.cn
Beihang University,
Beijing 100083, China
e-mail: zxjbuaa@buaa.edu.cn
1Corresponding author.
Contributed by the Design for Manufacturing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received June 28, 2018; final manuscript received December 1, 2018; published online January 10, 2019. Assoc. Editor: Paul Witherell.
J. Mech. Des. Mar 2019, 141(3): 031701 (10 pages)
Published Online: January 10, 2019
Article history
Received:
June 28, 2018
Revised:
December 1, 2018
Citation
Luo, Y., Wang, Y., Zhong, B., Zhao, J., and Zhang, X. (January 10, 2019). "Fatigue Life Prediction of Vortex Reducer Based on Stress Gradient." ASME. J. Mech. Des. March 2019; 141(3): 031701. https://doi.org/10.1115/1.4042189
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