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Vibration Characteristics of Multi-Stage Blade–Disk–Shaft Integrated Structure with Three-Dimensional Crack

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Abstract

Purpose

According to the structural parameters of an actual turbofan aeroengine, the dynamics modeling and vibration analysis of multi-stage blade-disk-shaft integrated structure with three-dimensional crack are conducted.

Methods

Based on the theory of fracture mechanics, the stress intensity factor is considered as a fracture criterion. This paper proposes a three-dimensional (3-d) equivalent notch model which is simpler and more convenient than the traditional crack simulation model. Moreover, its validity is analyzed. Aiming at the harsh working environment of the blades, the penetration crack is considered at the edge and the middle of a blade root, respectively.

Results

The influence of the crack on the strength failure of the rotor system is studied. Results show that the appropriate small angle equivalent notch model can be convenient and effective to simulate the fracture cracks, in which 5° is proved to be the best angle.

Conclusions

The crack aggravates the vibration of blades obviously. A parametric study is conducted, with a particular focus on the effects of pressure load and centrifugal load on the stress intensity factors and displacement fields.

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Funding

This project is supported by the National Science Foundation of China (No. 51805076, No. U1708255 and No. 51775093), the Fundamental Research Funds for the Central Universities (No. N170503011) and the Natural Science Foundation of Liaoning Province, China (No. 20180551058).

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Authors and Affiliations

  1. School of Science, Northeastern University, Shenyang, China

    Zhao Tianyu, Zhang Hui & Yuan Huiqun

  2. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, China

    Zhao Tianyu

  3. School of Resources and Civil Engineering, Northeastern University, Shenyang, China

    Li Zhijun

  4. School of Mechanical Engineering, Yangzhou University, Yangzhou, China

    Kou Haijiang

Authors
  1. Li Zhijun
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  2. Zhao Tianyu
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  3. Kou Haijiang
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  4. Zhang Hui
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  5. Yuan Huiqun
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Corresponding authors

Correspondence to Zhao Tianyu or Kou Haijiang.

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The authors declare that they have no conflicts of interest to this work.

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Cite this article

Li, Z., Zhao, T., Kou, H. et al. Vibration Characteristics of Multi-Stage Blade–Disk–Shaft Integrated Structure with Three-Dimensional Crack. J. Vib. Eng. Technol. 9, 597–611 (2021). https://doi.org/10.1007/s42417-020-00251-0

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  • DOI: https://doi.org/10.1007/s42417-020-00251-0

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