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Fretting Fatigue Crack Initiation Life Prediction Model in a Dovetail Joint of a Compressor

Badrikouhi, Ehsan | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56146 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Adibnazari, Saeed
  7. Abstract:
  8. Fretting fatigue is one of the main factors leading to failure in structures that have components temporarily connected to each other. The occurrence of fretting at the connection region of a structure under cyclic loading is inevitable, and only various methods can delay its occurrence or minimize the damage resulting from it. Fretting is dependent on various factors, and this has made previous studies unable to lead to a unified approach for predicting the fretting fatigue crack initiation life. In this thesis, after reviewing previous studies, a proving ring is designed for fretting fatigue testing. In the next step, fretting fatigue tests using the bridge-type method are performed on specimens made of titanium alloy (grade 5), and along with finite element simulation of the tests, the resulting damage from fretting on the surface of the specimens are investigated to find a suitable parameter for predicting the fretting fatigue crack initiation life. From the obtained results, a new parameter for predicting the fretting fatigue crack initiation life has been presented based on the contact parameters, which can be measured using computational methods. In the final section of this thesis, the quality of predicting the fretting fatigue life using this parameter is compared with existing conventional methods
  9. Keywords:
  10. Fatigue Life Reduction ; Fretting Fatigue ; Fatigue Crack ; Finite Element Simulation ; Contact Problem ; Compressor Blade ; Titanium Alloy

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