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Analysis of Contact Geometry Effect on the Slip Amplitude in Fretting Fatigue of a Turbine Blade Root

Shirzadi, Saba | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50256 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Adibnazari, Saeed
  7. Abstract:
  8. Turbine blades are exposed to mechanical and thermal stresses due to their operation in critical conditions and get into various damages such as fatigue and wear. These factors reduce the life of the blades and lead to expensive maintenances. As a result, recognizing the type of possible damage helps to increase the life of the blade and to delay the occurrence of failures by taking the necessary actions.The subject of this thesis is to investigate the effect of geometric parameters on the slip amplitude in the root of a turbine blade. In this work, the effect of three parameters of contact area length, contact angle, and coefficient of friction on relative slip amplitude and contact pressure values by using a two-dimensional finite element model has been investigated .The results show that by increasing coefficient of friction, contact angle, and length of contact area, the slip amplitude and contact pressure values decrease. Increasing the angle of the contact area and the coefficient of friction also increase the separation area at the upper edge of the contact. While, the increase in the length of the contact area does not change the separation area near the upper edge of the contact. In this work, the effect of the three-dimensional field was also examined and it was found that if there is no twisting angle, the slip amplitude and contact pressure values are the same in the two-dimensional and three-dimensional model, and a two-dimensional model can be used to save time and cost
  9. Keywords:
  10. Fretting Fatigue ; Contact Stresses ; Turbine Blades ; Mechanical Stress ; Wear-out ; Frictional Contact ; Slip Amplitude

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