ESTIMATION OF FRETTING WEAR IN DRY FRICTION DAMPERS USED IN BLADED DISKS UTILIZING MICRO-SLIP FRICTION MODEL

Date

2024-9-4

Author

Durmaz, Semih

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In bladed disk assemblies, dry friction dampers are employed to reduce the vibration levels at resonant frequencies. Dry friction dampers have good energy dissipation characteristics, but cause fretting wear during operation. The dynamic response of structures may change, resulting in different damping performances which can cause failure due to material removal from contacting surfaces. The nonlinear nature of dry friction makes the analysis of such systems rather complex. Macro-slip models are widely used for modelling friction contact interfaces due to its simplicity, and works well when there are no partial slip between contacting surfaces. If partial slip occurs, micro-slip models are required to obtain accurate response of the bladed disk assembly. In this research, bladed disk assemblies with shroud contact and underplatform dampers modelled with both macro-slip and micro-slip approaches are studied. Moreover, fretting wear due to friction contact in bladed disk assemblies modelled with micro-slip are examined. The change in dynamic response due to fretting wear of shrouded blades and blades with underplatform dampers are presented.

Subject Keywords

Nonlinear Vibration, Dry Friction Damping, Micro-slip, Fretting Wear

URI

https://hdl.handle.net/11511/111283

Collections

Graduate School of Natural and Applied Sciences, Thesis