1 / 5

Wear of a Gas Turbine Friction Damper

Wear of a Gas Turbine Friction Damper. MANE-6960 Friction, Wear, and Lubrication of Materials. Overview. Wear of a dry friction damper in turbine section of engine investigated

bonner
Download Presentation

Wear of a Gas Turbine Friction Damper

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Wear of a Gas Turbine Friction Damper MANE-6960 Friction, Wear, and Lubrication of Materials

  2. Overview • Wear of a dry friction damper in turbine section of engine investigated • Blade excitation is one of many failure concerns due to risk of cyclic crack propagation from dynamic loading coupled with high thermal and static loading • Turbine blade vibration amplitude mitigated by use of under platform “cottage-roof” damper to dissipate kinetic energy by means of frictional contact and heat generation

  3. Theory and Methodology • Archard’s law for adhesive wear: • Relative tangential slip movement between damper wearing surface and blade counter surface on the order of 25 micrometers • Damper wear due to adhesion and fretting cannot be avoided, but mitigated with appropriate materials • Low change in damper volume is essential in retaining vibrational damping capability over the lifetime of the component

  4. Results • Various hardness values of high temperature alloys have an effect on damper wear rates • Nickel and Cobalt-Chromium alloy hardness can range from 165 BHN to 515 BHN in a high temperature environment • Surface modification by means of carburization can be an effective low cost solution over high bulk material hardness alloys

  5. Conclusion • Adhesive wear due to plastic deformation of asperity and bulk material cannot be avoided over high cyclic loading • Increasing material hardness retains damping capability of the part over lifetime of engine operation • Gas carburizing further improves part capability • Softer and lighter Ni alloy can behaves as high hardness Co-Cr alloy for most of part lifetime

More Related