Effects of geometric variables on rub characteristics of Ti-6A1-4V
Robert C. Bill, Jan Wolak, Donald W. Wisander, Propulsion Laboratory (U.S.), Lewis Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1981 - Science - 18 pages
Experiments simulating rub interactions between Ti-6Al-4V blade tips and various seal materials were conducted. The number of blade tips and the blade tip geometry were varied to determine their effects on rub forces and on wear phenomena. Contact was found to be quite unsteady for all blade tip geometries except for thos incorporating deliberately rounded blade tips. The unsteady contact was characterized by long periods of rubbing contact and increasing blade tip load that terminated in sudden rapid metal removal, sometimes accompanied by tearing and disruption of porous seal material under the rub surface. A model describing the blade tip loading is proposed and is based on the propagation of an elastic stress wave through the seal material as the seal material is dynamically compressed by the blade tip leading edge. (Author).
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10-blade-tip tests 21-percent-dense Hastelloy-X fibermetal aluminum-graphite blade contact blade pass blade tip leading-edge blade tip loading blade tip thickness Blade tip velocity cantilever load cell configuration contact geometry deliberately rounded blade dispersive X-ray analysis Energy dispersive X-ray equation friction torque frictional tearing gas-path seal material graphite Heavy transfer impulse step incursion depth incursion rate labyrinth seal leading-edge wear Lewis Research Center load cell cantilever load pattern m/sec measured at leading metal cutting micrometers millimeters Nichrome nickel-graphite number of blade peak load plasma-sprayed polyester radial frictional radius of curvature rotor rounded blade tips rounded tips rub behavior rub debris rub groove rub interaction seal material specimen shown in figure single blade tip sintered Hastelloy-X fibermetal slideway sliding direction smeared layer smeared rub surface Smeared with burnout standard blade tips thin blade tips Ti-6A1-4V blade tip tip and sintered tip leading edge tip wear unsteady various seal materials Wear debris Wpax