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 configuration debris particles densification dispersive X-ray analysis Energy dispersive X-ray equation fibermetal seal friction torque frictional tearing gas-path seal material graphite impulse step incursion depth incursion rate labyrinth seal leading-edge wear load cell cantilever load pattern m/sec measured at leading metal cutting micrometers Nichrome nickel-graphite number of blade peak load plasma-sprayed polyester pyrometer radius of curvature rotor rounded blade tips rounded tips rub behavior rub debris rub groove rub interaction seal material sample seal material specimen shown in figure Simulated blade tip single blade single-blade-tip test sintered Hastelloy-X fibermetal slideway sliding direction smeared layer smeared rub surface Smeared with burnout Spherical debris standard blade tips standard-thickness blade tips temperature thin blade tips Ti-6A1-4V blade tip tip and sintered tip leading edge tip wear unsteady Wear debris