Wire material /Inconel/ having high friction and low wear characteristics, reduces vibratory stress and prevents compressor blade failure

Johnson, R. L.

English

NASA Technical Reports Server

ow December 1966
	
Brief 66-10666 
NASA TECH BRIEF	
/& 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Wire Material Reduces Compressor Blade Vibration 
The problem: 
Compressor blade vibrations often severely limit 
the choice of design and operating conditions of 
"high-aspect-ratio" compressor blading. The use of 
titanium wires to friction-damp blade vibrations has 
generally been unsatisfactory due to wire galling and 
wear. 
The solution: 
A wire material (Inconel) having high friction and 
low wear characteristics, which reduces vibratory 
stress and prevents blade failure. 
How it's done: 
Two 1/16-inch  oxidized Inconel wires were in-
stalled on an experimental compressor to damp both 
bending and torsional vibrations. This damping re-
duced vibratory stress to about 1/20 of the undamped
stress and prevented failure. After nearly 10 hours 
of operation, no significant wear was observed on the 
blades and maximum wire wear of 0.0008 inch was 
noted. 
Note: 
Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B66-10666 
Patent status: 
No patent action is contemplated by NASA. 
Source: R. L. Johnson 
(Lewis-357) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000664 2020-03-11T17:41:22+00:00Z


Wire material reduces compressor blade vibration

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