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Development of basic theories and techniques for determining stresses in rotating turbine or compressor bladesA method for measuring in-plane displacement of a rotating structure by using two laser speckle photographs is described. From the displacement measurements one can calculate strains and stresses due to a centrifugal load. This technique involves making separate speckle photographs of a test model. One photograph is made with the model loaded (model is rotating); the second photograph is made with no load on the model (model is stationary). A sandwich is constructed from the two speckle photographs and data are recovered in a manner similar to that used with conventional speckle photography. The basic theory, experimental procedures of this method, and data analysis of a simple rotating specimen are described. In addition the measurement of in-plane surface displacement components of a deformed solid, and the application of the coupled laser speckle interferometry and boundary-integral solution technique to two dimensional elasticity problems are addressed.
Document ID
19800015825
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chien, C. H. (Alabama Univ. University, AL, United States)
Swinson, W. F. (Alabama Univ. University, AL, United States)
Turner, J. L. (Alabama Univ. University, AL, United States)
Moslehy, F. A. (Alabama Univ. University, AL, United States)
Ranson, W. F. (Alabama Univ. University, AL, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1980
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA-CR-163190
Accession Number
80N24317
Funding Number(s)
CONTRACT_GRANT: NSG-3233
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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