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Effect of stress on energy flux deviation of ultrasonic waves in GR/EP compositesUltrasonic waves suffer energy flux deviation in graphite/epoxy because of the large anisotropy. The angle of deviation is a function of the elastic coefficients. For nonlinear solids, these coefficients and thus the angle of deviation is a function of stress. Acoustoelastic theory was used to model the effect of stress on flux deviation for unidirectional T300/5208 using previously measured elastic coefficients. Computations were made for uniaxial stress along the x3 axis (fiber axis) and the x1 for waves propagating in the x1x3 plane. These results predict a shift as large as three degrees for the quasi-transverse wave. The shift in energy flux offers a new nondestructive technique of evaluating stress in composites.
Document ID
19930068778
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Prosser, William H.
(NASA Langley Research Center Hampton, VA, United States)
Kriz, R. D.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, United States)
Fitting, Dale W.
(NIST Boulder, CO, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1990
Publication Information
Publisher: Institute of Electrical and Electronics Engineers
Subject Category
Composite Materials
Accession Number
93A52775
Distribution Limits
Public
Copyright
Other

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