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Ultrasonic verification of five wave fronts in unidirectional graphite epoxy compositeThe existence of five different waves fronts in a unidirectional graphite fiber reinforced epoxy composite with energy flux propagation at the angle of 60 deg with respect to the fiber direction is verified by measuring their corresponding group and phase velocities of longitudinal and shear waves using the through transmission technique. The experimental and theoretical values of phase velocities show excellent agreement for all three modes of wave propagation. It is also verified that the maximum output voltage amplitude is obtained when the line joining the centers of the transmitting and receiving transducers is parallel to the energy propagation direction defined by the deviation angle.
Document ID
19900019542
Document Type
Contractor Report (CR)
Authors
Seng, Han-Song (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Williams, James H., Jr. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1990
Subject Category
QUALITY ASSURANCE AND RELIABILITY
Report/Patent Number
NASA-CR-185288
NAS 1.26:185288
Funding Number(s)
PROJECT: RTOP 505-90-01
CONTRACT_GRANT: NAG3-1105
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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