Correlation of the deply technique with the ultrasonic imaging of impact damage in graphite/epoxy compositesA quantitative ultrasonic technique for the nondestructive assessment of impact damage is described. The method, which involves digitizing the entire backscattered ultrasonic wave from a sample, was applied to two test panels removed from a 16-ply graphite/epoxy laminate and impacted with an aluminum ball fired at a velocity of 150 ft/sec. The results of the ultrasonic NDE were compared with the results obtained using the destructive deply technique of Freeman (1984). The NDE method provides through-the-thickness information on damage and only requires access to a single side of the material, while the deply technique gives exact information on the actual damage. Good quantitative agreement between the two techniques was obtained.
Document ID
19870023489
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smith, B. T. (NASA Langley Research Center Hampton, VA, United States)
Heyman, J. S. (NASA Langley Research Center Hampton, VA, United States)
Moore, J. G. (NASA Langley Research Center Hampton, VA, United States)
Cucura, S. J. (NASA Langley Research Center Hampton, VA, United States)
Freeman, S. M. (Lockheed-Georgia Co. Marietta, United States)