A model for correlating damage and ultrasonic attenuation in compositesUltrasonic attenuation data measured by the pulse-echo technique have been obtained versus load for two graphite-epoxy laminates and are presented. The attenuation-load data display distinct changes at load values associated with the initiation of transverse cracks in the weakest plies and with the knee in the bilinear stress-strain curve. It was intended to determine if a simplified diffraction model could be used to account for the attenuation changes. The basis of the diffraction model is that transverse cracks or delaminations, or both, initiating and progressing in the specimen under the area covered by the ultrasonic transducer would cause diffraction of the ultrasonic beam and changes in the measured attenuation.
Document ID
19800036969
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hayford, D. T. (Battelle Columbus Laboratories Columbus, Ohio, United States)
Henneke, E. G., II (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)