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A real-time acousto-ultrasonic (AU) nondestructive evaluation (NDE) technique was developed to study the damage mechanisms of unidirectional and cross-ply SiC/CAS ceramic composites. Real-time AU was found to be very sensitive in detecting the stress levels at which the onset of matrix cracking occurs and the stress level for saturation of matrix cracking. Real-time AU as developed and presented in this paper can continuously monitor damage under cyclic loads and hence enhance our understanding of damage mechanisms in ceramic composites.
ultrasonics, acousto-ultrasonics, AU, acoustic, real-time NDE, NDE, nondestructive test, ceramic composite, fatigue damage, damage modes, matrix cracking
Graduate assistant (currently research associate), Virginia Polytechnic Institute and State University, Blacksburg, VA
professor and department head, Virginia Polytechnic Institute and State University, Blacksburg, VA