Wave Propagation and Acoustic Emission in Layered Composites
I will be presenting two different phases of our NDT composites program. The first of these, an in-house effort, is on the use of ultrasonic techniques, including spectrum analysis, for the nondestructive testing of composite materials. The second part of the presentation will be on characterization of acoustic emissions for boron/aluminum. This latter program is a joint effort between NADC and the University of Delaware. By way of background, Fig. 1 shows a diagram of an apparatus used for ultrasonic detection and mapping of flaws in composites. This is quite a conventional apparatus with the possible exception of the incorporation of the spectrum analysis capability.