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The detection of bondline delaminations in multilayer structures using ultrasonic reflection techniques is a generic problem in adhesively bonded composite structures such as the Space Shuttle's Solid Rocket Motors (SRH). Standard pulse echo ultrasonic techniques do not perform well for a composite resonator composed of a resonant layer combined with attenuating layers. Excessive ringing in the resonant layer tends to mask internal echoes emanating from the attenuating layers. The SRM is made up of a resonant steel layer backed by layers of adhesive, rubber, liner, and fuel, which are ultrasonically attenuating. The structure's response is modeled as a lossy ultrasonic transmission line. The model predicts that the acoustic response of the system is sensitive to delaminations at the interior bondlines in a few narrow frequency bands. These predictions are verified by measurements on a fabricated system. Successful imaging of internal delaminations is sensitive to proper selection of the interrogating frequency. Images of fabricated bondline delaminations are presented based on these studies

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THIS volume is a companio)] t.o Volume 1, Fundamentals (AMR Review No. 1126, Apr. 1970) and will generally be used in conjunction with it for a course on plastic design. With some introductory coverage, it may suffice by itself for a more designoriented course. The book is in a clear, expository style with mall~' examples, the discllssion extrapolating beyond the ex