Nondestructive detection of weak joints in adhesively bonded composite structures

Some aspects of research and progress in adhesive bonding of composite structures are summarized with emphasis on defects, mechanisms, modeling, and nondestructive evaluation methods. The application of vibration damping and frequency measurements in nondestructive detection of degraded adhesive joints is emphasized. Unlike our previous reported research on void-degraded adhesively bonded composite models, this paper focuses on the composite structures with weak bonding defects.