ABSTRACT
This chapter addresses the problem of how to inspect bonded assemblies so that all discrepancies are identified. When very large and costly assemblies have been bonded, the importance of good non-destructive inspections is fully appreciated. The chapter describes several techniques that can be used and presents drawbacks and limitations where they exist. Inspections of bonded assemblies are made immediately after the adhesive cure cycle, after the parts are cleaned up and removed from the manufacturing jigs or fixtures. The chapter specifically addresses the three acryonyms as they apply to adhesive-bonded joints within structures. The three acryonyms are Nondestructive Testing (NDT), Nondestructive Inspection (NDI), Nondestructive Evaluation (NDE). The NDT methods are used to test sandwich structures having aluminum or titanium skins and aluminum core. The NDT process specification must be submitted for approval by the government prior to bonded assembly production. Experience, confidence, and effectiveness of NDI technicians and engineering personnel are gained by correlating NDI results with destructive testing.
