Non-Destructive Methods of Characterising the Strength of Adhesive-Bonded Joints - A Review

摘要

Progress in the use of adhesive bonded joints has been hampered by a lack of adequate non-destructive methods to check bond quality. This report describes briefly how this situation has arisen noting that, whilst many NDT methods give some measure of cohesive strength, it is adhesive strength that is of major concern. For joints with composite adherends it is concluded that it is surface contamination prior to bonding that must be sought, environmental degradation is not a major problem. With metallic adherends, however, the adhesive strength is strongly dependent on the detailed nature of the thin oxide layer and on the way in which this becomes hydrated causing environmental degradation. Ultrasonic methods are still considered to offer the best prospects and these are discussed in some detail. Keywords: Adhesive bonds, Bondex structures, Non destructive testing, Ultrasonic.