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Why can the interphase be the location where an adhesive joint fails?
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adhesive
Overview of how glue and other adhesives work.
The interphase is a transitional zone that forms at the interface between an adhesive and the adherend. Within this region, the chemical and physical properties of the adhesive can differ significantly from those found in the bulk material.1
Because the interphase is responsible for transferring stress between the joined components, its composition is the primary factor controlling the overall strength and durability of the joint. Consequently, this region is frequently the site of environmental attack, which can degrade the bond and lead to joint failure.1