1970-01-12

Boundary Layers and Their Relevance to Adhesive Joint Behavior 700067

A case is made for the consideration of the effects of boundary layers on the mechanical properties of composite structures such as adhesive joints. Because boundary layers do exist (for example, oxides on metals, transcrystallinity in certain polymers), it is not sufficient to consider that only surface chemical and bulk mechanical properties determine joint behavior. Several different kinds of boundary layers are shown to exist in polymeric materials and certain of their properties are described. Illustration of their relevance to adhesive joint behavior is given.

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